Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

218 files changed, 19547 insertions, 0 deletions

diff --git a/dom/quota/test/browser/browser.toml b/dom/quota/test/browser/browser.toml
new file mode 100644
index 0000000000..ea43e97eba
--- /dev/null
+++ b/dom/quota/test/browser/browser.toml
@@ -0,0 +1,18 @@
+[DEFAULT]
+skip-if = ["buildapp != 'browser'"]
+support-files = [
+  "head.js",
+  "helpers.js",
+  "empty.html",
+  "permissionsPrompt.html",
+]
+
+["browser_permissionsCrossOrigin.js"]
+
+["browser_permissionsPromptAllow.js"]
+
+["browser_permissionsPromptDeny.js"]
+
+["browser_permissionsPromptUnknown.js"]
+
+["browser_simpledb.js"]
diff --git a/dom/quota/test/browser/browser_permissionsCrossOrigin.js b/dom/quota/test/browser/browser_permissionsCrossOrigin.js
new file mode 100644
index 0000000000..785897784c
--- /dev/null
+++ b/dom/quota/test/browser/browser_permissionsCrossOrigin.js
@@ -0,0 +1,55 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const emptyURL =
+  "https://example.com/browser/dom/quota/test/browser/empty.html";
+
+addTest(async function testNoPermissionPrompt() {
+  registerPopupEventHandler("popupshowing", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+
+  info("Creating tab");
+
+  await BrowserTestUtils.withNewTab(emptyURL, async function (browser) {
+    await new Promise(r => {
+      SpecialPowers.pushPrefEnv(
+        {
+          set: [
+            ["dom.security.featurePolicy.header.enabled", true],
+            ["dom.security.featurePolicy.webidl.enabled", true],
+          ],
+        },
+        r
+      );
+    });
+
+    await SpecialPowers.spawn(browser, [], async function (host0) {
+      let frame = content.document.createElement("iframe");
+      // Cross origin src
+      frame.src = "https://example.org/browser/dom/quota/test/empty.html";
+      content.document.body.appendChild(frame);
+      await ContentTaskUtils.waitForEvent(frame, "load");
+
+      await content.SpecialPowers.spawn(frame, [], async function () {
+        // Request a permission.
+        const persistAllowed = await this.content.navigator.storage.persist();
+        Assert.ok(
+          !persistAllowed,
+          "navigator.storage.persist() has been denied"
+        );
+      });
+      content.document.body.removeChild(frame);
+    });
+  });
+
+  unregisterAllPopupEventHandlers();
+});
diff --git a/dom/quota/test/browser/browser_permissionsPromptAllow.js b/dom/quota/test/browser/browser_permissionsPromptAllow.js
new file mode 100644
index 0000000000..06e928c40f
--- /dev/null
+++ b/dom/quota/test/browser/browser_permissionsPromptAllow.js
@@ -0,0 +1,66 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const testPageURL =
+  "https://example.com/browser/dom/quota/test/browser/permissionsPrompt.html";
+
+addTest(async function testPermissionAllow() {
+  removePermission(testPageURL, "persistent-storage");
+
+  registerPopupEventHandler("popupshowing", function () {
+    ok(true, "prompt showing");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(true, "prompt shown");
+    triggerMainCommand(this);
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(true, "prompt hidden");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(true, gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.ALLOW_ACTION,
+    "Correct permission set"
+  );
+  gBrowser.removeCurrentTab();
+  unregisterAllPopupEventHandlers();
+  // Keep persistent-storage permission for the next test.
+});
+
+addTest(async function testNoPermissionPrompt() {
+  registerPopupEventHandler("popupshowing", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(true, gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.ALLOW_ACTION,
+    "Correct permission set"
+  );
+  gBrowser.removeCurrentTab();
+  unregisterAllPopupEventHandlers();
+  removePermission(testPageURL, "persistent-storage");
+});
diff --git a/dom/quota/test/browser/browser_permissionsPromptDeny.js b/dom/quota/test/browser/browser_permissionsPromptDeny.js
new file mode 100644
index 0000000000..927cbdd074
--- /dev/null
+++ b/dom/quota/test/browser/browser_permissionsPromptDeny.js
@@ -0,0 +1,150 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const testPageURL =
+  "https://example.com/browser/dom/quota/test/browser/permissionsPrompt.html";
+
+addTest(async function testPermissionTemporaryDenied() {
+  registerPopupEventHandler("popupshowing", function () {
+    ok(true, "prompt showing");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(true, "prompt shown");
+    triggerSecondaryCommand(this);
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(true, "prompt hidden");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(false, gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.UNKNOWN_ACTION,
+    "Correct permission set"
+  );
+
+  let tempBlock = SitePermissions.getAllForBrowser(
+    gBrowser.selectedBrowser
+  ).find(
+    p =>
+      p.id == "persistent-storage" &&
+      p.state == SitePermissions.BLOCK &&
+      p.scope == SitePermissions.SCOPE_TEMPORARY
+  );
+  ok(tempBlock, "Should have a temporary block permission on active browser");
+
+  unregisterAllPopupEventHandlers();
+  gBrowser.removeCurrentTab();
+  removePermission(testPageURL, "persistent-storage");
+});
+
+addTest(async function testPermissionDenied() {
+  removePermission(testPageURL, "persistent-storage");
+
+  registerPopupEventHandler("popupshowing", function () {
+    ok(true, "prompt showing");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(true, "prompt shown");
+    triggerSecondaryCommand(this, /* remember = */ true);
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(true, "prompt hidden");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(false, gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.DENY_ACTION,
+    "Correct permission set"
+  );
+  unregisterAllPopupEventHandlers();
+  gBrowser.removeCurrentTab();
+  // Keep persistent-storage permission for the next test.
+});
+
+addTest(async function testNoPermissionPrompt() {
+  registerPopupEventHandler("popupshowing", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(false, "Shouldn't show a popup this time");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(false, gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.DENY_ACTION,
+    "Correct permission set"
+  );
+  unregisterAllPopupEventHandlers();
+  gBrowser.removeCurrentTab();
+  removePermission(testPageURL, "persistent-storage");
+});
+
+addTest(async function testPermissionDeniedDismiss() {
+  registerPopupEventHandler("popupshowing", function () {
+    ok(true, "prompt showing");
+  });
+  registerPopupEventHandler("popupshown", function () {
+    ok(true, "prompt shown");
+    // Dismiss permission prompt.
+    dismissNotification(this);
+  });
+  registerPopupEventHandler("popuphidden", function () {
+    ok(true, "prompt hidden");
+  });
+
+  info("Creating tab");
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(gBrowser.selectedBrowser, testPageURL);
+  await waitForMessage(false, gBrowser);
+
+  // Pressing ESC results in a temporary block permission on the browser object.
+  // So the global permission for the URL should still be unknown, but the browser
+  // should have a block permission with a temporary scope.
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.UNKNOWN_ACTION,
+    "Correct permission set"
+  );
+
+  let tempBlock = SitePermissions.getAllForBrowser(
+    gBrowser.selectedBrowser
+  ).find(
+    p =>
+      p.id == "persistent-storage" &&
+      p.state == SitePermissions.BLOCK &&
+      p.scope == SitePermissions.SCOPE_TEMPORARY
+  );
+  ok(tempBlock, "Should have a temporary block permission on active browser");
+
+  unregisterAllPopupEventHandlers();
+  gBrowser.removeCurrentTab();
+  removePermission(testPageURL, "persistent-storage");
+});
diff --git a/dom/quota/test/browser/browser_permissionsPromptUnknown.js b/dom/quota/test/browser/browser_permissionsPromptUnknown.js
new file mode 100644
index 0000000000..8b1be6d65d
--- /dev/null
+++ b/dom/quota/test/browser/browser_permissionsPromptUnknown.js
@@ -0,0 +1,56 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const testPageURL =
+  "https://example.com/browser/dom/quota/test/browser/permissionsPrompt.html";
+
+addTest(async function testPermissionUnknownInPrivateWindow() {
+  removePermission(testPageURL, "persistent-storage");
+  info("Creating private window");
+  let win = await BrowserTestUtils.openNewBrowserWindow({ private: true });
+
+  registerPopupEventHandler(
+    "popupshowing",
+    function () {
+      ok(false, "Shouldn't show a popup this time");
+    },
+    win
+  );
+  registerPopupEventHandler(
+    "popupshown",
+    function () {
+      ok(false, "Shouldn't show a popup this time");
+    },
+    win
+  );
+  registerPopupEventHandler(
+    "popuphidden",
+    function () {
+      ok(false, "Shouldn't show a popup this time");
+    },
+    win
+  );
+
+  info("Creating private tab");
+  win.gBrowser.selectedTab = BrowserTestUtils.addTab(win.gBrowser);
+
+  info("Loading test page: " + testPageURL);
+  BrowserTestUtils.startLoadingURIString(
+    win.gBrowser.selectedBrowser,
+    testPageURL
+  );
+  await waitForMessage(false, win.gBrowser);
+
+  is(
+    getPermission(testPageURL, "persistent-storage"),
+    Ci.nsIPermissionManager.UNKNOWN_ACTION,
+    "Correct permission set"
+  );
+  unregisterAllPopupEventHandlers(win);
+  win.gBrowser.removeCurrentTab();
+  await BrowserTestUtils.closeWindow(win);
+  win = null;
+  removePermission(testPageURL, "persistent-storage");
+});
diff --git a/dom/quota/test/browser/browser_simpledb.js b/dom/quota/test/browser/browser_simpledb.js
new file mode 100644
index 0000000000..9cf4261332
--- /dev/null
+++ b/dom/quota/test/browser/browser_simpledb.js
@@ -0,0 +1,55 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// getRandomBuffer, compareBuffers
+loadScript("dom/quota/test/common/file.js");
+
+addTest(async function testSimpleDB() {
+  const name = "data";
+  const bufferSize = 100;
+
+  let database = getSimpleDatabase();
+
+  let request = database.open("data");
+  await requestFinished(request);
+
+  let buffer1 = getRandomBuffer(bufferSize);
+
+  request = database.write(buffer1);
+  await requestFinished(request);
+
+  request = database.seek(0);
+  await requestFinished(request);
+
+  request = database.read(bufferSize);
+  let result = await requestFinished(request);
+
+  let buffer2 = result.getAsArrayBuffer();
+
+  ok(compareBuffers(buffer1, buffer2), "Buffers equal.");
+
+  let database2 = getSimpleDatabase();
+
+  try {
+    request = database2.open(name);
+    await requestFinished(request);
+    ok(false, "Should have thrown!");
+  } catch (ex) {
+    Assert.equal(
+      request.resultCode,
+      NS_ERROR_STORAGE_BUSY,
+      "Good result code."
+    );
+  }
+
+  request = database.close();
+  await requestFinished(request);
+
+  request = database2.open(name);
+  await requestFinished(request);
+
+  request = database2.close();
+  await requestFinished(request);
+});
diff --git a/dom/quota/test/browser/empty.html b/dom/quota/test/browser/empty.html
new file mode 100644
index 0000000000..1ad28bb1f7
--- /dev/null
+++ b/dom/quota/test/browser/empty.html
@@ -0,0 +1,8 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Empty file</title>
+</head>
+<body>
+</body>
+</html>
diff --git a/dom/quota/test/browser/head.js b/dom/quota/test/browser/head.js
new file mode 100644
index 0000000000..38b2e82cf0
--- /dev/null
+++ b/dom/quota/test/browser/head.js
@@ -0,0 +1,149 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../";
+
+var gActiveListeners = {};
+
+loadScript("dom/quota/test/common/browser.js");
+
+function loadScript(path) {
+  const url = new URL(depth + path, gTestPath);
+  Services.scriptloader.loadSubScript(url.href, this);
+}
+
+// These event (un)registration handlers only work for one window, DONOT use
+// them with multiple windows.
+
+function registerPopupEventHandler(eventName, callback, win) {
+  if (!win) {
+    win = window;
+  }
+  gActiveListeners[eventName] = function (event) {
+    if (event.target != win.PopupNotifications.panel) {
+      return;
+    }
+    win.PopupNotifications.panel.removeEventListener(
+      eventName,
+      gActiveListeners[eventName]
+    );
+    delete gActiveListeners[eventName];
+
+    callback.call(win.PopupNotifications.panel);
+  };
+  win.PopupNotifications.panel.addEventListener(
+    eventName,
+    gActiveListeners[eventName]
+  );
+}
+
+function unregisterAllPopupEventHandlers(win) {
+  if (!win) {
+    win = window;
+  }
+  for (let eventName in gActiveListeners) {
+    win.PopupNotifications.panel.removeEventListener(
+      eventName,
+      gActiveListeners[eventName]
+    );
+  }
+  gActiveListeners = {};
+}
+
+function triggerMainCommand(popup, win) {
+  if (!win) {
+    win = window;
+  }
+  info("triggering main command");
+  let notifications = popup.childNodes;
+  ok(notifications.length, "at least one notification displayed");
+  let notification = notifications[0];
+  info("triggering command: " + notification.getAttribute("buttonlabel"));
+
+  EventUtils.synthesizeMouseAtCenter(notification.button, {}, win);
+}
+
+async function triggerSecondaryCommand(popup, remember = false, win = window) {
+  info("triggering secondary command");
+  let notifications = popup.childNodes;
+  ok(notifications.length, "at least one notification displayed");
+  let notification = notifications[0];
+
+  if (remember) {
+    notification.checkbox.checked = true;
+  }
+
+  await EventUtils.synthesizeMouseAtCenter(
+    notification.secondaryButton,
+    {},
+    win
+  );
+}
+
+function dismissNotification(popup, win = window) {
+  info("dismissing notification");
+  executeSoon(function () {
+    EventUtils.synthesizeKey("VK_ESCAPE", {}, win);
+  });
+}
+
+function waitForMessage(aMessage, browser) {
+  // We cannot capture aMessage inside the checkFn, so we override the
+  // checkFn.toSource to tunnel aMessage instead.
+  let checkFn = function () {};
+  checkFn.toSource = function () {
+    return `function checkFn(event) {
+      let message = ${aMessage.toSource()};
+      if (event.data == message) {
+        return true;
+      }
+      throw new Error(
+       \`Unexpected result: \$\{event.data\}, expected \$\{message\}\`
+      );
+    }`;
+  };
+
+  return BrowserTestUtils.waitForContentEvent(
+    browser.selectedBrowser,
+    "message",
+    /* capture */ true,
+    checkFn,
+    /* wantsUntrusted */ true
+  ).then(() => {
+    // An assertion in checkFn wouldn't be recorded as part of the test, so we
+    // use this assertion to confirm that we've successfully received the
+    // message (we'll only reach this point if that's the case).
+    ok(true, "Received message: " + aMessage);
+  });
+}
+
+function removePermission(url, permission) {
+  let uri = Cc["@mozilla.org/network/io-service;1"]
+    .getService(Ci.nsIIOService)
+    .newURI(url);
+  let ssm = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(
+    Ci.nsIScriptSecurityManager
+  );
+  let principal = ssm.createContentPrincipal(uri, {});
+
+  Cc["@mozilla.org/permissionmanager;1"]
+    .getService(Ci.nsIPermissionManager)
+    .removeFromPrincipal(principal, permission);
+}
+
+function getPermission(url, permission) {
+  let uri = Cc["@mozilla.org/network/io-service;1"]
+    .getService(Ci.nsIIOService)
+    .newURI(url);
+  let ssm = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(
+    Ci.nsIScriptSecurityManager
+  );
+  let principal = ssm.createContentPrincipal(uri, {});
+
+  return Cc["@mozilla.org/permissionmanager;1"]
+    .getService(Ci.nsIPermissionManager)
+    .testPermissionFromPrincipal(principal, permission);
+}
diff --git a/dom/quota/test/browser/helpers.js b/dom/quota/test/browser/helpers.js
new file mode 100644
index 0000000000..f3bbb36b71
--- /dev/null
+++ b/dom/quota/test/browser/helpers.js
@@ -0,0 +1,46 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../";
+
+var testGenerator;
+var testResult;
+
+loadScript("dom/quota/test/common/nestedtest.js");
+
+function loadScript(path) {
+  const url = new URL(depth + path, window.location.href);
+  SpecialPowers.Services.scriptloader.loadSubScript(url.href, this);
+}
+
+function runTest() {
+  clearAllDatabases(() => {
+    testGenerator = testSteps();
+    testGenerator.next();
+  });
+}
+
+function finishTestNow() {
+  if (testGenerator) {
+    testGenerator.return();
+    testGenerator = undefined;
+  }
+}
+
+function finishTest() {
+  clearAllDatabases(() => {
+    setTimeout(finishTestNow, 0);
+    setTimeout(() => {
+      window.parent.postMessage(testResult, "*");
+    }, 0);
+  });
+}
+
+function continueToNextStep() {
+  setTimeout(() => {
+    testGenerator.next();
+  }, 0);
+}
diff --git a/dom/quota/test/browser/permissionsPrompt.html b/dom/quota/test/browser/permissionsPrompt.html
new file mode 100644
index 0000000000..5f11bf6c95
--- /dev/null
+++ b/dom/quota/test/browser/permissionsPrompt.html
@@ -0,0 +1,34 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+  <head>
+    <meta charset=UTF-8>
+    <title>Persistent-Storage Permission Prompt Test</title>
+
+    <script type="text/javascript" src="helpers.js"></script>
+
+    <script type="text/javascript">
+      function* testSteps()
+      {
+        SpecialPowers.pushPrefEnv({
+          "set": [["dom.storageManager.prompt.testing", false],
+                  ["dom.storageManager.prompt.testing.allow", false]]
+        }, continueToNextStep);
+        yield undefined;
+
+        navigator.storage.persist().then(result => {
+          testGenerator.next(result);
+        });
+        testResult = yield undefined;
+
+        finishTest();
+      }
+    </script>
+
+  </head>
+
+  <body onload="runTest();" onunload="finishTestNow();"></body>
+
+</html>
diff --git a/dom/quota/test/common/browser.js b/dom/quota/test/common/browser.js
new file mode 100644
index 0000000000..5d9abd79e3
--- /dev/null
+++ b/dom/quota/test/common/browser.js
@@ -0,0 +1,33 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/system.js");
+
+function addTest(testFunction) {
+  const taskFunction = async function () {
+    await enableStorageTesting();
+
+    await testFunction();
+  };
+
+  Object.defineProperty(taskFunction, "name", {
+    value: testFunction.name,
+    writable: false,
+  });
+
+  add_task(taskFunction);
+}
+
+async function enableStorageTesting() {
+  const prefsToSet = [
+    ["dom.quotaManager.testing", true],
+    ["dom.simpleDB.enabled", true],
+  ];
+  if (Services.appinfo.OS === "WINNT") {
+    prefsToSet.push(["dom.quotaManager.useDOSDevicePathSyntax", true]);
+  }
+
+  await SpecialPowers.pushPrefEnv({ set: prefsToSet });
+}
diff --git a/dom/quota/test/common/content.js b/dom/quota/test/common/content.js
new file mode 100644
index 0000000000..51c9d3d68d
--- /dev/null
+++ b/dom/quota/test/common/content.js
@@ -0,0 +1,62 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const NS_ERROR_STORAGE_BUSY = SpecialPowers.Cr.NS_ERROR_STORAGE_BUSY;
+
+loadScript("dom/quota/test/common/global.js");
+
+function clearAllDatabases(callback) {
+  let qms = SpecialPowers.Services.qms;
+  let principal = SpecialPowers.wrap(document).nodePrincipal;
+  let request = qms.clearStoragesForPrincipal(principal);
+  let cb = SpecialPowers.wrapCallback(callback);
+  request.callback = cb;
+  return request;
+}
+
+// SimpleDB connections and SpecialPowers wrapping:
+//
+// SpecialPowers provides a SpecialPowersHandler Proxy mechanism that lets our
+// content-privileged code borrow its chrome-privileged principal to access
+// things we shouldn't be able to access.  The proxies wrap their returned
+// values, so once we have something wrapped we can rely on returned objects
+// being wrapped as well.  The proxy will also automatically unwrap wrapped
+// arguments we pass in.  However, we need to invoke wrapCallback on callback
+// functions so that the arguments they receive will be wrapped because the
+// proxy does not automatically wrap content-privileged functions.
+//
+// Our use of (wrapped) SpecialPowers.Cc results in getSimpleDatabase()
+// producing a wrapped nsISDBConnection instance.  The nsISDBResult instances
+// exposed on the (wrapped) nsISDBRequest are also wrapped.
+// In particular, the wrapper takes responsibility for automatically cloning
+// the ArrayBuffer returned by nsISDBResult.getAsArrayBuffer into the content
+// compartment (rather than wrapping it) so that constructing a Uint8Array
+// from it will succeed.
+
+function getSimpleDatabase() {
+  let connection = SpecialPowers.Cc[
+    "@mozilla.org/dom/sdb-connection;1"
+  ].createInstance(SpecialPowers.Ci.nsISDBConnection);
+
+  let principal = SpecialPowers.wrap(document).nodePrincipal;
+
+  connection.init(principal);
+
+  return connection;
+}
+
+async function requestFinished(request) {
+  await new Promise(function (resolve) {
+    request.callback = SpecialPowers.wrapCallback(function () {
+      resolve();
+    });
+  });
+
+  if (request.resultCode != SpecialPowers.Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
diff --git a/dom/quota/test/common/file.js b/dom/quota/test/common/file.js
new file mode 100644
index 0000000000..55e2e189fb
--- /dev/null
+++ b/dom/quota/test/common/file.js
@@ -0,0 +1,45 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function getBuffer(size) {
+  let buffer = new ArrayBuffer(size);
+  is(buffer.byteLength, size, "Correct byte length");
+  return buffer;
+}
+
+// May be called for any size, but you should call getBuffer() if you know
+// that size is big and that randomness is not necessary because it is
+// noticeably faster.
+function getRandomBuffer(size) {
+  let buffer = getBuffer(size);
+  let view = new Uint8Array(buffer);
+  for (let i = 0; i < size; i++) {
+    view[i] = parseInt(Math.random() * 255);
+  }
+  return buffer;
+}
+
+function compareBuffers(buffer1, buffer2) {
+  if (buffer1.byteLength != buffer2.byteLength) {
+    return false;
+  }
+
+  let view1 = buffer1 instanceof Uint8Array ? buffer1 : new Uint8Array(buffer1);
+  let view2 = buffer2 instanceof Uint8Array ? buffer2 : new Uint8Array(buffer2);
+  for (let i = 0; i < buffer1.byteLength; i++) {
+    if (view1[i] != view2[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function getBlob(type, object) {
+  return new Blob([object], { type });
+}
+
+function getNullBlob(size) {
+  return getBlob("binary/null", getBuffer(size));
+}
diff --git a/dom/quota/test/common/global.js b/dom/quota/test/common/global.js
new file mode 100644
index 0000000000..cc7d9d97a2
--- /dev/null
+++ b/dom/quota/test/common/global.js
@@ -0,0 +1,47 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const INT64_MIN = -0x8000000000000000n;
+
+class RequestError extends Error {
+  constructor(resultCode, resultName) {
+    super(`Request failed (code: ${resultCode}, name: ${resultName})`);
+    this.name = "RequestError";
+    this.resultCode = resultCode;
+    this.resultName = resultName;
+  }
+}
+
+function openDBRequestUpgradeNeeded(request) {
+  return new Promise(function (resolve, reject) {
+    request.onerror = function (event) {
+      ok(false, "indexedDB error, '" + event.target.error.name + "'");
+      reject(event);
+    };
+    request.onupgradeneeded = function (event) {
+      resolve(event);
+    };
+    request.onsuccess = function (event) {
+      ok(false, "Got success, but did not expect it!");
+      reject(event);
+    };
+  });
+}
+
+function openDBRequestSucceeded(request) {
+  return new Promise(function (resolve, reject) {
+    request.onerror = function (event) {
+      ok(false, "indexedDB error, '" + event.target.error.name + "'");
+      reject(event);
+    };
+    request.onupgradeneeded = function (event) {
+      ok(false, "Got upgrade, but did not expect it!");
+      reject(event);
+    };
+    request.onsuccess = function (event) {
+      resolve(event);
+    };
+  });
+}
diff --git a/dom/quota/test/common/mochitest.js b/dom/quota/test/common/mochitest.js
new file mode 100644
index 0000000000..4bcfcf1138
--- /dev/null
+++ b/dom/quota/test/common/mochitest.js
@@ -0,0 +1,18 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/content.js");
+
+async function enableStorageTesting() {
+  let prefsToSet = [
+    ["dom.quotaManager.testing", true],
+    ["dom.simpleDB.enabled", true],
+  ];
+  if (SpecialPowers.Services.appinfo.OS === "WINNT") {
+    prefsToSet.push(["dom.quotaManager.useDOSDevicePathSyntax", true]);
+  }
+
+  await SpecialPowers.pushPrefEnv({ set: prefsToSet });
+}
diff --git a/dom/quota/test/common/nestedtest.js b/dom/quota/test/common/nestedtest.js
new file mode 100644
index 0000000000..5c2011bfe9
--- /dev/null
+++ b/dom/quota/test/common/nestedtest.js
@@ -0,0 +1,6 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/content.js");
diff --git a/dom/quota/test/common/system.js b/dom/quota/test/common/system.js
new file mode 100644
index 0000000000..b01bb8d1fa
--- /dev/null
+++ b/dom/quota/test/common/system.js
@@ -0,0 +1,74 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const PR_USEC_PER_SEC = 1000000;
+
+const NS_ERROR_STORAGE_BUSY = Cr.NS_ERROR_STORAGE_BUSY;
+
+loadScript("dom/quota/test/common/global.js");
+
+function getProfileDir() {
+  return Services.dirsvc.get("ProfD", Ci.nsIFile);
+}
+
+// Given a "/"-delimited path relative to a base file (or the profile
+// directory if a base file is not provided) return an nsIFile representing the
+// path.  This does not test for the existence of the file or parent
+// directories.  It is safe even on Windows where the directory separator is
+// not "/", but make sure you're not passing in a "\"-delimited path.
+function getRelativeFile(relativePath, baseFile) {
+  if (!baseFile) {
+    baseFile = getProfileDir();
+  }
+
+  let file = baseFile.clone();
+
+  if (Services.appinfo.OS === "WINNT") {
+    let winFile = file.QueryInterface(Ci.nsILocalFileWin);
+    winFile.useDOSDevicePathSyntax = true;
+  }
+
+  relativePath.split("/").forEach(function (component) {
+    if (component == "..") {
+      file = file.parent;
+    } else {
+      file.append(component);
+    }
+  });
+
+  return file;
+}
+
+function getCurrentPrincipal() {
+  return Cc["@mozilla.org/systemprincipal;1"].createInstance(Ci.nsIPrincipal);
+}
+
+function getSimpleDatabase(principal, persistence) {
+  let connection = Cc["@mozilla.org/dom/sdb-connection;1"].createInstance(
+    Ci.nsISDBConnection
+  );
+
+  if (!principal) {
+    principal = getCurrentPrincipal();
+  }
+
+  connection.init(principal, persistence);
+
+  return connection;
+}
+
+async function requestFinished(request) {
+  await new Promise(function (resolve) {
+    request.callback = function () {
+      resolve();
+    };
+  });
+
+  if (request.resultCode !== Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
diff --git a/dom/quota/test/common/test_simpledb.js b/dom/quota/test/common/test_simpledb.js
new file mode 100644
index 0000000000..dee7019097
--- /dev/null
+++ b/dom/quota/test/common/test_simpledb.js
@@ -0,0 +1,50 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+async function testSteps() {
+  const name = "data";
+  const bufferSize = 100;
+
+  let database = getSimpleDatabase();
+
+  let request = database.open(name);
+  await requestFinished(request);
+
+  let buffer1 = getRandomBuffer(bufferSize);
+
+  request = database.write(buffer1);
+  await requestFinished(request);
+
+  request = database.seek(0);
+  await requestFinished(request);
+
+  request = database.read(bufferSize);
+  let result = await requestFinished(request);
+
+  let buffer2 = result.getAsArrayBuffer();
+
+  ok(compareBuffers(buffer1, buffer2), "Buffers equal.");
+
+  let database2 = getSimpleDatabase();
+
+  try {
+    request = database2.open(name);
+    await requestFinished(request);
+    ok(false, "Should have thrown!");
+  } catch (ex) {
+    ok(request.resultCode == NS_ERROR_STORAGE_BUSY, "Good result code.");
+  }
+
+  request = database.close();
+  await requestFinished(request);
+
+  request = database2.open(name);
+  await requestFinished(request);
+
+  request = database2.close();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/common/test_storage_manager_persist_allow.js b/dom/quota/test/common/test_storage_manager_persist_allow.js
new file mode 100644
index 0000000000..0a6e59843d
--- /dev/null
+++ b/dom/quota/test/common/test_storage_manager_persist_allow.js
@@ -0,0 +1,30 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [["dom.storageManager.prompt.testing.allow", true]],
+    },
+    continueToNextStep
+  );
+  yield undefined;
+
+  navigator.storage.persist().then(grabArgAndContinueHandler);
+  let persistResult = yield undefined;
+
+  is(persistResult, true, "Persist succeeded");
+
+  navigator.storage.persisted().then(grabArgAndContinueHandler);
+  let persistedResult = yield undefined;
+
+  is(
+    persistResult,
+    persistedResult,
+    "Persist/persisted results are consistent"
+  );
+
+  finishTest();
+}
diff --git a/dom/quota/test/common/test_storage_manager_persist_deny.js b/dom/quota/test/common/test_storage_manager_persist_deny.js
new file mode 100644
index 0000000000..855d739ca3
--- /dev/null
+++ b/dom/quota/test/common/test_storage_manager_persist_deny.js
@@ -0,0 +1,34 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [["dom.storageManager.prompt.testing.allow", false]],
+    },
+    continueToNextStep
+  );
+  yield undefined;
+
+  navigator.storage.persist().then(grabArgAndContinueHandler);
+  let persistResult = yield undefined;
+
+  is(
+    persistResult,
+    false,
+    "Cancel the persist prompt and resolve a promise with false"
+  );
+
+  navigator.storage.persisted().then(grabArgAndContinueHandler);
+  let persistedResult = yield undefined;
+
+  is(
+    persistResult,
+    persistedResult,
+    "Persist/persisted results are consistent"
+  );
+
+  finishTest();
+}
diff --git a/dom/quota/test/common/test_storage_manager_persisted.js b/dom/quota/test/common/test_storage_manager_persisted.js
new file mode 100644
index 0000000000..ebda93649a
--- /dev/null
+++ b/dom/quota/test/common/test_storage_manager_persisted.js
@@ -0,0 +1,13 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  navigator.storage.persisted().then(grabArgAndContinueHandler);
+  let persistedResult = yield undefined;
+
+  is(persistedResult, false, "Persisted returns false");
+
+  finishTest();
+}
diff --git a/dom/quota/test/common/xpcshell.js b/dom/quota/test/common/xpcshell.js
new file mode 100644
index 0000000000..d0c5d78491
--- /dev/null
+++ b/dom/quota/test/common/xpcshell.js
@@ -0,0 +1,89 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/system.js");
+
+function enableStorageTesting() {
+  Services.prefs.setBoolPref("dom.quotaManager.testing", true);
+  Services.prefs.setBoolPref("dom.simpleDB.enabled", true);
+  if (Services.appinfo.OS === "WINNT") {
+    Services.prefs.setBoolPref("dom.quotaManager.useDOSDevicePathSyntax", true);
+  }
+}
+
+function resetStorageTesting() {
+  Services.prefs.clearUserPref("dom.quotaManager.testing");
+  Services.prefs.clearUserPref("dom.simpleDB.enabled");
+  if (Services.appinfo.OS === "WINNT") {
+    Services.prefs.clearUserPref("dom.quotaManager.useDOSDevicePathSyntax");
+  }
+}
+
+function clear(callback) {
+  let request = Services.qms.clear();
+  request.callback = callback;
+
+  return request;
+}
+
+function reset(callback) {
+  let request = Services.qms.reset();
+  request.callback = callback;
+
+  return request;
+}
+
+function installPackage(packageRelativePath, allowFileOverwrites) {
+  let currentDir = Services.dirsvc.get("CurWorkD", Ci.nsIFile);
+
+  let packageFile = getRelativeFile(packageRelativePath + ".zip", currentDir);
+
+  let zipReader = Cc["@mozilla.org/libjar/zip-reader;1"].createInstance(
+    Ci.nsIZipReader
+  );
+  zipReader.open(packageFile);
+
+  let entryNames = Array.from(zipReader.findEntries(null));
+  entryNames.sort();
+
+  for (let entryName of entryNames) {
+    if (entryName.match(/^create_db\.(html|js)/)) {
+      continue;
+    }
+
+    let zipentry = zipReader.getEntry(entryName);
+
+    let file = getRelativeFile(entryName);
+
+    if (zipentry.isDirectory) {
+      if (!file.exists()) {
+        file.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+      }
+    } else {
+      if (!allowFileOverwrites && file.exists()) {
+        throw new Error("File already exists!");
+      }
+
+      let istream = zipReader.getInputStream(entryName);
+
+      var ostream = Cc[
+        "@mozilla.org/network/file-output-stream;1"
+      ].createInstance(Ci.nsIFileOutputStream);
+      ostream.init(file, -1, parseInt("0644", 8), 0);
+
+      let bostream = Cc[
+        "@mozilla.org/network/buffered-output-stream;1"
+      ].createInstance(Ci.nsIBufferedOutputStream);
+      bostream.init(ostream, 32768);
+
+      bostream.writeFrom(istream, istream.available());
+
+      istream.close();
+      bostream.close();
+    }
+  }
+
+  zipReader.close();
+}
diff --git a/dom/quota/test/gtest/Common.cpp b/dom/quota/test/gtest/Common.cpp
new file mode 100644
index 0000000000..efbfd94775
--- /dev/null
+++ b/dom/quota/test/gtest/Common.cpp
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Common.h"
+
+#include "mozilla/dom/QMResult.h"
+
+namespace mozilla::dom::quota {
+
+#ifdef QM_ERROR_STACKS_ENABLED
+uint64_t DOM_Quota_Test::sExpectedStackId;
+
+// static
+void DOM_Quota_Test::SetUpTestCase() {
+  sExpectedStackId = QMResult().StackId();
+}
+
+// static
+void DOM_Quota_Test::IncreaseExpectedStackId() { sExpectedStackId++; }
+
+// static
+uint64_t DOM_Quota_Test::ExpectedStackId() { return sExpectedStackId; }
+#endif
+
+}  // namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/Common.h b/dom/quota/test/gtest/Common.h
new file mode 100644
index 0000000000..eac58bd7fb
--- /dev/null
+++ b/dom/quota/test/gtest/Common.h
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_QUOTA_TEST_GTEST_COMMON_H_
+#define DOM_QUOTA_TEST_GTEST_COMMON_H_
+
+#include <cstdint>
+#include "gtest/gtest.h"
+#include "mozilla/dom/quota/Config.h"
+
+namespace mozilla::dom::quota {
+
+class DOM_Quota_Test : public testing::Test {
+#ifdef QM_ERROR_STACKS_ENABLED
+ public:
+  static void SetUpTestCase();
+
+  static void IncreaseExpectedStackId();
+
+  static uint64_t ExpectedStackId();
+
+ private:
+  static uint64_t sExpectedStackId;
+#endif
+};
+
+}  // namespace mozilla::dom::quota
+
+#endif  // DOM_QUOTA_TEST_GTEST_COMMON_H_
diff --git a/dom/quota/test/gtest/PQuotaTest.ipdl b/dom/quota/test/gtest/PQuotaTest.ipdl
new file mode 100644
index 0000000000..3ea2d0c3f9
--- /dev/null
+++ b/dom/quota/test/gtest/PQuotaTest.ipdl
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace mozilla {
+namespace dom {
+namespace quota {
+
+[ParentProc=any, ChildProc=any]
+sync protocol PQuotaTest {
+ parent:
+  sync Try_Success_CustomErr_QmIpcFail()
+    returns (bool tryDidNotReturn);
+
+  sync Try_Success_CustomErr_IpcFail()
+    returns (bool tryDidNotReturn);
+
+  sync TryInspect_Success_CustomErr_QmIpcFail()
+    returns (bool tryDidNotReturn);
+
+  sync TryInspect_Success_CustomErr_IpcFail()
+    returns (bool tryDidNotReturn);
+};
+
+} // namespace quota
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/quota/test/gtest/QuotaManagerDependencyFixture.cpp b/dom/quota/test/gtest/QuotaManagerDependencyFixture.cpp
new file mode 100644
index 0000000000..2d3fe17705
--- /dev/null
+++ b/dom/quota/test/gtest/QuotaManagerDependencyFixture.cpp
@@ -0,0 +1,263 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "QuotaManagerDependencyFixture.h"
+
+#include "mozIStorageService.h"
+#include "mozStorageCID.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/quota/QuotaManagerService.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "nsIQuotaCallbacks.h"
+#include "nsIQuotaRequests.h"
+#include "nsIVariant.h"
+#include "nsScriptSecurityManager.h"
+
+namespace mozilla::dom::quota::test {
+
+namespace {
+
+class RequestResolver final : public nsIQuotaCallback {
+ public:
+  RequestResolver() : mDone(false) {}
+
+  bool Done() const { return mDone; }
+
+  NS_DECL_ISUPPORTS
+
+  NS_IMETHOD OnComplete(nsIQuotaRequest* aRequest) override {
+    mDone = true;
+
+    return NS_OK;
+  }
+
+ private:
+  ~RequestResolver() = default;
+
+  bool mDone;
+};
+
+}  // namespace
+
+NS_IMPL_ISUPPORTS(RequestResolver, nsIQuotaCallback)
+
+// static
+void QuotaManagerDependencyFixture::InitializeFixture() {
+  // Some QuotaManagerService methods fail if the testing pref is not set.
+  nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+
+  prefs->SetBoolPref("dom.quotaManager.testing", true);
+
+  // The first initialization of storage service must be done on the main
+  // thread.
+  nsCOMPtr<mozIStorageService> storageService =
+      do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
+  ASSERT_TRUE(storageService);
+
+  nsIObserver* observer = QuotaManager::GetObserver();
+  ASSERT_TRUE(observer);
+
+  nsresult rv = observer->Observe(nullptr, "profile-do-change", nullptr);
+  ASSERT_NS_SUCCEEDED(rv);
+
+  ASSERT_NO_FATAL_FAILURE(EnsureQuotaManager());
+
+  QuotaManager* quotaManager = QuotaManager::Get();
+  ASSERT_TRUE(quotaManager);
+
+  ASSERT_TRUE(quotaManager->OwningThread());
+
+  sBackgroundTarget = quotaManager->OwningThread();
+}
+
+// static
+void QuotaManagerDependencyFixture::ShutdownFixture() {
+  nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+
+  prefs->SetBoolPref("dom.quotaManager.testing", false);
+
+  nsIObserver* observer = QuotaManager::GetObserver();
+  ASSERT_TRUE(observer);
+
+  nsresult rv = observer->Observe(nullptr, "profile-before-change-qm", nullptr);
+  ASSERT_NS_SUCCEEDED(rv);
+
+  PerformOnBackgroundThread([]() { QuotaManager::Reset(); });
+
+  sBackgroundTarget = nullptr;
+}
+
+// static
+void QuotaManagerDependencyFixture::InitializeStorage() {
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+}
+
+// static
+void QuotaManagerDependencyFixture::StorageInitialized(bool* aResult) {
+  ASSERT_TRUE(aResult);
+
+  PerformOnBackgroundThread([aResult]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->StorageInitialized()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [aResult, &done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          if (aValue.IsResolve()) {
+            *aResult = aValue.ResolveValue();
+          } else {
+            *aResult = false;
+          }
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+}
+
+// static
+void QuotaManagerDependencyFixture::AssertStorageInitialized() {
+  bool result;
+  ASSERT_NO_FATAL_FAILURE(StorageInitialized(&result));
+  ASSERT_TRUE(result);
+}
+
+// static
+void QuotaManagerDependencyFixture::AssertStorageNotInitialized() {
+  bool result;
+  ASSERT_NO_FATAL_FAILURE(StorageInitialized(&result));
+  ASSERT_FALSE(result);
+}
+
+// static
+void QuotaManagerDependencyFixture::ShutdownStorage() {
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->ShutdownStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+}
+
+// static
+void QuotaManagerDependencyFixture::ClearStoragesForOrigin(
+    const OriginMetadata& aOriginMetadata) {
+  PerformOnBackgroundThread([&aOriginMetadata]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    nsCOMPtr<nsIPrincipal> principal =
+        BasePrincipal::CreateContentPrincipal(aOriginMetadata.mOrigin);
+    QM_TRY(MOZ_TO_RESULT(principal), QM_TEST_FAIL);
+
+    mozilla::ipc::PrincipalInfo principalInfo;
+    QM_TRY(MOZ_TO_RESULT(PrincipalToPrincipalInfo(principal, &principalInfo)),
+           QM_TEST_FAIL);
+
+    bool done = false;
+
+    quotaManager
+        ->ClearStoragesForOrigin(/* aPersistenceType */ Nothing(),
+                                 principalInfo, /* aClientType */ Nothing())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+}
+
+// static
+OriginMetadata QuotaManagerDependencyFixture::GetTestOriginMetadata() {
+  return {""_ns,
+          "example.com"_ns,
+          "http://example.com"_ns,
+          "http://example.com"_ns,
+          /* aIsPrivate */ false,
+          PERSISTENCE_TYPE_DEFAULT};
+}
+
+// static
+ClientMetadata QuotaManagerDependencyFixture::GetTestClientMetadata() {
+  return {GetTestOriginMetadata(), Client::SDB};
+}
+
+// static
+OriginMetadata QuotaManagerDependencyFixture::GetOtherTestOriginMetadata() {
+  return {""_ns,
+          "other-example.com"_ns,
+          "http://other-example.com"_ns,
+          "http://other-example.com"_ns,
+          /* aIsPrivate */ false,
+          PERSISTENCE_TYPE_DEFAULT};
+}
+
+// static
+ClientMetadata QuotaManagerDependencyFixture::GetOtherTestClientMetadata() {
+  return {GetOtherTestOriginMetadata(), Client::SDB};
+}
+
+// static
+void QuotaManagerDependencyFixture::EnsureQuotaManager() {
+  AutoJSAPI jsapi;
+
+  bool ok = jsapi.Init(xpc::PrivilegedJunkScope());
+  ASSERT_TRUE(ok);
+
+  nsCOMPtr<nsIQuotaManagerService> qms = QuotaManagerService::GetOrCreate();
+  ASSERT_TRUE(qms);
+
+  // In theory, any nsIQuotaManagerService method which ensures quota manager
+  // on the PBackground thread, could be called here. `StorageName` was chosen
+  // because it doesn't need to do any directory locking or IO.
+  // XXX Consider adding a dedicated nsIQuotaManagerService method for this.
+  nsCOMPtr<nsIQuotaRequest> request;
+  nsresult rv = qms->StorageName(getter_AddRefs(request));
+  ASSERT_NS_SUCCEEDED(rv);
+
+  RefPtr<RequestResolver> resolver = new RequestResolver();
+
+  rv = request->SetCallback(resolver);
+  ASSERT_NS_SUCCEEDED(rv);
+
+  SpinEventLoopUntil("Promise is fulfilled"_ns,
+                     [&resolver]() { return resolver->Done(); });
+}
+
+nsCOMPtr<nsISerialEventTarget> QuotaManagerDependencyFixture::sBackgroundTarget;
+
+}  // namespace mozilla::dom::quota::test
diff --git a/dom/quota/test/gtest/QuotaManagerDependencyFixture.h b/dom/quota/test/gtest/QuotaManagerDependencyFixture.h
new file mode 100644
index 0000000000..639db91c55
--- /dev/null
+++ b/dom/quota/test/gtest/QuotaManagerDependencyFixture.h
@@ -0,0 +1,137 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_QUOTA_TEST_GTEST_QUOTAMANAGERDEPENDENCYFIXTURE_H_
+#define DOM_QUOTA_TEST_GTEST_QUOTAMANAGERDEPENDENCYFIXTURE_H_
+
+#include "gtest/gtest.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/SpinEventLoopUntil.h"
+#include "mozilla/dom/quota/DirectoryLock.h"
+#include "mozilla/dom/quota/ForwardDecls.h"
+#include "mozilla/dom/quota/QuotaManager.h"
+
+#define QM_TEST_FAIL [](nsresult) { FAIL(); }
+
+namespace mozilla::dom::quota::test {
+
+class QuotaManagerDependencyFixture : public testing::Test {
+ public:
+  static void InitializeFixture();
+  static void ShutdownFixture();
+
+  static void InitializeStorage();
+  static void StorageInitialized(bool* aResult);
+  static void AssertStorageInitialized();
+  static void AssertStorageNotInitialized();
+  static void ShutdownStorage();
+
+  static void ClearStoragesForOrigin(const OriginMetadata& aOriginMetadata);
+
+  /* Convenience method for tasks which must be called on PBackground thread */
+  template <class Invokable, class... Args>
+  static void PerformOnBackgroundThread(Invokable&& aInvokable,
+                                        Args&&... aArgs) {
+    bool done = false;
+    auto boundTask =
+        // For c++17, bind is cleaner than tuple for parameter pack forwarding
+        // NOLINTNEXTLINE(modernize-avoid-bind)
+        std::bind(std::forward<Invokable>(aInvokable),
+                  std::forward<Args>(aArgs)...);
+    InvokeAsync(BackgroundTargetStrongRef(), __func__,
+                [boundTask = std::move(boundTask)]() mutable {
+                  boundTask();
+                  return BoolPromise::CreateAndResolve(true, __func__);
+                })
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const BoolPromise::ResolveOrRejectValue& /* aValue */) {
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  }
+
+  /* Convenience method for tasks which must be executed on IO thread */
+  template <class Invokable, class... Args>
+  static void PerformOnIOThread(Invokable&& aInvokable, Args&&... aArgs) {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+    auto boundTask =
+        // For c++17, bind is cleaner than tuple for parameter pack forwarding
+        // NOLINTNEXTLINE(modernize-avoid-bind)
+        std::bind(std::forward<Invokable>(aInvokable),
+                  std::forward<Args>(aArgs)...);
+    InvokeAsync(quotaManager->IOThread(), __func__,
+                [boundTask = std::move(boundTask)]() mutable {
+                  boundTask();
+                  return BoolPromise::CreateAndResolve(true, __func__);
+                })
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const BoolPromise::ResolveOrRejectValue& value) {
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  }
+
+  template <class Task>
+  static void PerformClientDirectoryTest(const ClientMetadata& aClientMetadata,
+                                         Task&& aTask) {
+    PerformOnBackgroundThread([clientMetadata = aClientMetadata,
+                               task = std::forward<Task>(aTask)]() mutable {
+      RefPtr<ClientDirectoryLock> directoryLock;
+
+      QuotaManager* quotaManager = QuotaManager::Get();
+      ASSERT_TRUE(quotaManager);
+
+      bool done = false;
+
+      quotaManager->OpenClientDirectory(clientMetadata)
+          ->Then(
+              GetCurrentSerialEventTarget(), __func__,
+              [&directoryLock,
+               &done](RefPtr<ClientDirectoryLock> aResolveValue) {
+                directoryLock = std::move(aResolveValue);
+
+                done = true;
+              },
+              [&done](const nsresult aRejectValue) {
+                ASSERT_TRUE(false);
+
+                done = true;
+              });
+
+      SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+      ASSERT_TRUE(directoryLock);
+
+      PerformOnIOThread(std::move(task), directoryLock->Id());
+
+      directoryLock = nullptr;
+    });
+  }
+
+  static const nsCOMPtr<nsISerialEventTarget>& BackgroundTargetStrongRef() {
+    return sBackgroundTarget;
+  }
+
+  static OriginMetadata GetTestOriginMetadata();
+  static ClientMetadata GetTestClientMetadata();
+
+  static OriginMetadata GetOtherTestOriginMetadata();
+  static ClientMetadata GetOtherTestClientMetadata();
+
+ private:
+  static void EnsureQuotaManager();
+
+  static nsCOMPtr<nsISerialEventTarget> sBackgroundTarget;
+};
+
+}  // namespace mozilla::dom::quota::test
+
+#endif  // DOM_QUOTA_TEST_GTEST_QUOTAMANAGERDEPENDENCYFIXTURE_H_
diff --git a/dom/quota/test/gtest/QuotaTestChild.h b/dom/quota/test/gtest/QuotaTestChild.h
new file mode 100644
index 0000000000..d0d87d8267
--- /dev/null
+++ b/dom/quota/test/gtest/QuotaTestChild.h
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_QUOTA_TEST_GTEST_QUOTATESTCHILD_H_
+#define DOM_QUOTA_TEST_GTEST_QUOTATESTCHILD_H_
+
+#include "mozilla/dom/quota/PQuotaTestChild.h"
+
+namespace mozilla::dom::quota {
+
+class QuotaTestChild : public PQuotaTestChild {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(QuotaTestChild, override)
+
+ private:
+  ~QuotaTestChild() = default;
+};
+
+}  // namespace mozilla::dom::quota
+
+#endif  // DOM_QUOTA_TEST_GTEST_QUOTATESTCHILD_H_
diff --git a/dom/quota/test/gtest/QuotaTestParent.h b/dom/quota/test/gtest/QuotaTestParent.h
new file mode 100644
index 0000000000..5ec1e128b3
--- /dev/null
+++ b/dom/quota/test/gtest/QuotaTestParent.h
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_QUOTA_TEST_GTEST_QUOTATESTPARENT_H_
+#define DOM_QUOTA_TEST_GTEST_QUOTATESTPARENT_H_
+
+#include "mozilla/dom/quota/PQuotaTestParent.h"
+
+namespace mozilla::dom::quota {
+
+class QuotaTestParent : public PQuotaTestParent {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(QuotaTestParent, override)
+
+ public:
+  mozilla::ipc::IPCResult RecvTry_Success_CustomErr_QmIpcFail(
+      bool* aTryDidNotReturn);
+
+  mozilla::ipc::IPCResult RecvTry_Success_CustomErr_IpcFail(
+      bool* aTryDidNotReturn);
+
+  mozilla::ipc::IPCResult RecvTryInspect_Success_CustomErr_QmIpcFail(
+      bool* aTryDidNotReturn);
+
+  mozilla::ipc::IPCResult RecvTryInspect_Success_CustomErr_IpcFail(
+      bool* aTryDidNotReturn);
+
+ private:
+  ~QuotaTestParent() = default;
+};
+
+}  // namespace mozilla::dom::quota
+
+#endif  // DOM_QUOTA_TEST_GTEST_QUOTATESTPARENT_H_
diff --git a/dom/quota/test/gtest/TestCheckedUnsafePtr.cpp b/dom/quota/test/gtest/TestCheckedUnsafePtr.cpp
new file mode 100644
index 0000000000..14abb6631d
--- /dev/null
+++ b/dom/quota/test/gtest/TestCheckedUnsafePtr.cpp
@@ -0,0 +1,145 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/CheckedUnsafePtr.h"
+
+#include "gtest/gtest.h"
+
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include "mozilla/fallible.h"
+
+using namespace mozilla;
+
+class NoCheckTestType
+    : public SupportsCheckedUnsafePtr<DoNotCheckCheckedUnsafePtrs> {};
+
+#if __cplusplus < 202002L
+static_assert(std::is_literal_type_v<CheckedUnsafePtr<NoCheckTestType>>);
+#endif
+
+static_assert(
+    std::is_trivially_copy_constructible_v<CheckedUnsafePtr<NoCheckTestType>>);
+static_assert(
+    std::is_trivially_copy_assignable_v<CheckedUnsafePtr<NoCheckTestType>>);
+static_assert(
+    std::is_trivially_move_constructible_v<CheckedUnsafePtr<NoCheckTestType>>);
+static_assert(
+    std::is_trivially_move_assignable_v<CheckedUnsafePtr<NoCheckTestType>>);
+
+class TestCheckingPolicy : public CheckCheckedUnsafePtrs<TestCheckingPolicy> {
+ protected:
+  explicit TestCheckingPolicy(bool& aPassedCheck)
+      : mPassedCheck(aPassedCheck) {}
+
+ private:
+  friend class mozilla::CheckingPolicyAccess;
+  void NotifyCheckFailure() { mPassedCheck = false; }
+
+  bool& mPassedCheck;
+};
+
+struct BasePointee : public SupportsCheckedUnsafePtr<TestCheckingPolicy> {
+  explicit BasePointee(bool& aCheckPassed)
+      : SupportsCheckedUnsafePtr<TestCheckingPolicy>(aCheckPassed) {}
+};
+
+struct DerivedPointee : public BasePointee {
+  using BasePointee::BasePointee;
+};
+
+class CheckedUnsafePtrTest : public ::testing::Test {
+ protected:
+  bool mPassedCheck = true;
+};
+
+TEST_F(CheckedUnsafePtrTest, PointeeWithNoCheckedUnsafePtrs) {
+  { DerivedPointee pointee{mPassedCheck}; }
+  ASSERT_TRUE(mPassedCheck);
+}
+
+template <typename PointerType>
+class TypedCheckedUnsafePtrTest : public CheckedUnsafePtrTest {};
+
+TYPED_TEST_SUITE_P(TypedCheckedUnsafePtrTest);
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest, PointeeWithOneCheckedUnsafePtr) {
+  {
+    DerivedPointee pointee{this->mPassedCheck};
+    CheckedUnsafePtr<TypeParam> ptr = &pointee;
+  }
+  ASSERT_TRUE(this->mPassedCheck);
+}
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest, CheckedUnsafePtrCopyConstructed) {
+  {
+    DerivedPointee pointee{this->mPassedCheck};
+    CheckedUnsafePtr<TypeParam> ptr1 = &pointee;
+    CheckedUnsafePtr<TypeParam> ptr2 = ptr1;
+  }
+  ASSERT_TRUE(this->mPassedCheck);
+}
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest, CheckedUnsafePtrCopyAssigned) {
+  {
+    DerivedPointee pointee{this->mPassedCheck};
+    CheckedUnsafePtr<TypeParam> ptr1 = &pointee;
+    CheckedUnsafePtr<TypeParam> ptr2;
+    ptr2 = ptr1;
+  }
+  ASSERT_TRUE(this->mPassedCheck);
+}
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest,
+             PointeeWithOneDanglingCheckedUnsafePtr) {
+  [this]() -> CheckedUnsafePtr<TypeParam> {
+    DerivedPointee pointee{this->mPassedCheck};
+    return &pointee;
+  }();
+  ASSERT_FALSE(this->mPassedCheck);
+}
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest,
+             PointeeWithOneCopiedDanglingCheckedUnsafePtr) {
+  const auto dangling1 = [this]() -> CheckedUnsafePtr<DerivedPointee> {
+    DerivedPointee pointee{this->mPassedCheck};
+    return &pointee;
+  }();
+  EXPECT_FALSE(this->mPassedCheck);
+
+  // With AddressSanitizer we would hopefully detect if the copy constructor
+  // tries to add dangling2 to the now-gone pointee's unsafe pointer array. No
+  // promises though, since it might be optimized away.
+  CheckedUnsafePtr<TypeParam> dangling2{dangling1};
+  ASSERT_TRUE(dangling2);
+}
+
+TYPED_TEST_P(TypedCheckedUnsafePtrTest,
+             PointeeWithOneCopyAssignedDanglingCheckedUnsafePtr) {
+  const auto dangling1 = [this]() -> CheckedUnsafePtr<DerivedPointee> {
+    DerivedPointee pointee{this->mPassedCheck};
+    return &pointee;
+  }();
+  EXPECT_FALSE(this->mPassedCheck);
+
+  // With AddressSanitizer we would hopefully detect if the assignment tries to
+  // add dangling2 to the now-gone pointee's unsafe pointer array. No promises
+  // though, since it might be optimized away.
+  CheckedUnsafePtr<TypeParam> dangling2;
+  dangling2 = dangling1;
+  ASSERT_TRUE(dangling2);
+}
+
+REGISTER_TYPED_TEST_SUITE_P(TypedCheckedUnsafePtrTest,
+                            PointeeWithOneCheckedUnsafePtr,
+                            CheckedUnsafePtrCopyConstructed,
+                            CheckedUnsafePtrCopyAssigned,
+                            PointeeWithOneDanglingCheckedUnsafePtr,
+                            PointeeWithOneCopiedDanglingCheckedUnsafePtr,
+                            PointeeWithOneCopyAssignedDanglingCheckedUnsafePtr);
+
+using BothTypes = ::testing::Types<BasePointee, DerivedPointee>;
+INSTANTIATE_TYPED_TEST_SUITE_P(InstantiationOf, TypedCheckedUnsafePtrTest,
+                               BothTypes);
diff --git a/dom/quota/test/gtest/TestClientUsageArray.cpp b/dom/quota/test/gtest/TestClientUsageArray.cpp
new file mode 100644
index 0000000000..f5db984ccd
--- /dev/null
+++ b/dom/quota/test/gtest/TestClientUsageArray.cpp
@@ -0,0 +1,17 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ClientUsageArray.h"
+#include "gtest/gtest.h"
+
+using namespace mozilla::dom::quota;
+
+TEST(DOM_Quota_ClientUsageArray, Deserialize)
+{
+  ClientUsageArray clientUsages;
+  nsresult rv = clientUsages.Deserialize("I872215 C8404073805 L161709"_ns);
+  ASSERT_EQ(rv, NS_OK);
+}
diff --git a/dom/quota/test/gtest/TestEncryptedStream.cpp b/dom/quota/test/gtest/TestEncryptedStream.cpp
new file mode 100644
index 0000000000..8937b0c4e7
--- /dev/null
+++ b/dom/quota/test/gtest/TestEncryptedStream.cpp
@@ -0,0 +1,804 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <cstdlib>
+#include <new>
+#include <numeric>
+#include <ostream>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+#include "ErrorList.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/FixedBufferOutputStream.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Span.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/SafeRefPtr.h"
+#include "mozilla/dom/quota/DecryptingInputStream_impl.h"
+#include "mozilla/dom/quota/DummyCipherStrategy.h"
+#include "mozilla/dom/quota/EncryptedBlock.h"
+#include "mozilla/dom/quota/EncryptingOutputStream_impl.h"
+#include "mozilla/dom/quota/NSSCipherStrategy.h"
+#include "mozilla/fallible.h"
+#include "nsCOMPtr.h"
+#include "nsError.h"
+#include "nsICloneableInputStream.h"
+#include "nsIInputStream.h"
+#include "nsIOutputStream.h"
+#include "nsISeekableStream.h"
+#include "nsISupports.h"
+#include "nsITellableStream.h"
+#include "nsStreamUtils.h"
+#include "nsString.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+#include "nscore.h"
+#include "nss.h"
+
+namespace mozilla::dom::quota {
+
+// Similar to ArrayBufferInputStream from netwerk/base/ArrayBufferInputStream.h,
+// but this is initialized from a Span on construction, rather than lazily from
+// a JS ArrayBuffer.
+class ArrayBufferInputStream : public nsIInputStream,
+                               public nsISeekableStream,
+                               public nsICloneableInputStream {
+ public:
+  explicit ArrayBufferInputStream(mozilla::Span<const uint8_t> aData);
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSITELLABLESTREAM
+  NS_DECL_NSISEEKABLESTREAM
+  NS_DECL_NSICLONEABLEINPUTSTREAM
+
+ private:
+  virtual ~ArrayBufferInputStream() = default;
+
+  mozilla::UniquePtr<char[]> mArrayBuffer;
+  uint32_t mBufferLength;
+  uint32_t mPos;
+  bool mClosed;
+};
+
+NS_IMPL_ADDREF(ArrayBufferInputStream);
+NS_IMPL_RELEASE(ArrayBufferInputStream);
+
+NS_INTERFACE_MAP_BEGIN(ArrayBufferInputStream)
+  NS_INTERFACE_MAP_ENTRY(nsIInputStream)
+  NS_INTERFACE_MAP_ENTRY(nsISeekableStream)
+  NS_INTERFACE_MAP_ENTRY(nsICloneableInputStream)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIInputStream)
+NS_INTERFACE_MAP_END
+
+ArrayBufferInputStream::ArrayBufferInputStream(
+    mozilla::Span<const uint8_t> aData)
+    : mArrayBuffer(MakeUnique<char[]>(aData.Length())),
+      mBufferLength(aData.Length()),
+      mPos(0),
+      mClosed(false) {
+  std::copy(aData.cbegin(), aData.cend(), mArrayBuffer.get());
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Close() {
+  mClosed = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Available(uint64_t* aCount) {
+  if (mClosed) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  if (mArrayBuffer) {
+    *aCount = mBufferLength ? mBufferLength - mPos : 0;
+  } else {
+    *aCount = 0;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::StreamStatus() {
+  return mClosed ? NS_BASE_STREAM_CLOSED : NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::Read(char* aBuf, uint32_t aCount,
+                             uint32_t* aReadCount) {
+  return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::ReadSegments(nsWriteSegmentFun writer, void* closure,
+                                     uint32_t aCount, uint32_t* result) {
+  MOZ_ASSERT(result, "null ptr");
+  MOZ_ASSERT(mBufferLength >= mPos, "bad stream state");
+
+  if (mClosed) {
+    return NS_BASE_STREAM_CLOSED;
+  }
+
+  MOZ_ASSERT(mArrayBuffer || (mPos == mBufferLength),
+             "stream inited incorrectly");
+
+  *result = 0;
+  while (mPos < mBufferLength) {
+    uint32_t remaining = mBufferLength - mPos;
+    MOZ_ASSERT(mArrayBuffer);
+
+    uint32_t count = std::min(aCount, remaining);
+    if (count == 0) {
+      break;
+    }
+
+    uint32_t written;
+    nsresult rv = writer(this, closure, &mArrayBuffer[0] + mPos, *result, count,
+                         &written);
+    if (NS_FAILED(rv)) {
+      // InputStreams do not propagate errors to caller.
+      return NS_OK;
+    }
+
+    MOZ_ASSERT(written <= count,
+               "writer should not write more than we asked it to write");
+    mPos += written;
+    *result += written;
+    aCount -= written;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ArrayBufferInputStream::IsNonBlocking(bool* aNonBlocking) {
+  // Actually, the stream never blocks, but we lie about it because of the
+  // assumptions in DecryptingInputStream.
+  *aNonBlocking = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP ArrayBufferInputStream::Tell(int64_t* const aRetval) {
+  MOZ_ASSERT(aRetval);
+
+  *aRetval = mPos;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP ArrayBufferInputStream::Seek(const int32_t aWhence,
+                                           const int64_t aOffset) {
+  // XXX This is not safe. it's hard to use CheckedInt here, though. As long as
+  // the class is only used for testing purposes, that's probably fine.
+
+  int32_t newPos = mPos;
+  switch (aWhence) {
+    case NS_SEEK_SET:
+      newPos = aOffset;
+      break;
+    case NS_SEEK_CUR:
+      newPos += aOffset;
+      break;
+    case NS_SEEK_END:
+      newPos = mBufferLength;
+      newPos += aOffset;
+      break;
+    default:
+      return NS_ERROR_ILLEGAL_VALUE;
+  }
+  if (newPos < 0 || static_cast<uint32_t>(newPos) > mBufferLength) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+  mPos = newPos;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP ArrayBufferInputStream::SetEOF() {
+  // Truncating is not supported on a read-only stream.
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP ArrayBufferInputStream::GetCloneable(bool* aCloneable) {
+  *aCloneable = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP ArrayBufferInputStream::Clone(nsIInputStream** _retval) {
+  *_retval = MakeAndAddRef<ArrayBufferInputStream>(
+                 AsBytes(Span{mArrayBuffer.get(), mBufferLength}))
+                 .take();
+
+  return NS_OK;
+}
+}  // namespace mozilla::dom::quota
+
+using namespace mozilla;
+using namespace mozilla::dom::quota;
+
+class DOM_Quota_EncryptedStream : public ::testing::Test {
+ public:
+  static void SetUpTestCase() {
+    // Do this only once, do not tear it down per test case.
+    if (!sNssContext) {
+      sNssContext.reset(
+          NSS_InitContext("", "", "", "", nullptr,
+                          NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+                              NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+                              NSS_INIT_OPTIMIZESPACE | NSS_INIT_NOROOTINIT));
+    }
+  }
+
+  static void TearDownTestCase() { sNssContext = nullptr; }
+
+ private:
+  struct NSSInitContextDeleter {
+    void operator()(NSSInitContext* p) { NSS_ShutdownContext(p); }
+  };
+  inline static std::unique_ptr<NSSInitContext, NSSInitContextDeleter>
+      sNssContext;
+};
+
+enum struct FlushMode { AfterEachChunk, Never };
+enum struct ChunkSize { SingleByte, Unaligned, DataSize };
+
+using PackedTestParams =
+    std::tuple<size_t, ChunkSize, ChunkSize, size_t, FlushMode>;
+
+static size_t EffectiveChunkSize(const ChunkSize aChunkSize,
+                                 const size_t aDataSize) {
+  switch (aChunkSize) {
+    case ChunkSize::SingleByte:
+      return 1;
+    case ChunkSize::Unaligned:
+      return 17;
+    case ChunkSize::DataSize:
+      return aDataSize;
+  }
+  MOZ_CRASH("Unknown ChunkSize");
+}
+
+struct TestParams {
+  MOZ_IMPLICIT constexpr TestParams(const PackedTestParams& aPackedParams)
+      : mDataSize(std::get<0>(aPackedParams)),
+        mWriteChunkSize(std::get<1>(aPackedParams)),
+        mReadChunkSize(std::get<2>(aPackedParams)),
+        mBlockSize(std::get<3>(aPackedParams)),
+        mFlushMode(std::get<4>(aPackedParams)) {}
+
+  constexpr size_t DataSize() const { return mDataSize; }
+
+  size_t EffectiveWriteChunkSize() const {
+    return EffectiveChunkSize(mWriteChunkSize, mDataSize);
+  }
+
+  size_t EffectiveReadChunkSize() const {
+    return EffectiveChunkSize(mReadChunkSize, mDataSize);
+  }
+
+  constexpr size_t BlockSize() const { return mBlockSize; }
+
+  constexpr enum FlushMode FlushMode() const { return mFlushMode; }
+
+ private:
+  size_t mDataSize;
+
+  ChunkSize mWriteChunkSize;
+  ChunkSize mReadChunkSize;
+
+  size_t mBlockSize;
+  enum FlushMode mFlushMode;
+};
+
+std::string TestParamToString(
+    const testing::TestParamInfo<PackedTestParams>& aTestParams) {
+  const TestParams& testParams = aTestParams.param;
+
+  static constexpr char kSeparator[] = "_";
+
+  std::stringstream ss;
+  ss << "data" << testParams.DataSize() << kSeparator << "writechunk"
+     << testParams.EffectiveWriteChunkSize() << kSeparator << "readchunk"
+     << testParams.EffectiveReadChunkSize() << kSeparator << "block"
+     << testParams.BlockSize() << kSeparator;
+  switch (testParams.FlushMode()) {
+    case FlushMode::Never:
+      ss << "FlushNever";
+      break;
+    case FlushMode::AfterEachChunk:
+      ss << "FlushAfterEachChunk";
+      break;
+  };
+  return ss.str();
+}
+
+class ParametrizedCryptTest
+    : public DOM_Quota_EncryptedStream,
+      public testing::WithParamInterface<PackedTestParams> {};
+
+static auto MakeTestData(const size_t aDataSize) {
+  auto data = nsTArray<uint8_t>();
+  data.SetLength(aDataSize);
+  std::iota(data.begin(), data.end(), 0);
+  return data;
+}
+
+template <typename CipherStrategy>
+static void WriteTestData(nsCOMPtr<nsIOutputStream>&& aBaseOutputStream,
+                          const Span<const uint8_t> aData,
+                          const size_t aWriteChunkSize, const size_t aBlockSize,
+                          const typename CipherStrategy::KeyType& aKey,
+                          const FlushMode aFlushMode) {
+  auto outStream = MakeSafeRefPtr<EncryptingOutputStream<CipherStrategy>>(
+      std::move(aBaseOutputStream), aBlockSize, aKey);
+
+  for (auto remaining = aData; !remaining.IsEmpty();) {
+    auto [currentChunk, newRemaining] =
+        remaining.SplitAt(std::min(aWriteChunkSize, remaining.Length()));
+    remaining = newRemaining;
+
+    uint32_t written;
+    EXPECT_EQ(NS_OK, outStream->Write(
+                         reinterpret_cast<const char*>(currentChunk.Elements()),
+                         currentChunk.Length(), &written));
+    EXPECT_EQ(currentChunk.Length(), written);
+
+    if (aFlushMode == FlushMode::AfterEachChunk) {
+      outStream->Flush();
+    }
+  }
+
+  // Close explicitly so we can check the result.
+  EXPECT_EQ(NS_OK, outStream->Close());
+}
+
+template <typename CipherStrategy>
+static void NoExtraChecks(DecryptingInputStream<CipherStrategy>& aInputStream,
+                          Span<const uint8_t> aExpectedData,
+                          Span<const uint8_t> aRemainder) {}
+
+template <typename CipherStrategy,
+          typename ExtraChecks = decltype(NoExtraChecks<CipherStrategy>)>
+static void ReadTestData(
+    DecryptingInputStream<CipherStrategy>& aDecryptingInputStream,
+    const Span<const uint8_t> aExpectedData, const size_t aReadChunkSize,
+    const ExtraChecks& aExtraChecks = NoExtraChecks<CipherStrategy>) {
+  auto readData = nsTArray<uint8_t>();
+  readData.SetLength(aReadChunkSize);
+  for (auto remainder = aExpectedData; !remainder.IsEmpty();) {
+    auto [currentExpected, newExpectedRemainder] =
+        remainder.SplitAt(std::min(aReadChunkSize, remainder.Length()));
+    remainder = newExpectedRemainder;
+
+    uint32_t read;
+    EXPECT_EQ(NS_OK, aDecryptingInputStream.Read(
+                         reinterpret_cast<char*>(readData.Elements()),
+                         currentExpected.Length(), &read));
+    EXPECT_EQ(currentExpected.Length(), read);
+    EXPECT_EQ(currentExpected,
+              Span{readData}.First(currentExpected.Length()).AsConst());
+
+    aExtraChecks(aDecryptingInputStream, aExpectedData, remainder);
+  }
+
+  // Expect EOF.
+  uint32_t read;
+  EXPECT_EQ(NS_OK, aDecryptingInputStream.Read(
+                       reinterpret_cast<char*>(readData.Elements()),
+                       readData.Length(), &read));
+  EXPECT_EQ(0u, read);
+}
+
+template <typename CipherStrategy,
+          typename ExtraChecks = decltype(NoExtraChecks<CipherStrategy>)>
+static auto ReadTestData(
+    MovingNotNull<nsCOMPtr<nsIInputStream>>&& aBaseInputStream,
+    const Span<const uint8_t> aExpectedData, const size_t aReadChunkSize,
+    const size_t aBlockSize, const typename CipherStrategy::KeyType& aKey,
+    const ExtraChecks& aExtraChecks = NoExtraChecks<CipherStrategy>) {
+  auto inStream = MakeSafeRefPtr<DecryptingInputStream<CipherStrategy>>(
+      std::move(aBaseInputStream), aBlockSize, aKey);
+
+  ReadTestData(*inStream, aExpectedData, aReadChunkSize, aExtraChecks);
+
+  return inStream;
+}
+
+// XXX Change to return the buffer instead.
+template <typename CipherStrategy,
+          typename ExtraChecks = decltype(NoExtraChecks<CipherStrategy>)>
+static RefPtr<FixedBufferOutputStream> DoRoundtripTest(
+    const size_t aDataSize, const size_t aWriteChunkSize,
+    const size_t aReadChunkSize, const size_t aBlockSize,
+    const typename CipherStrategy::KeyType& aKey, const FlushMode aFlushMode,
+    const ExtraChecks& aExtraChecks = NoExtraChecks<CipherStrategy>) {
+  // XXX Add deduction guide for RefPtr from already_AddRefed
+  const auto baseOutputStream = WrapNotNull(
+      RefPtr<FixedBufferOutputStream>{FixedBufferOutputStream::Create(2048)});
+
+  const auto data = MakeTestData(aDataSize);
+
+  WriteTestData<CipherStrategy>(
+      nsCOMPtr<nsIOutputStream>{baseOutputStream.get()}, Span{data},
+      aWriteChunkSize, aBlockSize, aKey, aFlushMode);
+
+  const auto baseInputStream =
+      MakeRefPtr<ArrayBufferInputStream>(baseOutputStream->WrittenData());
+
+  ReadTestData<CipherStrategy>(
+      WrapNotNull(nsCOMPtr<nsIInputStream>{baseInputStream}), Span{data},
+      aReadChunkSize, aBlockSize, aKey, aExtraChecks);
+
+  return baseOutputStream;
+}
+
+TEST_P(ParametrizedCryptTest, NSSCipherStrategy) {
+  using CipherStrategy = NSSCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  auto keyOrErr = CipherStrategy::GenerateKey();
+  ASSERT_FALSE(keyOrErr.isErr());
+
+  DoRoundtripTest<CipherStrategy>(
+      testParams.DataSize(), testParams.EffectiveWriteChunkSize(),
+      testParams.EffectiveReadChunkSize(), testParams.BlockSize(),
+      keyOrErr.unwrap(), testParams.FlushMode());
+}
+
+TEST_P(ParametrizedCryptTest, DummyCipherStrategy_CheckOutput) {
+  using CipherStrategy = DummyCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  const auto encryptedDataStream = DoRoundtripTest<CipherStrategy>(
+      testParams.DataSize(), testParams.EffectiveWriteChunkSize(),
+      testParams.EffectiveReadChunkSize(), testParams.BlockSize(),
+      CipherStrategy::KeyType{}, testParams.FlushMode());
+
+  if (HasFailure()) {
+    return;
+  }
+
+  const auto encryptedData = encryptedDataStream->WrittenData();
+  const auto encryptedDataSpan = AsBytes(Span(encryptedData));
+
+  const auto plainTestData = MakeTestData(testParams.DataSize());
+  auto encryptedBlock = EncryptedBlock<DummyCipherStrategy::BlockPrefixLength,
+                                       DummyCipherStrategy::BasicBlockSize>{
+      testParams.BlockSize(),
+  };
+  for (auto [encryptedRemainder, plainRemainder] =
+           std::pair(encryptedDataSpan, Span(plainTestData));
+       !encryptedRemainder.IsEmpty();) {
+    const auto [currentBlock, newEncryptedRemainder] =
+        encryptedRemainder.SplitAt(testParams.BlockSize());
+    encryptedRemainder = newEncryptedRemainder;
+
+    std::copy(currentBlock.cbegin(), currentBlock.cend(),
+              encryptedBlock.MutableWholeBlock().begin());
+
+    ASSERT_FALSE(plainRemainder.IsEmpty());
+    const auto [currentPlain, newPlainRemainder] =
+        plainRemainder.SplitAt(encryptedBlock.ActualPayloadLength());
+    plainRemainder = newPlainRemainder;
+
+    const auto pseudoIV = encryptedBlock.CipherPrefix();
+    const auto payload = encryptedBlock.Payload();
+
+    EXPECT_EQ(Span(DummyCipherStrategy::MakeBlockPrefix()), pseudoIV);
+
+    auto untransformedPayload = nsTArray<uint8_t>();
+    untransformedPayload.SetLength(testParams.BlockSize());
+    DummyCipherStrategy::DummyTransform(payload, untransformedPayload);
+
+    EXPECT_EQ(
+        currentPlain,
+        Span(untransformedPayload).AsConst().First(currentPlain.Length()));
+  }
+}
+
+TEST_P(ParametrizedCryptTest, DummyCipherStrategy_Tell) {
+  using CipherStrategy = DummyCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  DoRoundtripTest<CipherStrategy>(
+      testParams.DataSize(), testParams.EffectiveWriteChunkSize(),
+      testParams.EffectiveReadChunkSize(), testParams.BlockSize(),
+      CipherStrategy::KeyType{}, testParams.FlushMode(),
+      [](auto& inStream, Span<const uint8_t> expectedData,
+         Span<const uint8_t> remainder) {
+        // Check that Tell tells the right position.
+        int64_t pos;
+        EXPECT_EQ(NS_OK, inStream.Tell(&pos));
+        EXPECT_EQ(expectedData.Length() - remainder.Length(),
+                  static_cast<uint64_t>(pos));
+      });
+}
+
+TEST_P(ParametrizedCryptTest, DummyCipherStrategy_Available) {
+  using CipherStrategy = DummyCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  DoRoundtripTest<CipherStrategy>(
+      testParams.DataSize(), testParams.EffectiveWriteChunkSize(),
+      testParams.EffectiveReadChunkSize(), testParams.BlockSize(),
+      CipherStrategy::KeyType{}, testParams.FlushMode(),
+      [](auto& inStream, Span<const uint8_t> expectedData,
+         Span<const uint8_t> remainder) {
+        // Check that Available tells the right remainder.
+        uint64_t available;
+        EXPECT_EQ(NS_OK, inStream.Available(&available));
+        EXPECT_EQ(remainder.Length(), available);
+      });
+}
+
+TEST_P(ParametrizedCryptTest, DummyCipherStrategy_Clone) {
+  using CipherStrategy = DummyCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  // XXX Add deduction guide for RefPtr from already_AddRefed
+  const auto baseOutputStream = WrapNotNull(
+      RefPtr<FixedBufferOutputStream>{FixedBufferOutputStream::Create(2048)});
+
+  const auto data = MakeTestData(testParams.DataSize());
+
+  WriteTestData<CipherStrategy>(
+      nsCOMPtr<nsIOutputStream>{baseOutputStream.get()}, Span{data},
+      testParams.EffectiveWriteChunkSize(), testParams.BlockSize(),
+      CipherStrategy::KeyType{}, testParams.FlushMode());
+
+  const auto baseInputStream =
+      MakeRefPtr<ArrayBufferInputStream>(baseOutputStream->WrittenData());
+
+  const auto inStream = ReadTestData<CipherStrategy>(
+      WrapNotNull(nsCOMPtr<nsIInputStream>{baseInputStream}), Span{data},
+      testParams.EffectiveReadChunkSize(), testParams.BlockSize(),
+      CipherStrategy::KeyType{});
+
+  nsCOMPtr<nsIInputStream> clonedInputStream;
+  EXPECT_EQ(NS_OK, inStream->Clone(getter_AddRefs(clonedInputStream)));
+
+  ReadTestData(
+      static_cast<DecryptingInputStream<CipherStrategy>&>(*clonedInputStream),
+      Span{data}, testParams.EffectiveReadChunkSize());
+}
+
+// XXX This test is actually only parametrized on the block size.
+TEST_P(ParametrizedCryptTest, DummyCipherStrategy_IncompleteBlock) {
+  using CipherStrategy = DummyCipherStrategy;
+  const TestParams& testParams = GetParam();
+
+  // Provide half a block, content doesn't matter.
+  nsTArray<uint8_t> data;
+  data.SetLength(testParams.BlockSize() / 2);
+
+  const auto baseInputStream = MakeRefPtr<ArrayBufferInputStream>(data);
+
+  const auto inStream = MakeSafeRefPtr<DecryptingInputStream<CipherStrategy>>(
+      WrapNotNull(nsCOMPtr<nsIInputStream>{baseInputStream}),
+      testParams.BlockSize(), CipherStrategy::KeyType{});
+
+  nsTArray<uint8_t> readData;
+  readData.SetLength(testParams.BlockSize());
+  uint32_t read;
+  EXPECT_EQ(NS_ERROR_CORRUPTED_CONTENT,
+            inStream->Read(reinterpret_cast<char*>(readData.Elements()),
+                           readData.Length(), &read));
+}
+
+TEST_P(ParametrizedCryptTest, zeroInitializedEncryptedBlock) {
+  const TestParams& testParams = GetParam();
+
+  using EncryptedBlock = EncryptedBlock<DummyCipherStrategy::BlockPrefixLength,
+                                        DummyCipherStrategy::BasicBlockSize>;
+
+  EncryptedBlock encryptedBlock{testParams.BlockSize()};
+  auto firstBlock =
+      encryptedBlock.WholeBlock().First<DummyCipherStrategy::BasicBlockSize>();
+  auto unusedBytesInFirstBlock = firstBlock.from(sizeof(uint16_t));
+
+  EXPECT_TRUE(std::all_of(unusedBytesInFirstBlock.begin(),
+                          unusedBytesInFirstBlock.end(),
+                          [](const auto& e) { return 0ul == e; }));
+}
+
+enum struct SeekOffset {
+  Zero,
+  MinusHalfDataSize,
+  PlusHalfDataSize,
+  PlusDataSize,
+  MinusDataSize
+};
+using SeekOp = std::pair<int32_t, SeekOffset>;
+
+using PackedSeekTestParams = std::tuple<size_t, size_t, std::vector<SeekOp>>;
+
+struct SeekTestParams {
+  size_t mDataSize;
+  size_t mBlockSize;
+  std::vector<SeekOp> mSeekOps;
+
+  MOZ_IMPLICIT SeekTestParams(const PackedSeekTestParams& aPackedParams)
+      : mDataSize(std::get<0>(aPackedParams)),
+        mBlockSize(std::get<1>(aPackedParams)),
+        mSeekOps(std::get<2>(aPackedParams)) {}
+};
+
+std::string SeekTestParamToString(
+    const testing::TestParamInfo<PackedSeekTestParams>& aTestParams) {
+  const SeekTestParams& testParams = aTestParams.param;
+
+  static constexpr char kSeparator[] = "_";
+
+  std::stringstream ss;
+  ss << "data" << testParams.mDataSize << kSeparator << "writechunk"
+     << testParams.mBlockSize << kSeparator;
+  for (const auto& seekOp : testParams.mSeekOps) {
+    switch (seekOp.first) {
+      case nsISeekableStream::NS_SEEK_SET:
+        ss << "Set";
+        break;
+      case nsISeekableStream::NS_SEEK_CUR:
+        ss << "Cur";
+        break;
+      case nsISeekableStream::NS_SEEK_END:
+        ss << "End";
+        break;
+    };
+    switch (seekOp.second) {
+      case SeekOffset::Zero:
+        ss << "Zero";
+        break;
+      case SeekOffset::MinusHalfDataSize:
+        ss << "MinusHalfDataSize";
+        break;
+      case SeekOffset::PlusHalfDataSize:
+        ss << "PlusHalfDataSize";
+        break;
+      case SeekOffset::MinusDataSize:
+        ss << "MinusDataSize";
+        break;
+      case SeekOffset::PlusDataSize:
+        ss << "PlusDataSize";
+        break;
+    };
+  }
+  return ss.str();
+}
+
+class ParametrizedSeekCryptTest
+    : public DOM_Quota_EncryptedStream,
+      public testing::WithParamInterface<PackedSeekTestParams> {};
+
+TEST_P(ParametrizedSeekCryptTest, DummyCipherStrategy_Seek) {
+  using CipherStrategy = DummyCipherStrategy;
+  const SeekTestParams& testParams = GetParam();
+
+  const auto baseOutputStream = WrapNotNull(
+      RefPtr<FixedBufferOutputStream>{FixedBufferOutputStream::Create(2048)});
+
+  const auto data = MakeTestData(testParams.mDataSize);
+
+  WriteTestData<CipherStrategy>(
+      nsCOMPtr<nsIOutputStream>{baseOutputStream.get()}, Span{data},
+      testParams.mDataSize, testParams.mBlockSize, CipherStrategy::KeyType{},
+      FlushMode::Never);
+
+  const auto baseInputStream =
+      MakeRefPtr<ArrayBufferInputStream>(baseOutputStream->WrittenData());
+
+  const auto inStream = MakeSafeRefPtr<DecryptingInputStream<CipherStrategy>>(
+      WrapNotNull(nsCOMPtr<nsIInputStream>{baseInputStream}),
+      testParams.mBlockSize, CipherStrategy::KeyType{});
+
+  uint32_t accumulatedOffset = 0;
+  for (const auto& seekOp : testParams.mSeekOps) {
+    const auto offset = [offsetKind = seekOp.second,
+                         dataSize = testParams.mDataSize]() -> int64_t {
+      switch (offsetKind) {
+        case SeekOffset::Zero:
+          return 0;
+        case SeekOffset::MinusHalfDataSize:
+          return -static_cast<int64_t>(dataSize) / 2;
+        case SeekOffset::PlusHalfDataSize:
+          return dataSize / 2;
+        case SeekOffset::MinusDataSize:
+          return -static_cast<int64_t>(dataSize);
+        case SeekOffset::PlusDataSize:
+          return dataSize;
+      }
+      MOZ_CRASH("Unknown SeekOffset");
+    }();
+    switch (seekOp.first) {
+      case nsISeekableStream::NS_SEEK_SET:
+        accumulatedOffset = offset;
+        break;
+      case nsISeekableStream::NS_SEEK_CUR:
+        accumulatedOffset += offset;
+        break;
+      case nsISeekableStream::NS_SEEK_END:
+        accumulatedOffset = testParams.mDataSize + offset;
+        break;
+    }
+    EXPECT_EQ(NS_OK, inStream->Seek(seekOp.first, offset));
+  }
+
+  {
+    int64_t actualOffset;
+    EXPECT_EQ(NS_OK, inStream->Tell(&actualOffset));
+
+    EXPECT_EQ(actualOffset, accumulatedOffset);
+  }
+
+  auto readData = nsTArray<uint8_t>();
+  readData.SetLength(data.Length());
+  uint32_t read;
+  EXPECT_EQ(NS_OK, inStream->Read(reinterpret_cast<char*>(readData.Elements()),
+                                  readData.Length(), &read));
+  // XXX Or should 'read' indicate the actual number of bytes read,
+  // including the encryption overhead?
+  EXPECT_EQ(testParams.mDataSize - accumulatedOffset, read);
+  EXPECT_EQ(Span{data}.SplitAt(accumulatedOffset).second,
+            Span{readData}.First(read).AsConst());
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    DOM_Quota_EncryptedStream_Parametrized, ParametrizedCryptTest,
+    testing::Combine(
+        /* dataSize */ testing::Values(0u, 16u, 256u, 512u, 513u),
+        /* writeChunkSize */
+        testing::Values(ChunkSize::SingleByte, ChunkSize::Unaligned,
+                        ChunkSize::DataSize),
+        /* readChunkSize */
+        testing::Values(ChunkSize::SingleByte, ChunkSize::Unaligned,
+                        ChunkSize::DataSize),
+        /* blockSize */ testing::Values(256u, 1024u /*, 8192u*/),
+        /* flushMode */
+        testing::Values(FlushMode::Never, FlushMode::AfterEachChunk)),
+    TestParamToString);
+
+INSTANTIATE_TEST_SUITE_P(
+    DOM_IndexedDB_EncryptedStream_ParametrizedSeek, ParametrizedSeekCryptTest,
+    testing::Combine(
+        /* dataSize */ testing::Values(0u, 16u, 256u, 512u, 513u),
+        /* blockSize */ testing::Values(256u, 1024u /*, 8192u*/),
+        /* seekOperations */
+        testing::Values(/* NS_SEEK_SET only, single ops */
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_SET,
+                                             SeekOffset::PlusDataSize}},
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_SET,
+                                             SeekOffset::PlusHalfDataSize}},
+                        /* NS_SEEK_SET only, multiple ops */
+                        std::vector<SeekOp>{
+                            {nsISeekableStream::NS_SEEK_SET,
+                             SeekOffset::PlusHalfDataSize},
+                            {nsISeekableStream::NS_SEEK_SET, SeekOffset::Zero}},
+                        /* NS_SEEK_CUR only, single ops */
+                        std::vector<SeekOp>{
+                            {nsISeekableStream::NS_SEEK_CUR, SeekOffset::Zero}},
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_CUR,
+                                             SeekOffset::PlusDataSize}},
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_CUR,
+                                             SeekOffset::PlusHalfDataSize}},
+                        /* NS_SEEK_END only, single ops */
+                        std::vector<SeekOp>{
+                            {nsISeekableStream::NS_SEEK_END, SeekOffset::Zero}},
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_END,
+                                             SeekOffset::MinusDataSize}},
+                        std::vector<SeekOp>{{nsISeekableStream::NS_SEEK_END,
+                                             SeekOffset::MinusHalfDataSize}})),
+    SeekTestParamToString);
diff --git a/dom/quota/test/gtest/TestFileOutputStream.cpp b/dom/quota/test/gtest/TestFileOutputStream.cpp
new file mode 100644
index 0000000000..231003fd6c
--- /dev/null
+++ b/dom/quota/test/gtest/TestFileOutputStream.cpp
@@ -0,0 +1,227 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/Client.h"
+#include "mozilla/dom/quota/CommonMetadata.h"
+#include "mozilla/dom/quota/DirectoryLock.h"
+#include "mozilla/dom/quota/FileStreams.h"
+#include "mozilla/dom/quota/QuotaManager.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "QuotaManagerDependencyFixture.h"
+
+namespace mozilla::dom::quota::test {
+
+quota::OriginMetadata GetOutputStreamTestOriginMetadata() {
+  return quota::OriginMetadata{""_ns,
+                               "example.com"_ns,
+                               "http://example.com"_ns,
+                               "http://example.com"_ns,
+                               /* aIsPrivate */ false,
+                               quota::PERSISTENCE_TYPE_DEFAULT};
+}
+
+class TestFileOutputStream : public QuotaManagerDependencyFixture {
+ public:
+  static void SetUpTestCase() {
+    ASSERT_NO_FATAL_FAILURE(InitializeFixture());
+
+    nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+
+    prefs->SetIntPref("dom.quotaManager.temporaryStorage.fixedLimit",
+                      mQuotaLimit);
+  }
+
+  static void TearDownTestCase() {
+    nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+
+    prefs->ClearUserPref("dom.quotaManager.temporaryStorage.fixedLimit");
+
+    EXPECT_NO_FATAL_FAILURE(
+        ClearStoragesForOrigin(GetOutputStreamTestOriginMetadata()));
+
+    ASSERT_NO_FATAL_FAILURE(ShutdownFixture());
+  }
+
+  static const int32_t mQuotaLimit = 8192;
+};
+
+TEST_F(TestFileOutputStream, extendFileStreamWithSetEOF) {
+  auto backgroundTask = []() {
+    auto ioTask = []() {
+      quota::QuotaManager* quotaManager = quota::QuotaManager::Get();
+
+      auto originMetadata = GetOutputStreamTestOriginMetadata();
+
+      {
+        ASSERT_NS_SUCCEEDED(
+            quotaManager->EnsureTemporaryStorageIsInitializedInternal());
+
+        auto res = quotaManager->EnsureTemporaryOriginIsInitialized(
+            quota::PERSISTENCE_TYPE_DEFAULT, originMetadata);
+        ASSERT_TRUE(res.isOk());
+      }
+
+      const int64_t groupLimit =
+          static_cast<int64_t>(quotaManager->GetGroupLimit());
+      ASSERT_TRUE(mQuotaLimit * 1024LL == groupLimit);
+
+      // We don't use the tested stream itself to check the file size as it
+      // may report values which have not been written to disk.
+      RefPtr<quota::FileOutputStream> check =
+          MakeRefPtr<quota::FileOutputStream>(quota::PERSISTENCE_TYPE_DEFAULT,
+                                              originMetadata,
+                                              quota::Client::Type::SDB);
+
+      RefPtr<quota::FileOutputStream> stream =
+          MakeRefPtr<quota::FileOutputStream>(quota::PERSISTENCE_TYPE_DEFAULT,
+                                              originMetadata,
+                                              quota::Client::Type::SDB);
+
+      {
+        auto testPathRes = quotaManager->GetOriginDirectory(originMetadata);
+
+        ASSERT_TRUE(testPathRes.isOk());
+
+        nsCOMPtr<nsIFile> testPath = testPathRes.unwrap();
+
+        ASSERT_NS_SUCCEEDED(testPath->AppendRelativePath(u"sdb"_ns));
+
+        ASSERT_NS_SUCCEEDED(
+            testPath->AppendRelativePath(u"tTestFileOutputStream.txt"_ns));
+
+        bool exists = true;
+        ASSERT_NS_SUCCEEDED(testPath->Exists(&exists));
+
+        if (exists) {
+          ASSERT_NS_SUCCEEDED(testPath->Remove(/* recursive */ false));
+        }
+
+        ASSERT_NS_SUCCEEDED(testPath->Exists(&exists));
+        ASSERT_FALSE(exists);
+
+        ASSERT_NS_SUCCEEDED(testPath->Create(nsIFile::NORMAL_FILE_TYPE, 0666));
+
+        ASSERT_NS_SUCCEEDED(testPath->Exists(&exists));
+        ASSERT_TRUE(exists);
+
+        nsCOMPtr<nsIFile> checkPath;
+        ASSERT_NS_SUCCEEDED(testPath->Clone(getter_AddRefs(checkPath)));
+
+        const int32_t IOFlags = -1;
+        const int32_t perm = -1;
+        const int32_t behaviorFlags = 0;
+        ASSERT_NS_SUCCEEDED(
+            stream->Init(testPath, IOFlags, perm, behaviorFlags));
+
+        ASSERT_NS_SUCCEEDED(
+            check->Init(testPath, IOFlags, perm, behaviorFlags));
+      }
+
+      // Check that we start with an empty file
+      int64_t avail = 42;
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(0 == avail);
+
+      // Enlarge the file
+      const int64_t toSize = groupLimit;
+      ASSERT_NS_SUCCEEDED(stream->Seek(nsISeekableStream::NS_SEEK_SET, toSize));
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(0 == avail);
+
+      ASSERT_NS_SUCCEEDED(stream->SetEOF());
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toSize == avail);
+
+      // Try to enlarge the file past the limit
+      const int64_t overGroupLimit = groupLimit + 1;
+
+      // Seeking is allowed
+      ASSERT_NS_SUCCEEDED(
+          stream->Seek(nsISeekableStream::NS_SEEK_SET, overGroupLimit));
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toSize == avail);
+
+      // Setting file size to exceed quota should yield no device space error
+      ASSERT_TRUE(NS_ERROR_FILE_NO_DEVICE_SPACE == stream->SetEOF());
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toSize == avail);
+
+      // Shrink the file
+      const int64_t toHalfSize = toSize / 2;
+      ASSERT_NS_SUCCEEDED(
+          stream->Seek(nsISeekableStream::NS_SEEK_SET, toHalfSize));
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toSize == avail);
+
+      ASSERT_NS_SUCCEEDED(stream->SetEOF());
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toHalfSize == avail);
+
+      // Shrink the file back to nothing
+      ASSERT_NS_SUCCEEDED(stream->Seek(nsISeekableStream::NS_SEEK_SET, 0));
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(toHalfSize == avail);
+
+      ASSERT_NS_SUCCEEDED(stream->SetEOF());
+
+      ASSERT_NS_SUCCEEDED(check->GetSize(&avail));
+
+      ASSERT_TRUE(0 == avail);
+    };
+
+    RefPtr<ClientDirectoryLock> directoryLock;
+
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager
+        ->OpenClientDirectory(
+            {GetOutputStreamTestOriginMetadata(), Client::SDB})
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&directoryLock, &done](RefPtr<ClientDirectoryLock> aResolveValue) {
+              directoryLock = std::move(aResolveValue);
+
+              done = true;
+            },
+            [&done](const nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    ASSERT_TRUE(directoryLock);
+
+    PerformOnIOThread(std::move(ioTask));
+
+    directoryLock = nullptr;
+  };
+
+  PerformOnBackgroundThread(std::move(backgroundTask));
+}
+
+}  // namespace mozilla::dom::quota::test
diff --git a/dom/quota/test/gtest/TestFlatten.cpp b/dom/quota/test/gtest/TestFlatten.cpp
new file mode 100644
index 0000000000..5ca7675887
--- /dev/null
+++ b/dom/quota/test/gtest/TestFlatten.cpp
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Flatten.h"
+
+#include "gtest/gtest.h"
+
+#include "mozilla/Unused.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom::quota {
+
+#ifdef __clang__
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wunreachable-code-loop-increment"
+#endif
+TEST(Flatten, FlatEmpty)
+{
+  for (const auto& item : Flatten<int>(nsTArray<int>{})) {
+    Unused << item;
+    FAIL();
+  }
+}
+
+TEST(Flatten, NestedOuterEmpty)
+{
+  for (const auto& item : Flatten<int>(nsTArray<CopyableTArray<int>>{})) {
+    Unused << item;
+    FAIL();
+  }
+}
+
+TEST(Flatten, NestedInnerEmpty)
+{
+  for (const auto& item :
+       Flatten<int>(nsTArray<CopyableTArray<int>>{CopyableTArray<int>{}})) {
+    Unused << item;
+    FAIL();
+  }
+}
+#ifdef __clang__
+#  pragma clang diagnostic pop
+#endif
+
+TEST(Flatten, NestedInnerSingular)
+{
+  nsTArray<int> flattened;
+  for (const auto& item :
+       Flatten<int>(nsTArray<CopyableTArray<int>>{CopyableTArray<int>{1}})) {
+    flattened.AppendElement(item);
+  }
+
+  EXPECT_EQ(nsTArray{1}, flattened);
+}
+
+TEST(Flatten, NestedInnerSingulars)
+{
+  nsTArray<int> flattened;
+  for (const auto& item : Flatten<int>(nsTArray<CopyableTArray<int>>{
+           CopyableTArray<int>{1}, CopyableTArray<int>{2}})) {
+    flattened.AppendElement(item);
+  }
+
+  EXPECT_EQ((nsTArray<int>{{1, 2}}), flattened);
+}
+
+TEST(Flatten, NestedInnerNonSingulars)
+{
+  nsTArray<int> flattened;
+  for (const auto& item : Flatten<int>(nsTArray<CopyableTArray<int>>{
+           CopyableTArray<int>{1, 2}, CopyableTArray<int>{3, 4}})) {
+    flattened.AppendElement(item);
+  }
+
+  EXPECT_EQ((nsTArray<int>{{1, 2, 3, 4}}), flattened);
+}
+
+}  // namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/TestForwardDecls.cpp b/dom/quota/test/gtest/TestForwardDecls.cpp
new file mode 100644
index 0000000000..223f83af03
--- /dev/null
+++ b/dom/quota/test/gtest/TestForwardDecls.cpp
@@ -0,0 +1,12 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <type_traits>
+#include "mozilla/dom/quota/ForwardDecls.h"
+
+using namespace mozilla;
+
+static_assert(std::is_same_v<OkOrErr, Result<Ok, QMResult>>);
diff --git a/dom/quota/test/gtest/TestOriginParser.cpp b/dom/quota/test/gtest/TestOriginParser.cpp
new file mode 100644
index 0000000000..5cd4d2682b
--- /dev/null
+++ b/dom/quota/test/gtest/TestOriginParser.cpp
@@ -0,0 +1,25 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "OriginParser.h"
+
+#include "gtest/gtest.h"
+
+using namespace mozilla::dom::quota;
+
+TEST(OriginParser_IsUUIDOrigin, Valid)
+{ EXPECT_TRUE(IsUUIDOrigin("uuid://1ef9867c-e754-4303-a18b-684f0321f6e2"_ns)); }
+
+TEST(OriginParser_IsUUIDOrigin, Invalid)
+{
+  EXPECT_FALSE(IsUUIDOrigin("Invalid UUID Origin"_ns));
+
+  EXPECT_FALSE(IsUUIDOrigin("1ef9867c-e754-4303-a18b-684f0321f6e2"_ns));
+
+  EXPECT_FALSE(IsUUIDOrigin("uuid://1ef9867c-e754-4303-a18b"_ns));
+
+  EXPECT_FALSE(IsUUIDOrigin("uuid+++1ef9867c-e754-4303-a18b-684f0321f6e2"_ns));
+}
diff --git a/dom/quota/test/gtest/TestOriginScope.cpp b/dom/quota/test/gtest/TestOriginScope.cpp
new file mode 100644
index 0000000000..4afb45c1b4
--- /dev/null
+++ b/dom/quota/test/gtest/TestOriginScope.cpp
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/dom/quota/OriginScope.h"
+#include "nsStringFwd.h"
+#include "nsTDependentString.h"
+#include "nsTLiteralString.h"
+
+namespace mozilla::dom::quota {
+
+namespace {
+
+struct OriginTest {
+  const char* mOrigin;
+  bool mMatch;
+};
+
+void CheckOriginScopeMatchesOrigin(const OriginScope& aOriginScope,
+                                   const char* aOrigin, bool aMatch) {
+  bool result = aOriginScope.Matches(
+      OriginScope::FromOrigin(nsDependentCString(aOrigin)));
+
+  EXPECT_TRUE(result == aMatch);
+}
+
+}  // namespace
+
+TEST(DOM_Quota_OriginScope, SanityChecks)
+{
+  OriginScope originScope;
+
+  // Sanity checks.
+
+  {
+    constexpr auto origin = "http://www.mozilla.org"_ns;
+    originScope.SetFromOrigin(origin);
+    EXPECT_TRUE(originScope.IsOrigin());
+    EXPECT_TRUE(originScope.GetOrigin().Equals(origin));
+    EXPECT_TRUE(originScope.GetOriginNoSuffix().Equals(origin));
+  }
+
+  {
+    constexpr auto prefix = "http://www.mozilla.org"_ns;
+    originScope.SetFromPrefix(prefix);
+    EXPECT_TRUE(originScope.IsPrefix());
+    EXPECT_TRUE(originScope.GetOriginNoSuffix().Equals(prefix));
+  }
+
+  {
+    originScope.SetFromNull();
+    EXPECT_TRUE(originScope.IsNull());
+  }
+}
+
+TEST(DOM_Quota_OriginScope, MatchesOrigin)
+{
+  OriginScope originScope;
+
+  // Test each origin scope type against particular origins.
+
+  {
+    originScope.SetFromOrigin("http://www.mozilla.org"_ns);
+
+    static const OriginTest tests[] = {
+        {"http://www.mozilla.org", true},
+        {"http://www.example.org", false},
+    };
+
+    for (const auto& test : tests) {
+      CheckOriginScopeMatchesOrigin(originScope, test.mOrigin, test.mMatch);
+    }
+  }
+
+  {
+    originScope.SetFromPrefix("http://www.mozilla.org"_ns);
+
+    static const OriginTest tests[] = {
+        {"http://www.mozilla.org", true},
+        {"http://www.mozilla.org^userContextId=1", true},
+        {"http://www.example.org^userContextId=1", false},
+    };
+
+    for (const auto& test : tests) {
+      CheckOriginScopeMatchesOrigin(originScope, test.mOrigin, test.mMatch);
+    }
+  }
+
+  {
+    originScope.SetFromNull();
+
+    static const OriginTest tests[] = {
+        {"http://www.mozilla.org", true},
+        {"http://www.mozilla.org^userContextId=1", true},
+        {"http://www.example.org^userContextId=1", true},
+    };
+
+    for (const auto& test : tests) {
+      CheckOriginScopeMatchesOrigin(originScope, test.mOrigin, test.mMatch);
+    }
+  }
+}
+
+}  //  namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/TestPersistenceType.cpp b/dom/quota/test/gtest/TestPersistenceType.cpp
new file mode 100644
index 0000000000..c4f1e5d581
--- /dev/null
+++ b/dom/quota/test/gtest/TestPersistenceType.cpp
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/PersistenceType.h"
+
+#include "gtest/gtest.h"
+
+#include "nsDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsIFile.h"
+
+namespace mozilla::dom::quota {
+
+TEST(PersistenceType, FromFile)
+{
+  nsCOMPtr<nsIFile> base;
+  nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(base));
+  EXPECT_EQ(rv, NS_OK);
+
+  const auto testPersistenceType = [&base](const nsLiteralString& aString,
+                                           const Maybe<PersistenceType> aType) {
+    nsCOMPtr<nsIFile> file;
+
+    nsresult rv = base->Clone(getter_AddRefs(file));
+    EXPECT_EQ(rv, NS_OK);
+
+    rv = file->Append(aString);
+    EXPECT_EQ(rv, NS_OK);
+
+    auto maybePersistenceType = PersistenceTypeFromFile(*file, fallible);
+    EXPECT_EQ(maybePersistenceType, aType);
+  };
+
+  testPersistenceType(u"permanent"_ns, Some(PERSISTENCE_TYPE_PERSISTENT));
+  testPersistenceType(u"temporary"_ns, Some(PERSISTENCE_TYPE_TEMPORARY));
+  testPersistenceType(u"default"_ns, Some(PERSISTENCE_TYPE_DEFAULT));
+  testPersistenceType(u"persistent"_ns, Nothing());
+  testPersistenceType(u"foobar"_ns, Nothing());
+}
+
+}  // namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/TestQMResult.cpp b/dom/quota/test/gtest/TestQMResult.cpp
new file mode 100644
index 0000000000..94cbec7364
--- /dev/null
+++ b/dom/quota/test/gtest/TestQMResult.cpp
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Common.h"
+#include "gtest/gtest.h"
+#include "mozilla/dom/QMResult.h"
+
+using namespace mozilla;
+using namespace mozilla::dom::quota;
+
+class DOM_Quota_QMResult : public DOM_Quota_Test {};
+
+#ifdef QM_ERROR_STACKS_ENABLED
+TEST_F(DOM_Quota_QMResult, Construct_Default) {
+  QMResult res;
+
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(res.StackId(), ExpectedStackId());
+  ASSERT_EQ(res.FrameId(), 1u);
+  ASSERT_EQ(res.NSResult(), NS_OK);
+}
+#endif
+
+TEST_F(DOM_Quota_QMResult, Construct_FromNSResult) {
+  QMResult res(NS_ERROR_FAILURE);
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(res.StackId(), ExpectedStackId());
+  ASSERT_EQ(res.FrameId(), 1u);
+  ASSERT_EQ(res.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(res, NS_ERROR_FAILURE);
+#endif
+}
+
+#ifdef QM_ERROR_STACKS_ENABLED
+TEST_F(DOM_Quota_QMResult, Propagate) {
+  QMResult res1(NS_ERROR_FAILURE);
+
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(res1.StackId(), ExpectedStackId());
+  ASSERT_EQ(res1.FrameId(), 1u);
+  ASSERT_EQ(res1.NSResult(), NS_ERROR_FAILURE);
+
+  QMResult res2 = res1.Propagate();
+
+  ASSERT_EQ(res2.StackId(), ExpectedStackId());
+  ASSERT_EQ(res2.FrameId(), 2u);
+  ASSERT_EQ(res2.NSResult(), NS_ERROR_FAILURE);
+}
+#endif
+
+TEST_F(DOM_Quota_QMResult, ToQMResult) {
+  auto res = ToQMResult(NS_ERROR_FAILURE);
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(res.StackId(), ExpectedStackId());
+  ASSERT_EQ(res.FrameId(), 1u);
+  ASSERT_EQ(res.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(res, NS_ERROR_FAILURE);
+#endif
+}
diff --git a/dom/quota/test/gtest/TestQuotaCommon.cpp b/dom/quota/test/gtest/TestQuotaCommon.cpp
new file mode 100644
index 0000000000..2367f08cd6
--- /dev/null
+++ b/dom/quota/test/gtest/TestQuotaCommon.cpp
@@ -0,0 +1,2288 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/QuotaCommon.h"
+
+#include "gtest/gtest.h"
+
+#include <algorithm>
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <map>
+#include <new>
+#include <ostream>
+#include <type_traits>
+#include <utility>
+#include <vector>
+#include "ErrorList.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/Unused.h"
+#include "mozilla/fallible.h"
+#include "mozilla/dom/quota/QuotaTestParent.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+#include "nsCOMPtr.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsIFile.h"
+#include "nsLiteralString.h"
+#include "nsString.h"
+#include "nsStringFwd.h"
+#include "nsTLiteralString.h"
+
+class nsISupports;
+
+namespace mozilla::dom::quota {
+
+namespace {
+
+void CheckUnknownFileEntry(nsIFile& aBase, const nsAString& aName,
+                           const bool aWarnIfFile, const bool aWarnIfDir) {
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBase.Clone(getter_AddRefs(file));
+  ASSERT_EQ(rv, NS_OK);
+
+  rv = file->Append(aName);
+  ASSERT_EQ(rv, NS_OK);
+
+  rv = file->Create(nsIFile::NORMAL_FILE_TYPE, 0600);
+  ASSERT_EQ(rv, NS_OK);
+
+  auto okOrErr = WARN_IF_FILE_IS_UNKNOWN(*file);
+  ASSERT_TRUE(okOrErr.isOk());
+
+#ifdef DEBUG
+  EXPECT_TRUE(okOrErr.inspect() == aWarnIfFile);
+#else
+  EXPECT_TRUE(okOrErr.inspect() == false);
+#endif
+
+  rv = file->Remove(false);
+  ASSERT_EQ(rv, NS_OK);
+
+  rv = file->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  ASSERT_EQ(rv, NS_OK);
+
+  okOrErr = WARN_IF_FILE_IS_UNKNOWN(*file);
+  ASSERT_TRUE(okOrErr.isOk());
+
+#ifdef DEBUG
+  EXPECT_TRUE(okOrErr.inspect() == aWarnIfDir);
+#else
+  EXPECT_TRUE(okOrErr.inspect() == false);
+#endif
+
+  rv = file->Remove(false);
+  ASSERT_EQ(rv, NS_OK);
+}
+
+}  // namespace
+
+TEST(QuotaCommon_WarnIfFileIsUnknown, Basics)
+{
+  nsCOMPtr<nsIFile> base;
+  nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(base));
+  ASSERT_EQ(rv, NS_OK);
+
+  rv = base->Append(u"mozquotatests"_ns);
+  ASSERT_EQ(rv, NS_OK);
+
+  base->Remove(true);
+
+  rv = base->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  ASSERT_EQ(rv, NS_OK);
+
+  CheckUnknownFileEntry(*base, u"foo.bar"_ns, true, true);
+  CheckUnknownFileEntry(*base, u".DS_Store"_ns, false, true);
+  CheckUnknownFileEntry(*base, u".desktop"_ns, false, true);
+  CheckUnknownFileEntry(*base, u"desktop.ini"_ns, false, true);
+  CheckUnknownFileEntry(*base, u"DESKTOP.INI"_ns, false, true);
+  CheckUnknownFileEntry(*base, u"thumbs.db"_ns, false, true);
+  CheckUnknownFileEntry(*base, u"THUMBS.DB"_ns, false, true);
+  CheckUnknownFileEntry(*base, u".xyz"_ns, false, true);
+
+  rv = base->Remove(true);
+  ASSERT_EQ(rv, NS_OK);
+}
+
+mozilla::ipc::IPCResult QuotaTestParent::RecvTry_Success_CustomErr_QmIpcFail(
+    bool* aTryDidNotReturn) {
+  QM_TRY(MOZ_TO_RESULT(NS_OK), QM_IPC_FAIL(this));
+
+  *aTryDidNotReturn = true;
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult QuotaTestParent::RecvTry_Success_CustomErr_IpcFail(
+    bool* aTryDidNotReturn) {
+  QM_TRY(MOZ_TO_RESULT(NS_OK), IPC_FAIL(this, "Custom why"));
+
+  *aTryDidNotReturn = true;
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult
+QuotaTestParent::RecvTryInspect_Success_CustomErr_QmIpcFail(
+    bool* aTryDidNotReturn) {
+  QM_TRY_INSPECT(const auto& x, (mozilla::Result<int32_t, nsresult>{42}),
+                 QM_IPC_FAIL(this));
+  Unused << x;
+
+  *aTryDidNotReturn = true;
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult
+QuotaTestParent::RecvTryInspect_Success_CustomErr_IpcFail(
+    bool* aTryDidNotReturn) {
+  QM_TRY_INSPECT(const auto& x, (mozilla::Result<int32_t, nsresult>{42}),
+                 IPC_FAIL(this, "Custom why"));
+  Unused << x;
+
+  *aTryDidNotReturn = true;
+
+  return IPC_OK();
+}
+
+#ifdef __clang__
+#  pragma clang diagnostic push
+#  pragma clang diagnostic ignored "-Wunreachable-code"
+#endif
+
+TEST(QuotaCommon_Try, Success)
+{
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, Success_CustomErr_QmIpcFail)
+{
+  auto foo = MakeRefPtr<QuotaTestParent>();
+
+  bool tryDidNotReturn = false;
+
+  auto res = foo->RecvTry_Success_CustomErr_QmIpcFail(&tryDidNotReturn);
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_TRUE(res);
+}
+
+TEST(QuotaCommon_Try, Success_CustomErr_IpcFail)
+{
+  auto foo = MakeRefPtr<QuotaTestParent>();
+
+  bool tryDidNotReturn = false;
+
+  auto res = foo->RecvTry_Success_CustomErr_IpcFail(&tryDidNotReturn);
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_TRUE(res);
+}
+
+#ifdef DEBUG
+TEST(QuotaCommon_Try, Success_CustomErr_AssertUnreachable)
+{
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_OK), QM_ASSERT_UNREACHABLE);
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, Success_NoErr_AssertUnreachable)
+{
+  bool tryDidNotReturn = false;
+
+  [&tryDidNotReturn]() -> void {
+    QM_TRY(MOZ_TO_RESULT(NS_OK), QM_ASSERT_UNREACHABLE_VOID);
+
+    tryDidNotReturn = true;
+  }();
+
+  EXPECT_TRUE(tryDidNotReturn);
+}
+#else
+#  if defined(QM_ASSERT_UNREACHABLE) || defined(QM_ASSERT_UNREACHABLE_VOID)
+#error QM_ASSERT_UNREACHABLE and QM_ASSERT_UNREACHABLE_VOID should not be defined.
+#  endif
+#endif
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+TEST(QuotaCommon_Try, Success_CustomErr_DiagnosticAssertUnreachable)
+{
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_OK), QM_DIAGNOSTIC_ASSERT_UNREACHABLE);
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, Success_NoErr_DiagnosticAssertUnreachable)
+{
+  bool tryDidNotReturn = false;
+
+  [&tryDidNotReturn]() -> void {
+    QM_TRY(MOZ_TO_RESULT(NS_OK), QM_DIAGNOSTIC_ASSERT_UNREACHABLE_VOID);
+
+    tryDidNotReturn = true;
+  }();
+
+  EXPECT_TRUE(tryDidNotReturn);
+}
+#else
+#  if defined(QM_DIAGNOSTIC_ASSERT_UNREACHABLE) || \
+      defined(QM_DIAGNOSTIC_ASSERT_UNREACHABLE_VOID)
+#error QM_DIAGNOSTIC_ASSERT_UNREACHABLE and QM_DIAGNOSTIC_ASSERT_UNREACHABLE_VOID should not be defined.
+#  endif
+#endif
+
+TEST(QuotaCommon_Try, Success_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                                 \
+  {                                                                  \
+    bool tryDidNotReturn = false;                                    \
+                                                                     \
+    nsresult rv = [&tryDidNotReturn]() -> nsresult {                 \
+      QM_TRY(MOZ_TO_RESULT(NS_OK), [](__VA_ARGS__) { return aRv; }); \
+                                                                     \
+      tryDidNotReturn = true;                                        \
+                                                                     \
+      return NS_OK;                                                  \
+    }();                                                             \
+                                                                     \
+    EXPECT_TRUE(tryDidNotReturn);                                    \
+    EXPECT_EQ(rv, NS_OK);                                            \
+  }
+
+  SUBTEST(const char*, nsresult aRv);
+  SUBTEST(nsresult aRv);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_Try, Success_WithCleanup)
+{
+  bool tryCleanupRan = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryCleanupRan, &tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_OK), QM_PROPAGATE,
+           [&tryCleanupRan](const auto&) { tryCleanupRan = true; });
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryCleanupRan);
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, Failure_PropagateErr)
+{
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Try, Failure_CustomErr)
+{
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), NS_ERROR_UNEXPECTED);
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_Try, Failure_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                           \
+  {                                                            \
+    bool tryDidNotReturn = false;                              \
+                                                               \
+    nsresult rv = [&tryDidNotReturn]() -> nsresult {           \
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE),                  \
+             [](__VA_ARGS__) { return NS_ERROR_UNEXPECTED; }); \
+                                                               \
+      tryDidNotReturn = true;                                  \
+                                                               \
+      return NS_OK;                                            \
+    }();                                                       \
+                                                               \
+    EXPECT_FALSE(tryDidNotReturn);                             \
+    EXPECT_EQ(rv, NS_ERROR_UNEXPECTED);                        \
+  }
+
+  SUBTEST(const char* aFunc, nsresult);
+  SUBTEST(nsresult rv);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_Try, Failure_NoErr)
+{
+  bool tryDidNotReturn = false;
+
+  [&tryDidNotReturn]() -> void {
+    QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), QM_VOID);
+
+    tryDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryDidNotReturn);
+}
+
+TEST(QuotaCommon_Try, Failure_WithCleanup)
+{
+  bool tryCleanupRan = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&tryCleanupRan, &tryDidNotReturn]() -> nsresult {
+    QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), QM_PROPAGATE,
+           [&tryCleanupRan](const auto& result) {
+             EXPECT_EQ(result, NS_ERROR_FAILURE);
+
+             tryCleanupRan = true;
+           });
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryCleanupRan);
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Try, Failure_WithCleanup_UnwrapErr)
+{
+  bool tryCleanupRan = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv;
+
+  [&tryCleanupRan, &tryDidNotReturn](nsresult& aRv) -> void {
+    QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), QM_VOID,
+           ([&tryCleanupRan, &aRv](auto& result) {
+             EXPECT_EQ(result, NS_ERROR_FAILURE);
+
+             aRv = result;
+
+             tryCleanupRan = true;
+           }));
+
+    tryDidNotReturn = true;
+
+    aRv = NS_OK;
+  }(rv);
+
+  EXPECT_TRUE(tryCleanupRan);
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Try, Failure_WithCleanupAndPredicate)
+{
+  auto predicate = []() {
+    static bool calledOnce = false;
+    const bool result = !calledOnce;
+    calledOnce = true;
+    return result;
+  };
+
+  {
+    bool tryDidNotReturn = false;
+
+    nsresult rv = [&predicate, &tryDidNotReturn]() -> nsresult {
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), QM_PROPAGATE, QM_NO_CLEANUP,
+             predicate);
+
+      tryDidNotReturn = true;
+
+      return NS_OK;
+    }();
+
+    EXPECT_FALSE(tryDidNotReturn);
+    EXPECT_EQ(rv, NS_ERROR_FAILURE);
+  }
+
+  {
+    bool tryDidNotReturn = false;
+
+    nsresult rv = [&predicate, &tryDidNotReturn]() -> nsresult {
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE), QM_PROPAGATE, QM_NO_CLEANUP,
+             predicate);
+
+      tryDidNotReturn = true;
+
+      return NS_OK;
+    }();
+
+    EXPECT_FALSE(tryDidNotReturn);
+    EXPECT_EQ(rv, NS_ERROR_FAILURE);
+  }
+}
+
+TEST(QuotaCommon_Try, SameLine)
+{
+  // clang-format off
+  QM_TRY(MOZ_TO_RESULT(NS_OK), QM_VOID); QM_TRY(MOZ_TO_RESULT(NS_OK), QM_VOID);
+  // clang-format on
+}
+
+TEST(QuotaCommon_Try, NestingMadness_Success)
+{
+  bool nestedTryDidNotReturn = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&nestedTryDidNotReturn, &tryDidNotReturn]() -> nsresult {
+    QM_TRY(([&nestedTryDidNotReturn]() -> Result<Ok, nsresult> {
+      QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+      nestedTryDidNotReturn = true;
+
+      return Ok();
+    }()));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTryDidNotReturn);
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, NestingMadness_Failure)
+{
+  bool nestedTryDidNotReturn = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&nestedTryDidNotReturn, &tryDidNotReturn]() -> nsresult {
+    QM_TRY(([&nestedTryDidNotReturn]() -> Result<Ok, nsresult> {
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE));
+
+      nestedTryDidNotReturn = true;
+
+      return Ok();
+    }()));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(nestedTryDidNotReturn);
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Try, NestingMadness_Multiple_Success)
+{
+  bool nestedTry1DidNotReturn = false;
+  bool nestedTry2DidNotReturn = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&nestedTry1DidNotReturn, &nestedTry2DidNotReturn,
+                 &tryDidNotReturn]() -> nsresult {
+    QM_TRY(([&nestedTry1DidNotReturn,
+             &nestedTry2DidNotReturn]() -> Result<Ok, nsresult> {
+      QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+      nestedTry1DidNotReturn = true;
+
+      QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+      nestedTry2DidNotReturn = true;
+
+      return Ok();
+    }()));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTry1DidNotReturn);
+  EXPECT_TRUE(nestedTry2DidNotReturn);
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_Try, NestingMadness_Multiple_Failure1)
+{
+  bool nestedTry1DidNotReturn = false;
+  bool nestedTry2DidNotReturn = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&nestedTry1DidNotReturn, &nestedTry2DidNotReturn,
+                 &tryDidNotReturn]() -> nsresult {
+    QM_TRY(([&nestedTry1DidNotReturn,
+             &nestedTry2DidNotReturn]() -> Result<Ok, nsresult> {
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE));
+
+      nestedTry1DidNotReturn = true;
+
+      QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+      nestedTry2DidNotReturn = true;
+
+      return Ok();
+    }()));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(nestedTry1DidNotReturn);
+  EXPECT_FALSE(nestedTry2DidNotReturn);
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Try, NestingMadness_Multiple_Failure2)
+{
+  bool nestedTry1DidNotReturn = false;
+  bool nestedTry2DidNotReturn = false;
+  bool tryDidNotReturn = false;
+
+  nsresult rv = [&nestedTry1DidNotReturn, &nestedTry2DidNotReturn,
+                 &tryDidNotReturn]() -> nsresult {
+    QM_TRY(([&nestedTry1DidNotReturn,
+             &nestedTry2DidNotReturn]() -> Result<Ok, nsresult> {
+      QM_TRY(MOZ_TO_RESULT(NS_OK));
+
+      nestedTry1DidNotReturn = true;
+
+      QM_TRY(MOZ_TO_RESULT(NS_ERROR_FAILURE));
+
+      nestedTry2DidNotReturn = true;
+
+      return Ok();
+    }()));
+
+    tryDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTry1DidNotReturn);
+  EXPECT_FALSE(nestedTry2DidNotReturn);
+  EXPECT_FALSE(tryDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, Success)
+{
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}));
+    EXPECT_EQ(x, 42);
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_TryInspect, Success_CustomErr_QmIpcFail)
+{
+  auto foo = MakeRefPtr<QuotaTestParent>();
+
+  bool tryDidNotReturn = false;
+
+  auto res = foo->RecvTryInspect_Success_CustomErr_QmIpcFail(&tryDidNotReturn);
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_TRUE(res);
+}
+
+TEST(QuotaCommon_TryInspect, Success_CustomErr_IpcFail)
+{
+  auto foo = MakeRefPtr<QuotaTestParent>();
+
+  bool tryDidNotReturn = false;
+
+  auto res = foo->RecvTryInspect_Success_CustomErr_IpcFail(&tryDidNotReturn);
+
+  EXPECT_TRUE(tryDidNotReturn);
+  EXPECT_TRUE(res);
+}
+
+#ifdef DEBUG
+TEST(QuotaCommon_TryInspect, Success_CustomErr_AssertUnreachable)
+{
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}),
+                   QM_ASSERT_UNREACHABLE);
+    EXPECT_EQ(x, 42);
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_TryInspect, Success_NoErr_AssertUnreachable)
+{
+  bool tryInspectDidNotReturn = false;
+
+  [&tryInspectDidNotReturn]() -> void {
+    QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}),
+                   QM_ASSERT_UNREACHABLE_VOID);
+    EXPECT_EQ(x, 42);
+
+    tryInspectDidNotReturn = true;
+  }();
+
+  EXPECT_TRUE(tryInspectDidNotReturn);
+}
+#endif
+
+TEST(QuotaCommon_TryInspect, Success_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                                 \
+  {                                                                  \
+    bool tryInspectDidNotReturn = false;                             \
+                                                                     \
+    nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {          \
+      QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}), \
+                     [](__VA_ARGS__) { return aRv; });               \
+      EXPECT_EQ(x, 42);                                              \
+                                                                     \
+      tryInspectDidNotReturn = true;                                 \
+                                                                     \
+      return NS_OK;                                                  \
+    }();                                                             \
+                                                                     \
+    EXPECT_TRUE(tryInspectDidNotReturn);                             \
+    EXPECT_EQ(rv, NS_OK);                                            \
+  }
+
+  SUBTEST(const char*, nsresult aRv);
+  SUBTEST(nsresult aRv);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_TryInspect, Success_WithCleanup)
+{
+  bool tryInspectCleanupRan = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectCleanupRan, &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& x, (Result<int32_t, nsresult>{42}), QM_PROPAGATE,
+        [&tryInspectCleanupRan](const auto&) { tryInspectCleanupRan = true; });
+    EXPECT_EQ(x, 42);
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryInspectCleanupRan);
+  EXPECT_TRUE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_TryInspect, Failure_PropagateErr)
+{
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(const auto& x,
+                   (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, Failure_CustomErr)
+{
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(const auto& x,
+                   (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}),
+                   NS_ERROR_UNEXPECTED);
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_TryInspect, Failure_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                                     \
+  {                                                                      \
+    bool tryInspectDidNotReturn = false;                                 \
+                                                                         \
+    nsresult rv = [&tryInspectDidNotReturn]() -> nsresult {              \
+      QM_TRY_INSPECT(const auto& x,                                      \
+                     (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}), \
+                     [](__VA_ARGS__) { return NS_ERROR_UNEXPECTED; });   \
+      Unused << x;                                                       \
+                                                                         \
+      tryInspectDidNotReturn = true;                                     \
+                                                                         \
+      return NS_OK;                                                      \
+    }();                                                                 \
+                                                                         \
+    EXPECT_FALSE(tryInspectDidNotReturn);                                \
+    EXPECT_EQ(rv, NS_ERROR_UNEXPECTED);                                  \
+  }
+
+  SUBTEST(const char*, nsresult);
+  SUBTEST(nsresult);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_TryInspect, Failure_NoErr)
+{
+  bool tryInspectDidNotReturn = false;
+
+  [&tryInspectDidNotReturn]() -> void {
+    QM_TRY_INSPECT(const auto& x,
+                   (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}), QM_VOID);
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryInspectDidNotReturn);
+}
+
+TEST(QuotaCommon_TryInspect, Failure_WithCleanup)
+{
+  bool tryInspectCleanupRan = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&tryInspectCleanupRan, &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(const auto& x,
+                   (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}),
+                   QM_PROPAGATE, [&tryInspectCleanupRan](const auto& result) {
+                     EXPECT_EQ(result, NS_ERROR_FAILURE);
+
+                     tryInspectCleanupRan = true;
+                   });
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(tryInspectCleanupRan);
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, Failure_WithCleanup_UnwrapErr)
+{
+  bool tryInspectCleanupRan = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv;
+
+  [&tryInspectCleanupRan, &tryInspectDidNotReturn](nsresult& aRv) -> void {
+    QM_TRY_INSPECT(const auto& x,
+                   (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}), QM_VOID,
+                   ([&tryInspectCleanupRan, &aRv](auto& result) {
+                     EXPECT_EQ(result, NS_ERROR_FAILURE);
+
+                     aRv = result;
+
+                     tryInspectCleanupRan = true;
+                   }));
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+
+    aRv = NS_OK;
+  }(rv);
+
+  EXPECT_TRUE(tryInspectCleanupRan);
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, ConstDecl)
+{
+  QM_TRY_INSPECT(const int32_t& x, (Result<int32_t, nsresult>{42}), QM_VOID);
+
+  static_assert(std::is_same_v<decltype(x), const int32_t&>);
+
+  EXPECT_EQ(x, 42);
+}
+
+TEST(QuotaCommon_TryInspect, SameScopeDecl)
+{
+  QM_TRY_INSPECT(const int32_t& x, (Result<int32_t, nsresult>{42}), QM_VOID);
+  EXPECT_EQ(x, 42);
+
+  QM_TRY_INSPECT(const int32_t& y, (Result<int32_t, nsresult>{42}), QM_VOID);
+  EXPECT_EQ(y, 42);
+}
+
+TEST(QuotaCommon_TryInspect, SameLine)
+{
+  // clang-format off
+  QM_TRY_INSPECT(const auto &x, (Result<int32_t, nsresult>{42}), QM_VOID); QM_TRY_INSPECT(const auto &y, (Result<int32_t, nsresult>{42}), QM_VOID);
+  // clang-format on
+
+  EXPECT_EQ(x, 42);
+  EXPECT_EQ(y, 42);
+}
+
+TEST(QuotaCommon_TryInspect, NestingMadness_Success)
+{
+  bool nestedTryInspectDidNotReturn = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&nestedTryInspectDidNotReturn,
+                 &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& x,
+        ([&nestedTryInspectDidNotReturn]() -> Result<int32_t, nsresult> {
+          QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}));
+
+          nestedTryInspectDidNotReturn = true;
+
+          return x;
+        }()));
+    EXPECT_EQ(x, 42);
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTryInspectDidNotReturn);
+  EXPECT_TRUE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_TryInspect, NestingMadness_Failure)
+{
+  bool nestedTryInspectDidNotReturn = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&nestedTryInspectDidNotReturn,
+                 &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& x,
+        ([&nestedTryInspectDidNotReturn]() -> Result<int32_t, nsresult> {
+          QM_TRY_INSPECT(const auto& x,
+                         (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+
+          nestedTryInspectDidNotReturn = true;
+
+          return x;
+        }()));
+    Unused << x;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(nestedTryInspectDidNotReturn);
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, NestingMadness_Multiple_Success)
+{
+  bool nestedTryInspect1DidNotReturn = false;
+  bool nestedTryInspect2DidNotReturn = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&nestedTryInspect1DidNotReturn, &nestedTryInspect2DidNotReturn,
+                 &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& z,
+        ([&nestedTryInspect1DidNotReturn,
+          &nestedTryInspect2DidNotReturn]() -> Result<int32_t, nsresult> {
+          QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}));
+
+          nestedTryInspect1DidNotReturn = true;
+
+          QM_TRY_INSPECT(const auto& y, (Result<int32_t, nsresult>{42}));
+
+          nestedTryInspect2DidNotReturn = true;
+
+          return x + y;
+        }()));
+    EXPECT_EQ(z, 84);
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTryInspect1DidNotReturn);
+  EXPECT_TRUE(nestedTryInspect2DidNotReturn);
+  EXPECT_TRUE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_OK);
+}
+
+TEST(QuotaCommon_TryInspect, NestingMadness_Multiple_Failure1)
+{
+  bool nestedTryInspect1DidNotReturn = false;
+  bool nestedTryInspect2DidNotReturn = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&nestedTryInspect1DidNotReturn, &nestedTryInspect2DidNotReturn,
+                 &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& z,
+        ([&nestedTryInspect1DidNotReturn,
+          &nestedTryInspect2DidNotReturn]() -> Result<int32_t, nsresult> {
+          QM_TRY_INSPECT(const auto& x,
+                         (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+
+          nestedTryInspect1DidNotReturn = true;
+
+          QM_TRY_INSPECT(const auto& y, (Result<int32_t, nsresult>{42}));
+
+          nestedTryInspect2DidNotReturn = true;
+
+          return x + y;
+        }()));
+    Unused << z;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(nestedTryInspect1DidNotReturn);
+  EXPECT_FALSE(nestedTryInspect2DidNotReturn);
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryInspect, NestingMadness_Multiple_Failure2)
+{
+  bool nestedTryInspect1DidNotReturn = false;
+  bool nestedTryInspect2DidNotReturn = false;
+  bool tryInspectDidNotReturn = false;
+
+  nsresult rv = [&nestedTryInspect1DidNotReturn, &nestedTryInspect2DidNotReturn,
+                 &tryInspectDidNotReturn]() -> nsresult {
+    QM_TRY_INSPECT(
+        const auto& z,
+        ([&nestedTryInspect1DidNotReturn,
+          &nestedTryInspect2DidNotReturn]() -> Result<int32_t, nsresult> {
+          QM_TRY_INSPECT(const auto& x, (Result<int32_t, nsresult>{42}));
+
+          nestedTryInspect1DidNotReturn = true;
+
+          QM_TRY_INSPECT(const auto& y,
+                         (Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+
+          nestedTryInspect2DidNotReturn = true;
+
+          return x + y;
+        }()));
+    Unused << z;
+
+    tryInspectDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(nestedTryInspect1DidNotReturn);
+  EXPECT_FALSE(nestedTryInspect2DidNotReturn);
+  EXPECT_FALSE(tryInspectDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+// We are not repeating all QM_TRY_INSPECT test cases for QM_TRY_UNWRAP, since
+// they are largely based on the same implementation. We just add some where
+// inspecting and unwrapping differ.
+
+TEST(QuotaCommon_TryUnwrap, NonConstDecl)
+{
+  QM_TRY_UNWRAP(int32_t x, (Result<int32_t, nsresult>{42}), QM_VOID);
+
+  static_assert(std::is_same_v<decltype(x), int32_t>);
+
+  EXPECT_EQ(x, 42);
+}
+
+TEST(QuotaCommon_TryUnwrap, RvalueDecl)
+{
+  QM_TRY_UNWRAP(int32_t && x, (Result<int32_t, nsresult>{42}), QM_VOID);
+
+  static_assert(std::is_same_v<decltype(x), int32_t&&>);
+
+  EXPECT_EQ(x, 42);
+}
+
+TEST(QuotaCommon_TryUnwrap, ParenDecl)
+{
+  QM_TRY_UNWRAP(
+      (auto&& [x, y]),
+      (Result<std::pair<int32_t, bool>, nsresult>{std::pair{42, true}}),
+      QM_VOID);
+
+  static_assert(std::is_same_v<decltype(x), int32_t>);
+  static_assert(std::is_same_v<decltype(y), bool>);
+
+  EXPECT_EQ(x, 42);
+  EXPECT_EQ(y, true);
+}
+
+TEST(QuotaCommon_TryReturn, Success)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn] {
+    QM_TRY_RETURN((Result<int32_t, nsresult>{42}));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_TryReturn, Success_nsresult)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn] {
+    QM_TRY_RETURN(MOZ_TO_RESULT(NS_OK));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isOk());
+}
+
+#ifdef DEBUG
+TEST(QuotaCommon_TryReturn, Success_CustomErr_AssertUnreachable)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn]() -> Result<int32_t, nsresult> {
+    QM_TRY_RETURN((Result<int32_t, nsresult>{42}), QM_ASSERT_UNREACHABLE);
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+#endif
+
+TEST(QuotaCommon_TryReturn, Success_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                                \
+  {                                                                 \
+    bool tryReturnDidNotReturn = false;                             \
+                                                                    \
+    auto res = [&tryReturnDidNotReturn]() -> Result<Ok, nsresult> { \
+      QM_TRY_RETURN(MOZ_TO_RESULT(NS_OK),                           \
+                    [](__VA_ARGS__) { return Err(aRv); });          \
+                                                                    \
+      tryReturnDidNotReturn = true;                                 \
+    }();                                                            \
+                                                                    \
+    EXPECT_FALSE(tryReturnDidNotReturn);                            \
+    EXPECT_TRUE(res.isOk());                                        \
+  }
+
+  SUBTEST(const char*, nsresult aRv);
+  SUBTEST(nsresult aRv);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_TryReturn, Success_WithCleanup)
+{
+  bool tryReturnCleanupRan = false;
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnCleanupRan,
+              &tryReturnDidNotReturn]() -> Result<int32_t, nsresult> {
+    QM_TRY_RETURN(
+        (Result<int32_t, nsresult>{42}), QM_PROPAGATE,
+        [&tryReturnCleanupRan](const auto&) { tryReturnCleanupRan = true; });
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnCleanupRan);
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_TryReturn, Failure_PropagateErr)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn] {
+    QM_TRY_RETURN((Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryReturn, Failure_PropagateErr_nsresult)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn] {
+    QM_TRY_RETURN(MOZ_TO_RESULT(NS_ERROR_FAILURE));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryReturn, Failure_CustomErr)
+{
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnDidNotReturn]() -> Result<int32_t, nsresult> {
+    QM_TRY_RETURN((Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}),
+                  Err(NS_ERROR_UNEXPECTED));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_TryReturn, Failure_CustomErr_CustomLambda)
+{
+#define SUBTEST(...)                                                       \
+  {                                                                        \
+    bool tryReturnDidNotReturn = false;                                    \
+                                                                           \
+    auto res = [&tryReturnDidNotReturn]() -> Result<int32_t, nsresult> {   \
+      QM_TRY_RETURN((Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}),    \
+                    [](__VA_ARGS__) { return Err(NS_ERROR_UNEXPECTED); }); \
+                                                                           \
+      tryReturnDidNotReturn = true;                                        \
+    }();                                                                   \
+                                                                           \
+    EXPECT_FALSE(tryReturnDidNotReturn);                                   \
+    EXPECT_TRUE(res.isErr());                                              \
+    EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);                       \
+  }
+
+  SUBTEST(const char*, nsresult);
+  SUBTEST(nsresult);
+
+#undef SUBTEST
+}
+
+TEST(QuotaCommon_TryReturn, Failure_WithCleanup)
+{
+  bool tryReturnCleanupRan = false;
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&tryReturnCleanupRan,
+              &tryReturnDidNotReturn]() -> Result<int32_t, nsresult> {
+    QM_TRY_RETURN((Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}),
+                  QM_PROPAGATE, [&tryReturnCleanupRan](const auto& result) {
+                    EXPECT_EQ(result, NS_ERROR_FAILURE);
+
+                    tryReturnCleanupRan = true;
+                  });
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_TRUE(tryReturnCleanupRan);
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_TryReturn, SameLine)
+{
+  // clang-format off
+  auto res1 = [] { QM_TRY_RETURN((Result<int32_t, nsresult>{42})); }(); auto res2 = []() -> Result<int32_t, nsresult> { QM_TRY_RETURN((Result<int32_t, nsresult>{42})); }();
+  // clang-format on
+
+  EXPECT_TRUE(res1.isOk());
+  EXPECT_EQ(res1.unwrap(), 42);
+  EXPECT_TRUE(res2.isOk());
+  EXPECT_EQ(res2.unwrap(), 42);
+}
+
+TEST(QuotaCommon_TryReturn, NestingMadness_Success)
+{
+  bool nestedTryReturnDidNotReturn = false;
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&nestedTryReturnDidNotReturn, &tryReturnDidNotReturn] {
+    QM_TRY_RETURN(([&nestedTryReturnDidNotReturn] {
+      QM_TRY_RETURN((Result<int32_t, nsresult>{42}));
+
+      nestedTryReturnDidNotReturn = true;
+    }()));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(nestedTryReturnDidNotReturn);
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_TryReturn, NestingMadness_Failure)
+{
+  bool nestedTryReturnDidNotReturn = false;
+  bool tryReturnDidNotReturn = false;
+
+  auto res = [&nestedTryReturnDidNotReturn, &tryReturnDidNotReturn] {
+    QM_TRY_RETURN(([&nestedTryReturnDidNotReturn] {
+      QM_TRY_RETURN((Result<int32_t, nsresult>{Err(NS_ERROR_FAILURE)}));
+
+      nestedTryReturnDidNotReturn = true;
+    }()));
+
+    tryReturnDidNotReturn = true;
+  }();
+
+  EXPECT_FALSE(nestedTryReturnDidNotReturn);
+  EXPECT_FALSE(tryReturnDidNotReturn);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Fail, ReturnValue)
+{
+  bool failDidNotReturn = false;
+
+  nsresult rv = [&failDidNotReturn]() -> nsresult {
+    QM_FAIL(NS_ERROR_FAILURE);
+
+    failDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_FALSE(failDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_Fail, ReturnValue_WithCleanup)
+{
+  bool failCleanupRan = false;
+  bool failDidNotReturn = false;
+
+  nsresult rv = [&failCleanupRan, &failDidNotReturn]() -> nsresult {
+    QM_FAIL(NS_ERROR_FAILURE, [&failCleanupRan]() { failCleanupRan = true; });
+
+    failDidNotReturn = true;
+
+    return NS_OK;
+  }();
+
+  EXPECT_TRUE(failCleanupRan);
+  EXPECT_FALSE(failDidNotReturn);
+  EXPECT_EQ(rv, NS_ERROR_FAILURE);
+}
+
+TEST(QuotaCommon_WarnOnlyTry, Success)
+{
+  bool warnOnlyTryDidNotReturn = false;
+
+  const auto res =
+      [&warnOnlyTryDidNotReturn]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY(OkIf(true));
+
+    warnOnlyTryDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTry, Success_WithCleanup)
+{
+  bool warnOnlyTryCleanupRan = false;
+  bool warnOnlyTryDidNotReturn = false;
+
+  const auto res =
+      [&warnOnlyTryCleanupRan,
+       &warnOnlyTryDidNotReturn]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY(OkIf(true), [&warnOnlyTryCleanupRan](const auto&) {
+      warnOnlyTryCleanupRan = true;
+    });
+
+    warnOnlyTryDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_FALSE(warnOnlyTryCleanupRan);
+  EXPECT_TRUE(warnOnlyTryDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTry, Failure)
+{
+  bool warnOnlyTryDidNotReturn = false;
+
+  const auto res =
+      [&warnOnlyTryDidNotReturn]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY(OkIf(false));
+
+    warnOnlyTryDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTry, Failure_WithCleanup)
+{
+  bool warnOnlyTryCleanupRan = false;
+  bool warnOnlyTryDidNotReturn = false;
+
+  const auto res =
+      [&warnOnlyTryCleanupRan,
+       &warnOnlyTryDidNotReturn]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY(OkIf(false), ([&warnOnlyTryCleanupRan](const auto&) {
+                      warnOnlyTryCleanupRan = true;
+                    }));
+
+    warnOnlyTryDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryCleanupRan);
+  EXPECT_TRUE(warnOnlyTryDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTryUnwrap, Success)
+{
+  bool warnOnlyTryUnwrapDidNotReturn = false;
+
+  const auto res = [&warnOnlyTryUnwrapDidNotReturn]()
+      -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY_UNWRAP(const auto x, (Result<int32_t, NotOk>{42}));
+    EXPECT_TRUE(x);
+    EXPECT_EQ(*x, 42);
+
+    warnOnlyTryUnwrapDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryUnwrapDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTryUnwrap, Success_WithCleanup)
+{
+  bool warnOnlyTryUnwrapCleanupRan = false;
+  bool warnOnlyTryUnwrapDidNotReturn = false;
+
+  const auto res = [&warnOnlyTryUnwrapCleanupRan,
+                    &warnOnlyTryUnwrapDidNotReturn]()
+      -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY_UNWRAP(const auto x, (Result<int32_t, NotOk>{42}),
+                           [&warnOnlyTryUnwrapCleanupRan](const auto&) {
+                             warnOnlyTryUnwrapCleanupRan = true;
+                           });
+    EXPECT_TRUE(x);
+    EXPECT_EQ(*x, 42);
+
+    warnOnlyTryUnwrapDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_FALSE(warnOnlyTryUnwrapCleanupRan);
+  EXPECT_TRUE(warnOnlyTryUnwrapDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTryUnwrap, Failure)
+{
+  bool warnOnlyTryUnwrapDidNotReturn = false;
+
+  const auto res = [&warnOnlyTryUnwrapDidNotReturn]()
+      -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY_UNWRAP(const auto x,
+                           (Result<int32_t, NotOk>{Err(NotOk{})}));
+    EXPECT_FALSE(x);
+
+    warnOnlyTryUnwrapDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryUnwrapDidNotReturn);
+}
+
+TEST(QuotaCommon_WarnOnlyTryUnwrap, Failure_WithCleanup)
+{
+  bool warnOnlyTryUnwrapCleanupRan = false;
+  bool warnOnlyTryUnwrapDidNotReturn = false;
+
+  const auto res = [&warnOnlyTryUnwrapCleanupRan,
+                    &warnOnlyTryUnwrapDidNotReturn]()
+      -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_WARNONLY_TRY_UNWRAP(const auto x, (Result<int32_t, NotOk>{Err(NotOk{})}),
+                           [&warnOnlyTryUnwrapCleanupRan](const auto&) {
+                             warnOnlyTryUnwrapCleanupRan = true;
+                           });
+    EXPECT_FALSE(x);
+
+    warnOnlyTryUnwrapDidNotReturn = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(warnOnlyTryUnwrapCleanupRan);
+  EXPECT_TRUE(warnOnlyTryUnwrapDidNotReturn);
+}
+
+TEST(QuotaCommon_OrElseWarn, Success)
+{
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN(OkIf(true), ([&fallbackRun](const NotOk) {
+                             fallbackRun = true;
+                             return mozilla::Result<mozilla::Ok, NotOk>{
+                                 mozilla::Ok{}};
+                           })));
+
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_FALSE(fallbackRun);
+  EXPECT_TRUE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarn, Failure_MappedToSuccess)
+{
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  // XXX Consider allowing to set a custom error handler, so that we can
+  // actually assert that a warning was emitted.
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN(OkIf(false), ([&fallbackRun](const NotOk) {
+                             fallbackRun = true;
+                             return mozilla::Result<mozilla::Ok, NotOk>{
+                                 mozilla::Ok{}};
+                           })));
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(fallbackRun);
+  EXPECT_TRUE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarn, Failure_MappedToError)
+{
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  // XXX Consider allowing to set a custom error handler, so that we can
+  // actually assert that a warning was emitted.
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN(OkIf(false), ([&fallbackRun](const NotOk) {
+                             fallbackRun = true;
+                             return mozilla::Result<mozilla::Ok, NotOk>{
+                                 NotOk{}};
+                           })));
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_TRUE(fallbackRun);
+  EXPECT_FALSE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarnIf, Success)
+{
+  bool predicateRun = false;
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN_IF(
+        OkIf(true),
+        [&predicateRun](const NotOk) {
+          predicateRun = true;
+          return false;
+        },
+        ([&fallbackRun](const NotOk) {
+          fallbackRun = true;
+          return mozilla::Result<mozilla::Ok, NotOk>{mozilla::Ok{}};
+        })));
+
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_FALSE(predicateRun);
+  EXPECT_FALSE(fallbackRun);
+  EXPECT_TRUE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarnIf, Failure_PredicateReturnsFalse)
+{
+  bool predicateRun = false;
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN_IF(
+        OkIf(false),
+        [&predicateRun](const NotOk) {
+          predicateRun = true;
+          return false;
+        },
+        ([&fallbackRun](const NotOk) {
+          fallbackRun = true;
+          return mozilla::Result<mozilla::Ok, NotOk>{mozilla::Ok{}};
+        })));
+
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_TRUE(predicateRun);
+  EXPECT_FALSE(fallbackRun);
+  EXPECT_FALSE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarnIf, Failure_PredicateReturnsTrue_MappedToSuccess)
+{
+  bool predicateRun = false;
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN_IF(
+        OkIf(false),
+        [&predicateRun](const NotOk) {
+          predicateRun = true;
+          return true;
+        },
+        ([&fallbackRun](const NotOk) {
+          fallbackRun = true;
+          return mozilla::Result<mozilla::Ok, NotOk>{mozilla::Ok{}};
+        })));
+
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_TRUE(predicateRun);
+  EXPECT_TRUE(fallbackRun);
+  EXPECT_TRUE(tryContinued);
+}
+
+TEST(QuotaCommon_OrElseWarnIf, Failure_PredicateReturnsTrue_MappedToError)
+{
+  bool predicateRun = false;
+  bool fallbackRun = false;
+  bool tryContinued = false;
+
+  const auto res = [&]() -> mozilla::Result<mozilla::Ok, NotOk> {
+    QM_TRY(QM_OR_ELSE_WARN_IF(
+        OkIf(false),
+        [&predicateRun](const NotOk) {
+          predicateRun = true;
+          return true;
+        },
+        ([&fallbackRun](const NotOk) {
+          fallbackRun = true;
+          return mozilla::Result<mozilla::Ok, NotOk>{mozilla::NotOk{}};
+        })));
+
+    tryContinued = true;
+    return mozilla::Ok{};
+  }();
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_TRUE(predicateRun);
+  EXPECT_TRUE(fallbackRun);
+  EXPECT_FALSE(tryContinued);
+}
+
+TEST(QuotaCommon_OkIf, True)
+{
+  auto res = OkIf(true);
+
+  EXPECT_TRUE(res.isOk());
+}
+
+TEST(QuotaCommon_OkIf, False)
+{
+  auto res = OkIf(false);
+
+  EXPECT_TRUE(res.isErr());
+}
+
+TEST(QuotaCommon_OkToOk, Bool_True)
+{
+  auto res = OkToOk<true>(Ok());
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), true);
+}
+
+TEST(QuotaCommon_OkToOk, Bool_False)
+{
+  auto res = OkToOk<false>(Ok());
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), false);
+}
+
+TEST(QuotaCommon_OkToOk, Int_42)
+{
+  auto res = OkToOk<42>(Ok());
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Bool_True)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, true>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), true);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Bool_True_Err)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, true>(NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Bool_False)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, false>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), false);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Bool_False_Err)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, false>(NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Int_42)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, 42>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, Int_42_Err)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, 42>(NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, NsCOMPtr_nullptr)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, nullptr, nsCOMPtr<nsISupports>>(
+      NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), nullptr);
+}
+
+TEST(QuotaCommon_ErrToOkOrErr, NsCOMPtr_nullptr_Err)
+{
+  auto res = ErrToOkOrErr<NS_ERROR_FAILURE, nullptr, nsCOMPtr<nsISupports>>(
+      NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_ErrToDefaultOkOrErr, Ok)
+{
+  auto res = ErrToDefaultOkOrErr<NS_ERROR_FAILURE, Ok>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+}
+
+TEST(QuotaCommon_ErrToDefaultOkOrErr, Ok_Err)
+{
+  auto res = ErrToDefaultOkOrErr<NS_ERROR_FAILURE, Ok>(NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_ErrToDefaultOkOrErr, NsCOMPtr)
+{
+  auto res = ErrToDefaultOkOrErr<NS_ERROR_FAILURE, nsCOMPtr<nsISupports>>(
+      NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), nullptr);
+}
+
+TEST(QuotaCommon_ErrToDefaultOkOrErr, NsCOMPtr_Err)
+{
+  auto res = ErrToDefaultOkOrErr<NS_ERROR_FAILURE, nsCOMPtr<nsISupports>>(
+      NS_ERROR_UNEXPECTED);
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_UNEXPECTED);
+}
+
+TEST(QuotaCommon_IsSpecificError, Match)
+{ EXPECT_TRUE(IsSpecificError<NS_ERROR_FAILURE>(NS_ERROR_FAILURE)); }
+
+TEST(QuotaCommon_IsSpecificError, Mismatch)
+{ EXPECT_FALSE(IsSpecificError<NS_ERROR_FAILURE>(NS_ERROR_UNEXPECTED)); }
+
+TEST(QuotaCommon_ErrToOk, Bool_True)
+{
+  auto res = ErrToOk<true>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), true);
+}
+
+TEST(QuotaCommon_ErrToOk, Bool_False)
+{
+  auto res = ErrToOk<false>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), false);
+}
+
+TEST(QuotaCommon_ErrToOk, Int_42)
+{
+  auto res = ErrToOk<42>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(QuotaCommon_ErrToOk, NsCOMPtr_nullptr)
+{
+  auto res = ErrToOk<nullptr, nsCOMPtr<nsISupports>>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), nullptr);
+}
+
+TEST(QuotaCommon_ErrToDefaultOk, Ok)
+{
+  auto res = ErrToDefaultOk<Ok>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+}
+
+TEST(QuotaCommon_ErrToDefaultOk, NsCOMPtr)
+{
+  auto res = ErrToDefaultOk<nsCOMPtr<nsISupports>>(NS_ERROR_FAILURE);
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), nullptr);
+}
+
+class StringPairParameterized
+    : public ::testing::TestWithParam<std::pair<const char*, const char*>> {};
+
+TEST_P(StringPairParameterized, AnonymizedOriginString) {
+  const auto [in, expectedAnonymized] = GetParam();
+  const auto anonymized = AnonymizedOriginString(nsDependentCString(in));
+  EXPECT_STREQ(anonymized.get(), expectedAnonymized);
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    QuotaCommon, StringPairParameterized,
+    ::testing::Values(
+        // XXX Do we really want to anonymize about: origins?
+        std::pair("about:home", "about:aaaa"),
+        std::pair("https://foo.bar.com", "https://aaa.aaa.aaa"),
+        std::pair("https://foo.bar.com:8000", "https://aaa.aaa.aaa:DDDD"),
+        std::pair("file://UNIVERSAL_FILE_ORIGIN",
+                  "file://aaaaaaaaa_aaaa_aaaaaa")));
+
+// BEGIN COPY FROM mfbt/tests/TestResult.cpp
+struct Failed {};
+
+static GenericErrorResult<Failed> Fail() { return Err(Failed()); }
+
+static Result<Ok, Failed> Task1(bool pass) {
+  if (!pass) {
+    return Fail();  // implicit conversion from GenericErrorResult to Result
+  }
+  return Ok();
+}
+// END COPY FROM mfbt/tests/TestResult.cpp
+
+static Result<bool, Failed> Condition(bool aNoError, bool aResult) {
+  return Task1(aNoError).map([aResult](auto) { return aResult; });
+}
+
+TEST(QuotaCommon_CollectWhileTest, NoFailures)
+{
+  const size_t loopCount = 5;
+  size_t conditionExecutions = 0;
+  size_t bodyExecutions = 0;
+  auto result = CollectWhile(
+      [&conditionExecutions] {
+        ++conditionExecutions;
+        return Condition(true, conditionExecutions <= loopCount);
+      },
+      [&bodyExecutions] {
+        ++bodyExecutions;
+        return Task1(true);
+      });
+  static_assert(std::is_same_v<decltype(result), Result<Ok, Failed>>);
+  MOZ_RELEASE_ASSERT(result.isOk());
+  MOZ_RELEASE_ASSERT(loopCount == bodyExecutions);
+  MOZ_RELEASE_ASSERT(1 + loopCount == conditionExecutions);
+}
+
+TEST(QuotaCommon_CollectWhileTest, BodyFailsImmediately)
+{
+  size_t conditionExecutions = 0;
+  size_t bodyExecutions = 0;
+  auto result = CollectWhile(
+      [&conditionExecutions] {
+        ++conditionExecutions;
+        return Condition(true, true);
+      },
+      [&bodyExecutions] {
+        ++bodyExecutions;
+        return Task1(false);
+      });
+  static_assert(std::is_same_v<decltype(result), Result<Ok, Failed>>);
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(1 == bodyExecutions);
+  MOZ_RELEASE_ASSERT(1 == conditionExecutions);
+}
+
+TEST(QuotaCommon_CollectWhileTest, BodyFailsOnSecondExecution)
+{
+  size_t conditionExecutions = 0;
+  size_t bodyExecutions = 0;
+  auto result = CollectWhile(
+      [&conditionExecutions] {
+        ++conditionExecutions;
+        return Condition(true, true);
+      },
+      [&bodyExecutions] {
+        ++bodyExecutions;
+        return Task1(bodyExecutions < 2);
+      });
+  static_assert(std::is_same_v<decltype(result), Result<Ok, Failed>>);
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(2 == bodyExecutions);
+  MOZ_RELEASE_ASSERT(2 == conditionExecutions);
+}
+
+TEST(QuotaCommon_CollectWhileTest, ConditionFailsImmediately)
+{
+  size_t conditionExecutions = 0;
+  size_t bodyExecutions = 0;
+  auto result = CollectWhile(
+      [&conditionExecutions] {
+        ++conditionExecutions;
+        return Condition(false, true);
+      },
+      [&bodyExecutions] {
+        ++bodyExecutions;
+        return Task1(true);
+      });
+  static_assert(std::is_same_v<decltype(result), Result<Ok, Failed>>);
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(0 == bodyExecutions);
+  MOZ_RELEASE_ASSERT(1 == conditionExecutions);
+}
+
+TEST(QuotaCommon_CollectWhileTest, ConditionFailsOnSecondExecution)
+{
+  size_t conditionExecutions = 0;
+  size_t bodyExecutions = 0;
+  auto result = CollectWhile(
+      [&conditionExecutions] {
+        ++conditionExecutions;
+        return Condition(conditionExecutions < 2, true);
+      },
+      [&bodyExecutions] {
+        ++bodyExecutions;
+        return Task1(true);
+      });
+  static_assert(std::is_same_v<decltype(result), Result<Ok, Failed>>);
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(1 == bodyExecutions);
+  MOZ_RELEASE_ASSERT(2 == conditionExecutions);
+}
+
+TEST(QuotaCommon_CollectEachInRange, Success)
+{
+  size_t bodyExecutions = 0;
+  const auto result = CollectEachInRange(
+      std::array<int, 5>{{1, 2, 3, 4, 5}},
+      [&bodyExecutions](const int val) -> Result<Ok, nsresult> {
+        ++bodyExecutions;
+        return Ok{};
+      });
+
+  MOZ_RELEASE_ASSERT(result.isOk());
+  MOZ_RELEASE_ASSERT(5 == bodyExecutions);
+}
+
+TEST(QuotaCommon_CollectEachInRange, FailureShortCircuit)
+{
+  size_t bodyExecutions = 0;
+  const auto result = CollectEachInRange(
+      std::array<int, 5>{{1, 2, 3, 4, 5}},
+      [&bodyExecutions](const int val) -> Result<Ok, nsresult> {
+        ++bodyExecutions;
+        return val == 3 ? Err(NS_ERROR_FAILURE) : Result<Ok, nsresult>{Ok{}};
+      });
+
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(NS_ERROR_FAILURE == result.inspectErr());
+  MOZ_RELEASE_ASSERT(3 == bodyExecutions);
+}
+
+TEST(QuotaCommon_ReduceEach, Success)
+{
+  const auto result = ReduceEach(
+      [i = int{0}]() mutable -> Result<int, Failed> {
+        if (i < 5) {
+          return ++i;
+        }
+        return 0;
+      },
+      0, [](int val, int add) -> Result<int, Failed> { return val + add; });
+  static_assert(std::is_same_v<decltype(result), const Result<int, Failed>>);
+
+  MOZ_RELEASE_ASSERT(result.isOk());
+  MOZ_RELEASE_ASSERT(15 == result.inspect());
+}
+
+TEST(QuotaCommon_ReduceEach, StepError)
+{
+  const auto result = ReduceEach(
+      [i = int{0}]() mutable -> Result<int, Failed> {
+        if (i < 5) {
+          return ++i;
+        }
+        return 0;
+      },
+      0,
+      [](int val, int add) -> Result<int, Failed> {
+        if (val > 2) {
+          return Err(Failed{});
+        }
+        return val + add;
+      });
+  static_assert(std::is_same_v<decltype(result), const Result<int, Failed>>);
+
+  MOZ_RELEASE_ASSERT(result.isErr());
+}
+
+TEST(QuotaCommon_ReduceEach, GeneratorError)
+{
+  size_t generatorExecutions = 0;
+  const auto result = ReduceEach(
+      [i = int{0}, &generatorExecutions]() mutable -> Result<int, Failed> {
+        ++generatorExecutions;
+        if (i < 1) {
+          return ++i;
+        }
+        return Err(Failed{});
+      },
+      0,
+      [](int val, int add) -> Result<int, Failed> {
+        if (val > 2) {
+          return Err(Failed{});
+        }
+        return val + add;
+      });
+  static_assert(std::is_same_v<decltype(result), const Result<int, Failed>>);
+
+  MOZ_RELEASE_ASSERT(result.isErr());
+  MOZ_RELEASE_ASSERT(2 == generatorExecutions);
+}
+
+TEST(QuotaCommon_Reduce, Success)
+{
+  const auto range = std::vector{0, 1, 2, 3, 4, 5};
+  const auto result = Reduce(
+      range, 0, [](int val, Maybe<const int&> add) -> Result<int, Failed> {
+        return val + add.ref();
+      });
+  static_assert(std::is_same_v<decltype(result), const Result<int, Failed>>);
+
+  MOZ_RELEASE_ASSERT(result.isOk());
+  MOZ_RELEASE_ASSERT(15 == result.inspect());
+}
+
+TEST(QuotaCommon_CallWithDelayedRetriesIfAccessDenied, NoFailures)
+{
+  uint32_t tries = 0;
+
+  auto res = CallWithDelayedRetriesIfAccessDenied(
+      [&tries]() -> Result<Ok, nsresult> {
+        ++tries;
+        return Ok{};
+      },
+      10, 2);
+
+  EXPECT_EQ(tries, 1u);
+  EXPECT_TRUE(res.isOk());
+}
+
+TEST(QuotaCommon_CallWithDelayedRetriesIfAccessDenied, PermanentFailures)
+{
+  uint32_t tries = 0;
+
+  auto res = CallWithDelayedRetriesIfAccessDenied(
+      [&tries]() -> Result<Ok, nsresult> {
+        ++tries;
+        return Err(NS_ERROR_FILE_IS_LOCKED);
+      },
+      10, 2);
+
+  EXPECT_EQ(tries, 11u);
+  EXPECT_TRUE(res.isErr());
+}
+
+TEST(QuotaCommon_CallWithDelayedRetriesIfAccessDenied, FailuresAndSuccess)
+{
+  uint32_t tries = 0;
+
+  auto res = CallWithDelayedRetriesIfAccessDenied(
+      [&tries]() -> Result<Ok, nsresult> {
+        if (++tries == 5) {
+          return Ok{};
+        }
+        return Err(NS_ERROR_FILE_ACCESS_DENIED);
+      },
+      10, 2);
+
+  EXPECT_EQ(tries, 5u);
+  EXPECT_TRUE(res.isOk());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, ThisSourceFile)
+{
+  static constexpr auto thisSourceFileRelativePath =
+      "dom/quota/test/gtest/TestQuotaCommon.cpp"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          nsLiteralCString(__FILE__))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(), thisSourceFileRelativePath.get());
+}
+
+static nsCString MakeTreePath(const nsACString& aBasePath,
+                              const nsACString& aRelativePath) {
+  nsCString path{aBasePath};
+
+  path.Append("/");
+  path.Append(aRelativePath);
+
+  return path;
+}
+
+static nsCString MakeSourceTreePath(const nsACString& aRelativePath) {
+  return MakeTreePath(mozilla::dom::quota::detail::GetSourceTreeBase(),
+                      aRelativePath);
+}
+
+static nsCString MakeObjdirDistIncludeTreePath(
+    const nsACString& aRelativePath) {
+  return MakeTreePath(
+      mozilla::dom::quota::detail::GetObjdirDistIncludeTreeBase(),
+      aRelativePath);
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, DomQuotaSourceFile)
+{
+  static constexpr auto domQuotaSourceFileRelativePath =
+      "dom/quota/ActorsParent.cpp"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          MakeSourceTreePath(domQuotaSourceFileRelativePath))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(),
+               domQuotaSourceFileRelativePath.get());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, DomQuotaSourceFile_Exported)
+{
+  static constexpr auto mozillaDomQuotaSourceFileRelativePath =
+      "mozilla/dom/quota/QuotaCommon.h"_ns;
+
+  static constexpr auto domQuotaSourceFileRelativePath =
+      "dom/quota/QuotaCommon.h"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          MakeObjdirDistIncludeTreePath(
+              mozillaDomQuotaSourceFileRelativePath))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(),
+               domQuotaSourceFileRelativePath.get());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, DomIndexedDBSourceFile)
+{
+  static constexpr auto domIndexedDBSourceFileRelativePath =
+      "dom/indexedDB/ActorsParent.cpp"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          MakeSourceTreePath(domIndexedDBSourceFileRelativePath))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(),
+               domIndexedDBSourceFileRelativePath.get());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath,
+     DomLocalstorageSourceFile_Exported_Mapped)
+{
+  static constexpr auto mozillaDomSourceFileRelativePath =
+      "mozilla/dom/LocalStorageCommon.h"_ns;
+
+  static constexpr auto domLocalstorageSourceFileRelativePath =
+      "dom/localstorage/LocalStorageCommon.h"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          MakeObjdirDistIncludeTreePath(mozillaDomSourceFileRelativePath))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(),
+               domLocalstorageSourceFileRelativePath.get());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, NonDomSourceFile)
+{
+  static constexpr auto nonDomSourceFileRelativePath =
+      "storage/mozStorageService.cpp"_ns;
+
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          MakeSourceTreePath(nonDomSourceFileRelativePath))};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(),
+               nonDomSourceFileRelativePath.get());
+}
+
+TEST(QuotaCommon_MakeSourceFileRelativePath, OtherSourceFile)
+{
+  constexpr auto otherSourceFilePath = "/foo/bar/Test.cpp"_ns;
+  const nsCString sourceFileRelativePath{
+      mozilla::dom::quota::detail::MakeSourceFileRelativePath(
+          otherSourceFilePath)};
+
+  EXPECT_STREQ(sourceFileRelativePath.get(), "Test.cpp");
+}
+
+#ifdef __clang__
+#  pragma clang diagnostic pop
+#endif
+
+}  // namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/TestQuotaManager.cpp b/dom/quota/test/gtest/TestQuotaManager.cpp
new file mode 100644
index 0000000000..c93f18ca61
--- /dev/null
+++ b/dom/quota/test/gtest/TestQuotaManager.cpp
@@ -0,0 +1,1611 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/SpinEventLoopUntil.h"
+#include "mozilla/dom/quota/DirectoryLock.h"
+#include "mozilla/dom/quota/OriginScope.h"
+#include "mozilla/dom/quota/QuotaManager.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "QuotaManagerDependencyFixture.h"
+
+namespace mozilla::dom::quota::test {
+
+class TestQuotaManager : public QuotaManagerDependencyFixture {
+ public:
+  static void SetUpTestCase() { ASSERT_NO_FATAL_FAILURE(InitializeFixture()); }
+
+  static void TearDownTestCase() { ASSERT_NO_FATAL_FAILURE(ShutdownFixture()); }
+};
+
+// Test OpenStorageDirectory when an opening of the storage directory is
+// already ongoing and storage shutdown is scheduled after that.
+TEST_F(TestQuotaManager, OpenStorageDirectory_OngoingWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<UniversalDirectoryLock> directoryLock;
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(
+        quotaManager
+            ->OpenStorageDirectory(
+                Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+                OriginScope::FromNull(), Nullable<Client::Type>(),
+                /* aExclusive */ false)
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [&directoryLock](
+                       UniversalDirectoryLockPromise::ResolveOrRejectValue&&
+                           aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     [&aValue]() { ASSERT_TRUE(aValue.ResolveValue()); }();
+
+                     directoryLock = std::move(aValue.ResolveValue());
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   })
+            ->Then(quotaManager->IOThread(), __func__,
+                   [](const BoolPromise::ResolveOrRejectValue& aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     []() {
+                       QuotaManager* quotaManager = QuotaManager::Get();
+                       ASSERT_TRUE(quotaManager);
+
+                       ASSERT_TRUE(
+                           quotaManager->IsStorageInitializedInternal());
+                     }();
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   })
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [&directoryLock](
+                       const BoolPromise::ResolveOrRejectValue& aValue) {
+                     directoryLock = nullptr;
+
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(
+        quotaManager
+            ->OpenStorageDirectory(
+                Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+                OriginScope::FromNull(), Nullable<Client::Type>(),
+                /* aExclusive */ false)
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenStorageDirectory when an opening of the storage directory is
+// already ongoing and an exclusive directory lock is requested after that.
+TEST_F(TestQuotaManager,
+       OpenStorageDirectory_OngoingWithExclusiveDirectoryLock) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<UniversalDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLockInternal(Nullable<PersistenceType>(),
+                                                  OriginScope::FromNull(),
+                                                  Nullable<Client::Type>(),
+                                                  /* aExclusive */ true);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(
+        quotaManager
+            ->OpenStorageDirectory(
+                Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+                OriginScope::FromNull(), Nullable<Client::Type>(),
+                /* aExclusive */ false)
+            ->Then(
+                GetCurrentSerialEventTarget(), __func__,
+                [&directoryLock](
+                    const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+                  directoryLock = nullptr;
+
+                  if (aValue.IsReject()) {
+                    return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                        __func__);
+                  }
+
+                  return BoolPromise::CreateAndResolve(true, __func__);
+                }));
+    promises.AppendElement(directoryLock->Acquire());
+    promises.AppendElement(
+        quotaManager
+            ->OpenStorageDirectory(
+                Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+                OriginScope::FromNull(), Nullable<Client::Type>(),
+                /* aExclusive */ false)
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenStorageDirectory when an opening of the storage directory already
+// finished.
+TEST_F(TestQuotaManager, OpenStorageDirectory_Finished) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager
+        ->OpenStorageDirectory(
+            Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+            OriginScope::FromNull(), Nullable<Client::Type>(),
+            /* aExclusive */ false)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager
+        ->OpenStorageDirectory(
+            Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+            OriginScope::FromNull(), Nullable<Client::Type>(),
+            /* aExclusive */ false)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenStorageDirectory when an opening of the storage directory already
+// finished but storage shutdown has just been scheduled.
+TEST_F(TestQuotaManager, OpenStorageDirectory_FinishedWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager
+        ->OpenStorageDirectory(
+            Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+            OriginScope::FromNull(), Nullable<Client::Type>(),
+            /* aExclusive */ false)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(
+        quotaManager
+            ->OpenStorageDirectory(
+                Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+                OriginScope::FromNull(), Nullable<Client::Type>(),
+                /* aExclusive */ false)
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenStorageDirectory when an opening of the storage directory already
+// finished and an exclusive client directory lock for a non-overlapping
+// origin is acquired in between.
+TEST_F(TestQuotaManager,
+       OpenStorageDirectory_FinishedWithExclusiveClientDirectoryLock) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager
+        ->OpenStorageDirectory(
+            Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+            OriginScope::FromNull(), Nullable<Client::Type>(),
+            /* aExclusive */ false)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ true);
+
+    done = false;
+
+    directoryLock->Acquire()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager
+        ->OpenStorageDirectory(
+            Nullable<PersistenceType>(PERSISTENCE_TYPE_PERSISTENT),
+            OriginScope::FromNull(), Nullable<Client::Type>(),
+            /* aExclusive */ false)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const UniversalDirectoryLockPromise::ResolveOrRejectValue&
+                        aValue) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenClientDirctory when an opening of a client directory is already
+// ongoing and storage shutdown is scheduled after that.
+TEST_F(TestQuotaManager, OpenClientDirectory_OngoingWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock;
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(
+        quotaManager->OpenClientDirectory(GetTestClientMetadata())
+            ->Then(
+                GetCurrentSerialEventTarget(), __func__,
+                [&directoryLock](
+                    ClientDirectoryLockPromise::ResolveOrRejectValue&& aValue) {
+                  if (aValue.IsReject()) {
+                    return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                        __func__);
+                  }
+
+                  [&aValue]() { ASSERT_TRUE(aValue.ResolveValue()); }();
+
+                  directoryLock = std::move(aValue.ResolveValue());
+
+                  return BoolPromise::CreateAndResolve(true, __func__);
+                })
+            ->Then(quotaManager->IOThread(), __func__,
+                   [](const BoolPromise::ResolveOrRejectValue& aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     []() {
+                       QuotaManager* quotaManager = QuotaManager::Get();
+                       ASSERT_TRUE(quotaManager);
+
+                       ASSERT_TRUE(
+                           quotaManager->IsStorageInitializedInternal());
+                     }();
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   })
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [&directoryLock](
+                       const BoolPromise::ResolveOrRejectValue& aValue) {
+                     directoryLock = nullptr;
+
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(
+        quotaManager->OpenClientDirectory(GetTestClientMetadata())
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenClientDirectory when an opening of a client directory is already
+// ongoing and an exclusive directory lock is requested after that.
+TEST_F(TestQuotaManager,
+       OpenClientDirectory_OngoingWithExclusiveDirectoryLock) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<UniversalDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLockInternal(Nullable<PersistenceType>(),
+                                                  OriginScope::FromNull(),
+                                                  Nullable<Client::Type>(),
+                                                  /* aExclusive */ true);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(
+        quotaManager->OpenClientDirectory(GetTestClientMetadata())
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [&directoryLock](
+                       const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                     directoryLock = nullptr;
+
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+    promises.AppendElement(directoryLock->Acquire());
+    promises.AppendElement(
+        quotaManager->OpenClientDirectory(GetTestClientMetadata())
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenClientDirectory when an opening of a client directory already
+// finished.
+TEST_F(TestQuotaManager, OpenClientDirectory_Finished) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->OpenClientDirectory(GetTestClientMetadata())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                 QuotaManager* quotaManager = QuotaManager::Get();
+                 ASSERT_TRUE(quotaManager);
+
+                 ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager->OpenClientDirectory(GetTestClientMetadata())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                 QuotaManager* quotaManager = QuotaManager::Get();
+                 ASSERT_TRUE(quotaManager);
+
+                 ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenClientDirectory when an opening of a client directory already
+// finished but storage shutdown has just been scheduled.
+TEST_F(TestQuotaManager, OpenClientDirectory_FinishedWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->OpenClientDirectory(GetTestClientMetadata())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                 QuotaManager* quotaManager = QuotaManager::Get();
+                 ASSERT_TRUE(quotaManager);
+
+                 ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(
+        quotaManager->OpenClientDirectory(GetTestClientMetadata())
+            ->Then(GetCurrentSerialEventTarget(), __func__,
+                   [](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                          aValue) {
+                     if (aValue.IsReject()) {
+                       return BoolPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
+                     }
+
+                     return BoolPromise::CreateAndResolve(true, __func__);
+                   }));
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test OpenClientDirectory when an opening of a client directory already
+// finished with an exclusive client directory lock for a different origin is
+// acquired in between.
+TEST_F(TestQuotaManager,
+       OpenClientDirectory_FinishedWithOtherExclusiveClientDirectoryLock) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->OpenClientDirectory(GetTestClientMetadata())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                 QuotaManager* quotaManager = QuotaManager::Get();
+                 ASSERT_TRUE(quotaManager);
+
+                 ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetOtherTestClientMetadata(),
+                                          /* aExclusive */ true);
+
+    done = false;
+
+    directoryLock->Acquire()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager->OpenClientDirectory(GetTestClientMetadata())
+        ->Then(GetCurrentSerialEventTarget(), __func__,
+               [&done](const ClientDirectoryLockPromise::ResolveOrRejectValue&
+                           aValue) {
+                 QuotaManager* quotaManager = QuotaManager::Get();
+                 ASSERT_TRUE(quotaManager);
+
+                 ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+                 done = true;
+               });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test simple InitializeStorage.
+TEST_F(TestQuotaManager, InitializeStorage_Simple) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization is already ongoing.
+TEST_F(TestQuotaManager, InitializeStorage_Ongoing) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization is already ongoing and
+// storage shutdown is scheduled after that.
+TEST_F(TestQuotaManager, InitializeStorage_OngoingWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization is already ongoing and
+// an exclusive directory lock is requested after that.
+TEST_F(TestQuotaManager, InitializeStorage_OngoingWithExclusiveDirectoryLock) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<UniversalDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLockInternal(Nullable<PersistenceType>(),
+                                                  OriginScope::FromNull(),
+                                                  Nullable<Client::Type>(),
+                                                  /* aExclusive */ true);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&directoryLock](const BoolPromise::ResolveOrRejectValue& aValue) {
+          // The exclusive directory lock must be released when the first
+          // storage initialization is finished, otherwise it would endlessly
+          // block the second storage initialization.
+          directoryLock = nullptr;
+
+          if (aValue.IsReject()) {
+            return BoolPromise::CreateAndReject(aValue.RejectValue(), __func__);
+          }
+
+          return BoolPromise::CreateAndResolve(true, __func__);
+        }));
+    promises.AppendElement(directoryLock->Acquire());
+    promises.AppendElement(quotaManager->InitializeStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization is already ongoing and
+// shared client directory locks are requested after that.
+// The shared client directory locks don't have to be released in this case.
+TEST_F(TestQuotaManager, InitializeStorage_OngoingWithClientDirectoryLocks) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    RefPtr<ClientDirectoryLock> directoryLock2 =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock->Acquire());
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock2->Acquire());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization is already ongoing and
+// shared client directory locks are requested after that with storage shutdown
+// scheduled in between.
+TEST_F(TestQuotaManager,
+       InitializeStorage_OngoingWithClientDirectoryLocksAndScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    directoryLock->OnInvalidate(
+        [&directoryLock]() { directoryLock = nullptr; });
+
+    RefPtr<ClientDirectoryLock> directoryLock2 =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock->Acquire());
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock2->Acquire());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization already finished.
+TEST_F(TestQuotaManager, InitializeStorage_Finished) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization already finished but
+// storage shutdown has just been scheduled.
+TEST_F(TestQuotaManager, InitializeStorage_FinishedWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->InitializeStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization already finished and
+// shared client directory locks are requested immediately after requesting
+// storage initialization.
+TEST_F(TestQuotaManager, InitializeStorage_FinishedWithClientDirectoryLocks) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock->Acquire());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    RefPtr<ClientDirectoryLock> directoryLock2 =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    promises.Clear();
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock2->Acquire());
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test InitializeStorage when a storage initialization already finished and
+// shared client directory locks are requested immediatelly after requesting
+// storage initialization with storage shutdown performed in between.
+// The shared client directory lock is released when it gets invalidated by
+// storage shutdown which then unblocks the shutdown.
+TEST_F(TestQuotaManager,
+       InitializeStorage_FinishedWithClientDirectoryLocksAndScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    directoryLock->OnInvalidate(
+        [&directoryLock]() { directoryLock = nullptr; });
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock->Acquire());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    done = false;
+
+    quotaManager->ShutdownStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_FALSE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    RefPtr<ClientDirectoryLock> directoryLock2 =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    promises.Clear();
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(directoryLock2->Acquire());
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+TEST_F(TestQuotaManager,
+       InitializeTemporaryStorage_FinishedWithScheduledShutdown) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  PerformOnBackgroundThread([]() {
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(quotaManager->InitializeTemporaryStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+              ASSERT_TRUE(quotaManager->IsTemporaryStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+
+    promises.Clear();
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(quotaManager->InitializeTemporaryStorage());
+
+    done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_TRUE(quotaManager->IsStorageInitialized());
+              ASSERT_TRUE(quotaManager->IsTemporaryStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test simple ShutdownStorage.
+TEST_F(TestQuotaManager, ShutdownStorage_Simple) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(InitializeStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    bool done = false;
+
+    quotaManager->ShutdownStorage()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [&done](const BoolPromise::ResolveOrRejectValue& aValue) {
+          QuotaManager* quotaManager = QuotaManager::Get();
+          ASSERT_TRUE(quotaManager);
+
+          ASSERT_FALSE(quotaManager->IsStorageInitialized());
+
+          done = true;
+        });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test ShutdownStorage when a storage shutdown is already ongoing.
+TEST_F(TestQuotaManager, ShutdownStorage_Ongoing) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(InitializeStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->ShutdownStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_FALSE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test ShutdownStorage when a storage shutdown is already ongoing and storage
+// initialization is scheduled after that.
+TEST_F(TestQuotaManager, ShutdownStorage_OngoingWithScheduledInitialization) {
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(InitializeStorage());
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageInitialized());
+
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    promises.AppendElement(quotaManager->ShutdownStorage());
+    promises.AppendElement(quotaManager->InitializeStorage());
+    promises.AppendElement(quotaManager->ShutdownStorage());
+
+    bool done = false;
+
+    BoolPromise::All(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](const CopyableTArray<bool>& aResolveValues) {
+              QuotaManager* quotaManager = QuotaManager::Get();
+              ASSERT_TRUE(quotaManager);
+
+              ASSERT_FALSE(quotaManager->IsStorageInitialized());
+
+              done = true;
+            },
+            [&done](nsresult aRejectValue) {
+              ASSERT_TRUE(false);
+
+              done = true;
+            });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+
+  ASSERT_NO_FATAL_FAILURE(AssertStorageNotInitialized());
+
+  ASSERT_NO_FATAL_FAILURE(ShutdownStorage());
+}
+
+// Test ShutdownStorage when a storage shutdown is already ongoing and a shared
+// client directory lock is requested after that.
+// The shared client directory lock doesn't have to be explicitly released
+// because it gets invalidated while it's still pending which causes that any
+// directory locks that were blocked by the shared client directory lock become
+// unblocked.
+TEST_F(TestQuotaManager, ShutdownStorage_OngoingWithClientDirectoryLock) {
+  PerformOnBackgroundThread([]() {
+    QuotaManager* quotaManager = QuotaManager::Get();
+    ASSERT_TRUE(quotaManager);
+
+    RefPtr<ClientDirectoryLock> directoryLock =
+        quotaManager->CreateDirectoryLock(GetTestClientMetadata(),
+                                          /* aExclusive */ false);
+
+    nsTArray<RefPtr<BoolPromise>> promises;
+
+    // This creates an exclusive directory lock internally.
+    promises.AppendElement(quotaManager->ShutdownStorage());
+
+    // This directory lock can't be acquired yet because a storage shutdown
+    // (which uses an exclusive diretory lock internall) is ongoing.
+    promises.AppendElement(directoryLock->Acquire());
+
+    // This second ShutdownStorage invalidates the directoryLock, so that
+    // directory lock can't ever be successfully acquired, the promise for it
+    // will be rejected when the first ShutdownStorage is finished (it releases
+    // its exclusive directory lock);
+    promises.AppendElement(quotaManager->ShutdownStorage());
+
+    bool done = false;
+
+    BoolPromise::AllSettled(GetCurrentSerialEventTarget(), promises)
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [&done](
+                const BoolPromise::AllSettledPromiseType::ResolveOrRejectValue&
+                    aValues) { done = true; });
+
+    SpinEventLoopUntil("Promise is fulfilled"_ns, [&done]() { return done; });
+  });
+}
+
+}  // namespace mozilla::dom::quota::test
diff --git a/dom/quota/test/gtest/TestResultExtensions.cpp b/dom/quota/test/gtest/TestResultExtensions.cpp
new file mode 100644
index 0000000000..137acc1423
--- /dev/null
+++ b/dom/quota/test/gtest/TestResultExtensions.cpp
@@ -0,0 +1,333 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Common.h"
+#include "gtest/gtest.h"
+#include "mozilla/dom/QMResult.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+
+using namespace mozilla;
+using namespace mozilla::dom::quota;
+
+namespace {
+class TestClass {
+ public:
+  static constexpr int kTestValue = 42;
+
+  nsresult NonOverloadedNoInputComplex(std::pair<int, int>* aOut) {
+    *aOut = std::pair{kTestValue, kTestValue};
+    return NS_OK;
+  }
+  nsresult NonOverloadedNoInputFailsComplex(std::pair<int, int>* aOut) {
+    return NS_ERROR_FAILURE;
+  }
+};
+}  // namespace
+
+class DOM_Quota_ResultExtensions_ToResult : public DOM_Quota_Test {};
+class DOM_Quota_ResultExtensions_GenericErrorResult : public DOM_Quota_Test {};
+
+TEST_F(DOM_Quota_ResultExtensions_ToResult, FromBool) {
+  // success
+  {
+    auto res = ToResult(true);
+    static_assert(std::is_same_v<decltype(res), Result<Ok, nsresult>>);
+    EXPECT_TRUE(res.isOk());
+  }
+
+  // failure
+  {
+    auto res = ToResult(false);
+    static_assert(std::is_same_v<decltype(res), Result<Ok, nsresult>>);
+    EXPECT_TRUE(res.isErr());
+    EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+  }
+}
+
+TEST_F(DOM_Quota_ResultExtensions_ToResult, FromQMResult_Failure) {
+  // copy
+  {
+    const auto res = ToQMResult(NS_ERROR_FAILURE);
+    auto okOrErr = ToResult<QMResult>(res);
+    static_assert(std::is_same_v<decltype(okOrErr), OkOrErr>);
+    ASSERT_TRUE(okOrErr.isErr());
+    auto err = okOrErr.unwrapErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+    IncreaseExpectedStackId();
+
+    ASSERT_EQ(err.StackId(), ExpectedStackId());
+    ASSERT_EQ(err.FrameId(), 1u);
+    ASSERT_EQ(err.NSResult(), NS_ERROR_FAILURE);
+#else
+    ASSERT_EQ(err, NS_ERROR_FAILURE);
+#endif
+  }
+
+  // move
+  {
+    auto res = ToQMResult(NS_ERROR_FAILURE);
+    auto okOrErr = ToResult<QMResult>(std::move(res));
+    static_assert(std::is_same_v<decltype(okOrErr), OkOrErr>);
+    ASSERT_TRUE(okOrErr.isErr());
+    auto err = okOrErr.unwrapErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+    IncreaseExpectedStackId();
+
+    ASSERT_EQ(err.StackId(), ExpectedStackId());
+    ASSERT_EQ(err.FrameId(), 1u);
+    ASSERT_EQ(err.NSResult(), NS_ERROR_FAILURE);
+#else
+    ASSERT_EQ(err, NS_ERROR_FAILURE);
+#endif
+  }
+}
+
+TEST_F(DOM_Quota_ResultExtensions_ToResult, FromNSResult_Failure_Macro) {
+  auto okOrErr = QM_TO_RESULT(NS_ERROR_FAILURE);
+  static_assert(std::is_same_v<decltype(okOrErr), OkOrErr>);
+  ASSERT_TRUE(okOrErr.isErr());
+  auto err = okOrErr.unwrapErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(err.StackId(), ExpectedStackId());
+  ASSERT_EQ(err.FrameId(), 1u);
+  ASSERT_EQ(err.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(err, NS_ERROR_FAILURE);
+#endif
+}
+
+TEST_F(DOM_Quota_ResultExtensions_GenericErrorResult, ErrorPropagation) {
+  OkOrErr okOrErr1 = ToResult<QMResult>(ToQMResult(NS_ERROR_FAILURE));
+  const auto& err1 = okOrErr1.inspectErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  IncreaseExpectedStackId();
+
+  ASSERT_EQ(err1.StackId(), ExpectedStackId());
+  ASSERT_EQ(err1.FrameId(), 1u);
+  ASSERT_EQ(err1.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(err1, NS_ERROR_FAILURE);
+#endif
+
+  OkOrErr okOrErr2 = okOrErr1.propagateErr();
+  const auto& err2 = okOrErr2.inspectErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  ASSERT_EQ(err2.StackId(), ExpectedStackId());
+  ASSERT_EQ(err2.FrameId(), 2u);
+  ASSERT_EQ(err2.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(err2, NS_ERROR_FAILURE);
+#endif
+
+  OkOrErr okOrErr3 = okOrErr2.propagateErr();
+  const auto& err3 = okOrErr3.inspectErr();
+
+#ifdef QM_ERROR_STACKS_ENABLED
+  ASSERT_EQ(err3.StackId(), ExpectedStackId());
+  ASSERT_EQ(err3.FrameId(), 3u);
+  ASSERT_EQ(err3.NSResult(), NS_ERROR_FAILURE);
+#else
+  ASSERT_EQ(err3, NS_ERROR_FAILURE);
+#endif
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_NoInput)
+{
+  auto res = ToResultGet<int32_t>([](nsresult* aRv) -> int32_t {
+    *aRv = NS_OK;
+    return 42;
+  });
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_NoInput_Err)
+{
+  auto res = ToResultGet<int32_t>([](nsresult* aRv) -> int32_t {
+    *aRv = NS_ERROR_FAILURE;
+    return -1;
+  });
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_WithInput)
+{
+  auto res = ToResultGet<int32_t>(
+      [](int32_t aValue, nsresult* aRv) -> int32_t {
+        *aRv = NS_OK;
+        return aValue * 2;
+      },
+      42);
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 84);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_WithInput_Err)
+{
+  auto res = ToResultGet<int32_t>(
+      [](int32_t aValue, nsresult* aRv) -> int32_t {
+        *aRv = NS_ERROR_FAILURE;
+        return -1;
+      },
+      42);
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_NoInput_Macro_Typed)
+{
+  auto res = MOZ_TO_RESULT_GET_TYPED(int32_t, [](nsresult* aRv) -> int32_t {
+    *aRv = NS_OK;
+    return 42;
+  });
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 42);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_NoInput_Macro_Typed_Parens)
+{
+  auto res =
+      MOZ_TO_RESULT_GET_TYPED((std::pair<int32_t, int32_t>),
+                              [](nsresult* aRv) -> std::pair<int32_t, int32_t> {
+                                *aRv = NS_OK;
+                                return std::pair{42, 42};
+                              });
+
+  static_assert(std::is_same_v<decltype(res),
+                               Result<std::pair<int32_t, int32_t>, nsresult>>);
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), (std::pair{42, 42}));
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_NoInput_Err_Macro_Typed)
+{
+  auto res = MOZ_TO_RESULT_GET_TYPED(int32_t, [](nsresult* aRv) -> int32_t {
+    *aRv = NS_ERROR_FAILURE;
+    return -1;
+  });
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_WithInput_Macro_Typed)
+{
+  auto res = MOZ_TO_RESULT_GET_TYPED(
+      int32_t,
+      [](int32_t aValue, nsresult* aRv) -> int32_t {
+        *aRv = NS_OK;
+        return aValue * 2;
+      },
+      42);
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isOk());
+  EXPECT_EQ(res.unwrap(), 84);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultGet, Lambda_WithInput_Err_Macro_Typed)
+{
+  auto res = MOZ_TO_RESULT_GET_TYPED(
+      int32_t,
+      [](int32_t aValue, nsresult* aRv) -> int32_t {
+        *aRv = NS_ERROR_FAILURE;
+        return -1;
+      },
+      42);
+
+  static_assert(std::is_same_v<decltype(res), Result<int32_t, nsresult>>);
+
+  EXPECT_TRUE(res.isErr());
+  EXPECT_EQ(res.unwrapErr(), NS_ERROR_FAILURE);
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultInvoke, Lambda_NoInput_Complex)
+{
+  TestClass foo;
+
+  // success
+  {
+    auto valOrErr =
+        ToResultInvoke<std::pair<int, int>>([&foo](std::pair<int, int>* out) {
+          return foo.NonOverloadedNoInputComplex(out);
+        });
+    static_assert(std::is_same_v<decltype(valOrErr),
+                                 Result<std::pair<int, int>, nsresult>>);
+    ASSERT_TRUE(valOrErr.isOk());
+    ASSERT_EQ((std::pair{TestClass::kTestValue, TestClass::kTestValue}),
+              valOrErr.unwrap());
+  }
+
+  // failure
+  {
+    auto valOrErr =
+        ToResultInvoke<std::pair<int, int>>([&foo](std::pair<int, int>* out) {
+          return foo.NonOverloadedNoInputFailsComplex(out);
+        });
+    static_assert(std::is_same_v<decltype(valOrErr),
+                                 Result<std::pair<int, int>, nsresult>>);
+    ASSERT_TRUE(valOrErr.isErr());
+    ASSERT_EQ(NS_ERROR_FAILURE, valOrErr.unwrapErr());
+  }
+}
+
+TEST(DOM_Quota_ResultExtensions_ToResultInvoke,
+     Lambda_NoInput_Complex_Macro_Typed)
+{
+  TestClass foo;
+
+  // success
+  {
+    auto valOrErr = MOZ_TO_RESULT_INVOKE_TYPED(
+        (std::pair<int, int>), [&foo](std::pair<int, int>* out) {
+          return foo.NonOverloadedNoInputComplex(out);
+        });
+    static_assert(std::is_same_v<decltype(valOrErr),
+                                 Result<std::pair<int, int>, nsresult>>);
+    ASSERT_TRUE(valOrErr.isOk());
+    ASSERT_EQ((std::pair{TestClass::kTestValue, TestClass::kTestValue}),
+              valOrErr.unwrap());
+  }
+
+  // failure
+  {
+    auto valOrErr = MOZ_TO_RESULT_INVOKE_TYPED(
+        (std::pair<int, int>), [&foo](std::pair<int, int>* out) {
+          return foo.NonOverloadedNoInputFailsComplex(out);
+        });
+    static_assert(std::is_same_v<decltype(valOrErr),
+                                 Result<std::pair<int, int>, nsresult>>);
+    ASSERT_TRUE(valOrErr.isErr());
+    ASSERT_EQ(NS_ERROR_FAILURE, valOrErr.unwrapErr());
+  }
+}
diff --git a/dom/quota/test/gtest/TestScopedLogExtraInfo.cpp b/dom/quota/test/gtest/TestScopedLogExtraInfo.cpp
new file mode 100644
index 0000000000..00a3393844
--- /dev/null
+++ b/dom/quota/test/gtest/TestScopedLogExtraInfo.cpp
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/ScopedLogExtraInfo.h"
+
+#include "gtest/gtest.h"
+
+using namespace mozilla::dom::quota;
+
+TEST(DOM_Quota_ScopedLogExtraInfo, AddAndRemove)
+{
+  static constexpr auto text = "foo"_ns;
+
+  {
+    const auto extraInfo =
+        ScopedLogExtraInfo{ScopedLogExtraInfo::kTagQuery, text};
+
+#ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
+    const auto& extraInfoMap = ScopedLogExtraInfo::GetExtraInfoMap();
+
+    EXPECT_EQ(text, *extraInfoMap.at(ScopedLogExtraInfo::kTagQuery));
+#endif
+  }
+
+#ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
+  const auto& extraInfoMap = ScopedLogExtraInfo::GetExtraInfoMap();
+
+  EXPECT_EQ(0u, extraInfoMap.count(ScopedLogExtraInfo::kTagQuery));
+#endif
+}
+
+TEST(DOM_Quota_ScopedLogExtraInfo, Nested)
+{
+  static constexpr auto text = "foo"_ns;
+  static constexpr auto nestedText = "bar"_ns;
+
+  {
+    const auto extraInfo =
+        ScopedLogExtraInfo{ScopedLogExtraInfo::kTagQuery, text};
+
+    {
+      const auto extraInfo =
+          ScopedLogExtraInfo{ScopedLogExtraInfo::kTagQuery, nestedText};
+
+#ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
+      const auto& extraInfoMap = ScopedLogExtraInfo::GetExtraInfoMap();
+      EXPECT_EQ(nestedText, *extraInfoMap.at(ScopedLogExtraInfo::kTagQuery));
+#endif
+    }
+
+#ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
+    const auto& extraInfoMap = ScopedLogExtraInfo::GetExtraInfoMap();
+    EXPECT_EQ(text, *extraInfoMap.at(ScopedLogExtraInfo::kTagQuery));
+#endif
+  }
+
+#ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
+  const auto& extraInfoMap = ScopedLogExtraInfo::GetExtraInfoMap();
+
+  EXPECT_EQ(0u, extraInfoMap.count(ScopedLogExtraInfo::kTagQuery));
+#endif
+}
diff --git a/dom/quota/test/gtest/TestStorageConnection.cpp b/dom/quota/test/gtest/TestStorageConnection.cpp
new file mode 100644
index 0000000000..9ff19ec44f
--- /dev/null
+++ b/dom/quota/test/gtest/TestStorageConnection.cpp
@@ -0,0 +1,283 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "QuotaManagerDependencyFixture.h"
+#include "mozIStorageConnection.h"
+#include "mozIStorageService.h"
+#include "mozStorageCID.h"
+#include "mozilla/dom/quota/IPCStreamCipherStrategy.h"
+#include "mozilla/dom/quota/QuotaCommon.h"
+#include "mozilla/dom/quota/QuotaManager.h"
+#include "mozilla/dom/quota/QuotaObject.h"
+#include "mozilla/dom/quota/ResultExtensions.h"
+#include "nsIFile.h"
+#include "nsIFileProtocolHandler.h"
+#include "nsIFileURL.h"
+#include "nsIURIMutator.h"
+#include "nss.h"
+
+namespace mozilla {
+
+struct NSSInitContextDeleter {
+  void operator()(NSSInitContext* p) { NSS_ShutdownContext(p); }
+};
+
+namespace dom::quota::test {
+
+namespace {
+
+void InitializeClientDirectory(const ClientMetadata& aClientMetadata) {
+  QuotaManager* quotaManager = QuotaManager::Get();
+
+  QM_TRY(MOZ_TO_RESULT(
+             quotaManager->EnsureTemporaryStorageIsInitializedInternal()),
+         QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(const auto& directory,
+                 quotaManager
+                     ->EnsureTemporaryOriginIsInitialized(
+                         aClientMetadata.mPersistenceType, aClientMetadata)
+                     .map([](const auto& aPair) { return aPair.first; }),
+                 QM_TEST_FAIL);
+
+  QM_TRY(MOZ_TO_RESULT(directory->Append(
+             Client::TypeToString(aClientMetadata.mClientType))),
+         QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(const bool& exists,
+                 MOZ_TO_RESULT_INVOKE_MEMBER(directory, Exists), QM_TEST_FAIL);
+
+  if (!exists) {
+    QM_TRY(MOZ_TO_RESULT(directory->Create(nsIFile::DIRECTORY_TYPE, 0755)),
+           QM_TEST_FAIL);
+  }
+}
+
+void CreateStorageConnection(
+    const ClientMetadata& aClientMetadata,
+    const Maybe<int64_t>& aMaybeDirectoryLockId,
+    const Maybe<IPCStreamCipherStrategy::KeyType>& aMaybeKey,
+    nsCOMPtr<mozIStorageConnection>& aConnection) {
+  QuotaManager* quotaManager = QuotaManager::Get();
+
+  QM_TRY_UNWRAP(auto databaseFile,
+                quotaManager->GetOriginDirectory(aClientMetadata),
+                QM_TEST_FAIL);
+
+  QM_TRY(MOZ_TO_RESULT(databaseFile->Append(
+             Client::TypeToString(aClientMetadata.mClientType))),
+         QM_TEST_FAIL);
+
+  QM_TRY(MOZ_TO_RESULT(databaseFile->Append(u"testdatabase.sqlite"_ns)),
+         QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(
+      const auto& protocolHandler,
+      MOZ_TO_RESULT_GET_TYPED(nsCOMPtr<nsIProtocolHandler>,
+                              MOZ_SELECT_OVERLOAD(do_GetService),
+                              NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "file"),
+      QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(const auto& fileHandler,
+                 MOZ_TO_RESULT_GET_TYPED(nsCOMPtr<nsIFileProtocolHandler>,
+                                         MOZ_SELECT_OVERLOAD(do_QueryInterface),
+                                         protocolHandler),
+                 QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(
+      const auto& mutator,
+      MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(nsCOMPtr<nsIURIMutator>, fileHandler,
+                                        NewFileURIMutator, databaseFile),
+      QM_TEST_FAIL);
+
+  const auto directoryLockIdClause = [&aMaybeDirectoryLockId] {
+    nsAutoCString directoryLockIdClause;
+    if (aMaybeDirectoryLockId) {
+      directoryLockIdClause =
+          "&directoryLockId="_ns + IntToCString(*aMaybeDirectoryLockId);
+    }
+    return directoryLockIdClause;
+  }();
+
+  const auto keyClause = [&aMaybeKey] {
+    nsAutoCString keyClause;
+    if (aMaybeKey) {
+      keyClause.AssignLiteral("&key=");
+      for (uint8_t byte : IPCStreamCipherStrategy::SerializeKey(*aMaybeKey)) {
+        keyClause.AppendPrintf("%02x", byte);
+      }
+    }
+    return keyClause;
+  }();
+
+  QM_TRY_INSPECT(
+      const auto& fileURL,
+      ([&mutator, &directoryLockIdClause,
+        &keyClause]() -> Result<nsCOMPtr<nsIFileURL>, nsresult> {
+        nsCOMPtr<nsIFileURL> result;
+        QM_TRY(MOZ_TO_RESULT(NS_MutateURI(mutator)
+                                 .SetQuery("cache=private"_ns +
+                                           directoryLockIdClause + keyClause)
+                                 .Finalize(result)));
+        return result;
+      }()),
+      QM_TEST_FAIL);
+
+  QM_TRY_INSPECT(const auto& storageService,
+                 MOZ_TO_RESULT_GET_TYPED(nsCOMPtr<mozIStorageService>,
+                                         MOZ_SELECT_OVERLOAD(do_GetService),
+                                         MOZ_STORAGE_SERVICE_CONTRACTID),
+                 QM_TEST_FAIL);
+
+  QM_TRY_UNWRAP(auto connection,
+                MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                    nsCOMPtr<mozIStorageConnection>, storageService,
+                    OpenDatabaseWithFileURL, fileURL, EmptyCString(),
+                    mozIStorageService::CONNECTION_DEFAULT),
+                QM_TEST_FAIL);
+
+  QM_TRY(MOZ_TO_RESULT(
+             connection->ExecuteSimpleSQL("PRAGMA journal_mode = wal;"_ns)),
+         QM_TEST_FAIL);
+
+  // The connection needs to be re-created, otherwise GetQuotaObjects is not
+  // able to get the quota object for the journal file.
+
+  QM_TRY(MOZ_TO_RESULT(connection->Close()), QM_TEST_FAIL);
+
+  QM_TRY_UNWRAP(connection,
+                MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(
+                    nsCOMPtr<mozIStorageConnection>, storageService,
+                    OpenDatabaseWithFileURL, fileURL, EmptyCString(),
+                    mozIStorageService::CONNECTION_DEFAULT),
+                QM_TEST_FAIL);
+
+  aConnection = std::move(connection);
+}
+
+}  // namespace
+
+class TestStorageConnection : public QuotaManagerDependencyFixture {
+ public:
+  static void SetUpTestCase() {
+    // Do this only once, do not tear it down per test case.
+    if (!sNssContext) {
+      sNssContext.reset(
+          NSS_InitContext("", "", "", "", nullptr,
+                          NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+                              NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+                              NSS_INIT_OPTIMIZESPACE | NSS_INIT_NOROOTINIT));
+    }
+
+    ASSERT_NO_FATAL_FAILURE(InitializeFixture());
+  }
+
+  static void TearDownTestCase() {
+    ASSERT_NO_FATAL_FAILURE(ShutdownFixture());
+
+    sNssContext = nullptr;
+  }
+
+  void TearDown() override {
+    ASSERT_NO_FATAL_FAILURE(ClearStoragesForOrigin(GetTestOriginMetadata()));
+  }
+
+ private:
+  struct NSSInitContextDeleter {
+    void operator()(NSSInitContext* p) { NSS_ShutdownContext(p); }
+  };
+  inline static std::unique_ptr<NSSInitContext, NSSInitContextDeleter>
+      sNssContext;
+};
+
+TEST_F(TestStorageConnection, BaseVFS) {
+  // XXX This call can't be wrapped with ASSERT_NO_FATAL_FAILURE because
+  // base-toolchains builds fail with: error: duplicate label
+  // 'gtest_label_testnofatal_214'
+  PerformClientDirectoryTest(GetTestClientMetadata(), [](int64_t) {
+    ASSERT_NO_FATAL_FAILURE(InitializeClientDirectory(GetTestClientMetadata()));
+
+    nsCOMPtr<mozIStorageConnection> connection;
+    ASSERT_NO_FATAL_FAILURE(CreateStorageConnection(
+        GetTestClientMetadata(), Nothing(), Nothing(), connection));
+
+    RefPtr<QuotaObject> quotaObject;
+    RefPtr<QuotaObject> journalQuotaObject;
+
+    nsresult rv = connection->GetQuotaObjects(
+        getter_AddRefs(quotaObject), getter_AddRefs(journalQuotaObject));
+    ASSERT_EQ(rv, NS_ERROR_FAILURE);
+
+    ASSERT_FALSE(quotaObject);
+    ASSERT_FALSE(journalQuotaObject);
+
+    QM_TRY(MOZ_TO_RESULT(connection->Close()), QM_TEST_FAIL);
+  });
+}
+
+TEST_F(TestStorageConnection, QuotaVFS) {
+  // XXX This call can't be wrapped with ASSERT_NO_FATAL_FAILURE because
+  // base-toolchains builds fail with: error: duplicate label
+  // 'gtest_label_testnofatal_214'
+  PerformClientDirectoryTest(
+      GetTestClientMetadata(), [](int64_t aDirectoryLockId) {
+        ASSERT_NO_FATAL_FAILURE(
+            InitializeClientDirectory(GetTestClientMetadata()));
+
+        nsCOMPtr<mozIStorageConnection> connection;
+        ASSERT_NO_FATAL_FAILURE(CreateStorageConnection(GetTestClientMetadata(),
+                                                        Some(aDirectoryLockId),
+                                                        Nothing(), connection));
+
+        RefPtr<QuotaObject> quotaObject;
+        RefPtr<QuotaObject> journalQuotaObject;
+
+        QM_TRY(MOZ_TO_RESULT(connection->GetQuotaObjects(
+                   getter_AddRefs(quotaObject),
+                   getter_AddRefs(journalQuotaObject))),
+               QM_TEST_FAIL);
+
+        ASSERT_TRUE(quotaObject);
+        ASSERT_TRUE(journalQuotaObject);
+
+        QM_TRY(MOZ_TO_RESULT(connection->Close()), QM_TEST_FAIL);
+      });
+}
+
+TEST_F(TestStorageConnection, ObfuscatingVFS) {
+  // XXX This call can't be wrapped with ASSERT_NO_FATAL_FAILURE because
+  // base-toolchains builds fail with: error: duplicate label
+  // 'gtest_label_testnofatal_214'
+  PerformClientDirectoryTest(
+      GetTestClientMetadata(), [](int64_t aDirectoryLockId) {
+        ASSERT_NO_FATAL_FAILURE(
+            InitializeClientDirectory(GetTestClientMetadata()));
+
+        QM_TRY_INSPECT(const auto& key, IPCStreamCipherStrategy::GenerateKey(),
+                       QM_TEST_FAIL);
+
+        nsCOMPtr<mozIStorageConnection> connection;
+        ASSERT_NO_FATAL_FAILURE(CreateStorageConnection(GetTestClientMetadata(),
+                                                        Some(aDirectoryLockId),
+                                                        Some(key), connection));
+
+        RefPtr<QuotaObject> quotaObject;
+        RefPtr<QuotaObject> journalQuotaObject;
+
+        QM_TRY(MOZ_TO_RESULT(connection->GetQuotaObjects(
+                   getter_AddRefs(quotaObject),
+                   getter_AddRefs(journalQuotaObject))),
+               QM_TEST_FAIL);
+
+        ASSERT_TRUE(quotaObject);
+        ASSERT_TRUE(journalQuotaObject);
+
+        QM_TRY(MOZ_TO_RESULT(connection->Close()), QM_TEST_FAIL);
+      });
+}
+
+}  // namespace dom::quota::test
+}  // namespace mozilla
diff --git a/dom/quota/test/gtest/TestStorageOriginAttributes.cpp b/dom/quota/test/gtest/TestStorageOriginAttributes.cpp
new file mode 100644
index 0000000000..4529e1d53b
--- /dev/null
+++ b/dom/quota/test/gtest/TestStorageOriginAttributes.cpp
@@ -0,0 +1,165 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/StorageOriginAttributes.h"
+
+namespace mozilla::dom::quota::test {
+
+TEST(DOM_Quota_StorageOriginAttributes, PopulateFromOrigin_NoOriginAttributes)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin("https://www.example.com"_ns,
+                                                  originNoSuffix);
+
+    ASSERT_TRUE(ok);
+    ASSERT_FALSE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes,
+     PopulateFromOrigin_InvalidOriginAttribute)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^foo=bar"_ns, originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_FALSE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes,
+     PopulateFromOrigin_InIsolatedMozBrowser_Valid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=1"_ns, originNoSuffix);
+
+    ASSERT_TRUE(ok);
+    ASSERT_TRUE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes,
+     PopulateFromOrigin_InIsolatedMozBrowser_Invalid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=0"_ns, originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_FALSE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=true"_ns, originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_FALSE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=false"_ns, originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_FALSE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes, PopulateFromOrigin_UserContextId_Valid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^userContextId=1"_ns, originNoSuffix);
+
+    ASSERT_TRUE(ok);
+    ASSERT_EQ(originAttributes.UserContextId(), 1u);
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^userContextId=42"_ns, originNoSuffix);
+
+    ASSERT_TRUE(ok);
+    ASSERT_EQ(originAttributes.UserContextId(), 42u);
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes,
+     PopulateFromOrigin_UserContextId_Invalid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^userContextId=foo"_ns, originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_EQ(originAttributes.UserContextId(), 0u);
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes, PopulateFromOrigin_Mixed_Valid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=1&userContextId=1"_ns,
+        originNoSuffix);
+
+    ASSERT_TRUE(ok);
+    ASSERT_TRUE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_EQ(originAttributes.UserContextId(), 1u);
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+TEST(DOM_Quota_StorageOriginAttributes, PopulateFromOrigin_Mixed_Invalid)
+{
+  {
+    StorageOriginAttributes originAttributes;
+    nsCString originNoSuffix;
+    bool ok = originAttributes.PopulateFromOrigin(
+        "https://www.example.com^inBrowser=1&userContextId=1&foo=bar"_ns,
+        originNoSuffix);
+
+    ASSERT_FALSE(ok);
+    ASSERT_TRUE(originAttributes.InIsolatedMozBrowser());
+    ASSERT_EQ(originAttributes.UserContextId(), 1u);
+    ASSERT_TRUE(originNoSuffix.Equals("https://www.example.com"_ns));
+  }
+}
+
+}  // namespace mozilla::dom::quota::test
diff --git a/dom/quota/test/gtest/TestStringifyUtils.cpp b/dom/quota/test/gtest/TestStringifyUtils.cpp
new file mode 100644
index 0000000000..5d50b31f14
--- /dev/null
+++ b/dom/quota/test/gtest/TestStringifyUtils.cpp
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/StringifyUtils.h"
+
+#include "gtest/gtest.h"
+
+namespace mozilla::dom::quota {
+
+class B;
+class A : public Stringifyable {
+ public:
+  A() : mB(nullptr) {}
+  virtual void DoStringify(nsACString& aData) override;
+  void setB(B* aB) { mB = aB; }
+
+ private:
+  B* mB;
+};
+
+class B : public Stringifyable {
+ public:
+  B() : mA(nullptr) {}
+  virtual void DoStringify(nsACString& aData) override;
+  void setA(A* aA) { mA = aA; }
+
+ private:
+  A* mA;
+};
+
+void A::DoStringify(nsACString& aData) {
+  aData.Append("Class A content."_ns);
+  mB->Stringify(aData);
+}
+
+void B::DoStringify(nsACString& aData) {
+  aData.Append("Class B content.");
+  mA->Stringify(aData);
+}
+
+TEST(DOM_Quota_StringifyUtils, Nested)
+{
+  A a1;
+  A a2;
+  B b;
+  a1.setB(&b);
+  b.setA(&a2);
+  a2.setB(&b);
+  nsCString msg;
+  a1.Stringify(msg);
+
+  EXPECT_EQ(
+      0, strcmp("{Class A content.{Class B content.{Class A content.(...)}}}",
+                msg.get()));
+}
+
+}  // namespace mozilla::dom::quota
diff --git a/dom/quota/test/gtest/TestTelemetry.cpp b/dom/quota/test/gtest/TestTelemetry.cpp
new file mode 100644
index 0000000000..7936a5a253
--- /dev/null
+++ b/dom/quota/test/gtest/TestTelemetry.cpp
@@ -0,0 +1,185 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/SimpleGlobalObject.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "nsITelemetry.h"
+#include "QuotaManagerDependencyFixture.h"
+
+namespace mozilla::dom::quota::test {
+
+namespace {
+
+namespace js_helpers {
+
+void CallFunction(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                  const char* aName, JS::MutableHandle<JS::Value> aResult) {
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+  JS::Rooted<JS::Value> result(aCx);
+  ASSERT_TRUE(JS_CallFunctionName(aCx, obj, aName,
+                                  JS::HandleValueArray::empty(), &result));
+
+  aResult.set(result);
+}
+
+void HasProperty(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                 const char* aName, bool* aResult) {
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+  bool result;
+  ASSERT_TRUE(JS_HasProperty(aCx, obj, aName, &result));
+
+  *aResult = result;
+}
+
+void GetProperty(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                 const char* aName, JS::MutableHandle<JS::Value> aResult) {
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+  JS::Rooted<JS::Value> result(aCx);
+  ASSERT_TRUE(JS_GetProperty(aCx, obj, aName, &result));
+
+  aResult.set(result);
+}
+
+void Enumerate(JSContext* aCx, JS::Handle<JS::Value> aValue,
+               JS::MutableHandle<JS::IdVector> aResult) {
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+  ASSERT_TRUE(JS_Enumerate(aCx, obj, aResult));
+}
+
+void GetElement(JSContext* aCx, JS::Handle<JS::Value> aValue, uint32_t aIndex,
+                JS::MutableHandle<JS::Value> aResult) {
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+  JS::Rooted<JS::Value> result(aCx);
+  ASSERT_TRUE(JS_GetElement(aCx, obj, aIndex, &result));
+
+  aResult.set(result);
+}
+
+void GetIndexValue(JSContext* aCx, JS::Handle<JS::Value> aValues,
+                   JS::PropertyKey aIndexId, uint32_t* aResult) {
+  nsAutoJSString indexId;
+  ASSERT_TRUE(indexId.init(aCx, aIndexId));
+
+  nsresult rv;
+  const auto index = indexId.ToInteger64(&rv);
+  ASSERT_NS_SUCCEEDED(rv);
+
+  JS::Rooted<JS::Value> element(aCx);
+  GetElement(aCx, aValues, index, &element);
+
+  uint32_t value = 0;
+  ASSERT_TRUE(JS::ToUint32(aCx, element, &value));
+
+  *aResult = value;
+}
+
+}  // namespace js_helpers
+
+}  // namespace
+
+TEST(DOM_Quota_Telemetry, ShutdownTime)
+{
+  nsCOMPtr<nsITelemetry> telemetry =
+      do_GetService("@mozilla.org/base/telemetry;1");
+
+  JSObject* simpleGlobal = dom::SimpleGlobalObject::Create(
+      dom::SimpleGlobalObject::GlobalType::BindingDetail);
+
+  JS::Rooted<JSObject*> global(dom::RootingCx(), simpleGlobal);
+
+  AutoJSAPI jsapi;
+  ASSERT_TRUE(jsapi.Init(global));
+
+  JSContext* cx = jsapi.cx();
+
+  JS::Rooted<JS::Value> histogram(cx);
+  ASSERT_NS_SUCCEEDED(telemetry->GetKeyedHistogramById("QM_SHUTDOWN_TIME_V0"_ns,
+                                                       cx, &histogram));
+
+  JS::Rooted<JS::Value> dummy(cx);
+  ASSERT_NO_FATAL_FAILURE(
+      js_helpers::CallFunction(cx, histogram, "clear", &dummy));
+
+  ASSERT_NO_FATAL_FAILURE(QuotaManagerDependencyFixture::InitializeFixture());
+  ASSERT_NO_FATAL_FAILURE(QuotaManagerDependencyFixture::ShutdownFixture());
+
+  JS::Rooted<JS::Value> snapshot(cx);
+  ASSERT_NO_FATAL_FAILURE(
+      js_helpers::CallFunction(cx, histogram, "snapshot", &snapshot));
+
+  {
+    bool hasKey = false;
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::HasProperty(cx, snapshot, "Normal", &hasKey));
+    ASSERT_TRUE(hasKey);
+
+    JS::Rooted<JS::Value> key(cx);
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::GetProperty(cx, snapshot, "Normal", &key));
+
+    JS::Rooted<JS::Value> values(cx);
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::GetProperty(cx, key, "values", &values));
+
+    JS::Rooted<JS::IdVector> indexIds(cx, JS::IdVector(cx));
+    ASSERT_NO_FATAL_FAILURE(js_helpers::Enumerate(cx, values, &indexIds));
+    ASSERT_TRUE(indexIds.length() == 2u || indexIds.length() == 3u);
+
+    if (indexIds.length() == 2) {
+      uint32_t value = 0u;
+
+      ASSERT_NO_FATAL_FAILURE(
+          js_helpers::GetIndexValue(cx, values, indexIds[0], &value));
+      ASSERT_EQ(value, 1u);
+
+      ASSERT_NO_FATAL_FAILURE(
+          js_helpers::GetIndexValue(cx, values, indexIds[1], &value));
+      ASSERT_EQ(value, 0u);
+    } else {
+      uint32_t value = 1u;
+
+      ASSERT_NO_FATAL_FAILURE(
+          js_helpers::GetIndexValue(cx, values, indexIds[0], &value));
+      ASSERT_EQ(value, 0u);
+
+      ASSERT_NO_FATAL_FAILURE(
+          js_helpers::GetIndexValue(cx, values, indexIds[1], &value));
+      ASSERT_EQ(value, 1u);
+
+      ASSERT_NO_FATAL_FAILURE(
+          js_helpers::GetIndexValue(cx, values, indexIds[2], &value));
+      ASSERT_EQ(value, 0u);
+    }
+  }
+
+  {
+    bool hasKey = true;
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::HasProperty(cx, snapshot, "WasSuspended", &hasKey));
+    ASSERT_FALSE(hasKey);
+  }
+
+  {
+    bool hasKey = true;
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::HasProperty(cx, snapshot, "TimeStampErr1", &hasKey));
+    ASSERT_FALSE(hasKey);
+  }
+
+  {
+    bool hasKey = true;
+    ASSERT_NO_FATAL_FAILURE(
+        js_helpers::HasProperty(cx, snapshot, "TimeStampErr2", &hasKey));
+    ASSERT_FALSE(hasKey);
+  }
+}
+
+}  // namespace mozilla::dom::quota::test
diff --git a/dom/quota/test/gtest/TestUsageInfo.cpp b/dom/quota/test/gtest/TestUsageInfo.cpp
new file mode 100644
index 0000000000..124783b715
--- /dev/null
+++ b/dom/quota/test/gtest/TestUsageInfo.cpp
@@ -0,0 +1,136 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/UsageInfo.h"
+
+#include "gtest/gtest.h"
+
+#include <cstdint>
+#include <memory>
+#include <ostream>
+#include <utility>
+#include "mozilla/Maybe.h"
+#include "mozilla/dom/quota/QuotaCommon.h"
+#include "mozilla/fallible.h"
+
+using namespace mozilla;
+using namespace mozilla::dom::quota;
+
+namespace {
+constexpr uint64_t kTestValue = 42;
+constexpr uint64_t kTestValueZero = 0;
+}  // namespace
+
+TEST(DOM_Quota_UsageInfo, DefaultConstructed)
+{
+  const UsageInfo usageInfo;
+  EXPECT_EQ(Nothing(), usageInfo.FileUsage());
+  EXPECT_EQ(Nothing(), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, FileOnly)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(kTestValue), usageInfo.FileUsage());
+  EXPECT_EQ(Some(kTestValue), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, DatabaseOnly)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += DatabaseUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Nothing(), usageInfo.FileUsage());
+  EXPECT_EQ(Some(kTestValue), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, FileOnly_Zero)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(kTestValueZero));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(kTestValueZero), usageInfo.FileUsage());
+  EXPECT_EQ(Some(kTestValueZero), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, DatabaseOnly_Zero)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += DatabaseUsageType(Some(kTestValueZero));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Nothing(), usageInfo.FileUsage());
+  EXPECT_EQ(Some(kTestValueZero), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, Both)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(kTestValue));
+    usageInfo += DatabaseUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(kTestValue), usageInfo.FileUsage());
+  EXPECT_EQ(Some(2 * kTestValue), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, Both_Zero)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(kTestValueZero));
+    usageInfo += DatabaseUsageType(Some(kTestValueZero));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(kTestValueZero), usageInfo.FileUsage());
+  EXPECT_EQ(Some(kTestValueZero), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, CapCombined)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(UINT64_MAX));
+    usageInfo += DatabaseUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(UINT64_MAX), usageInfo.FileUsage());
+  EXPECT_EQ(Some(UINT64_MAX), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, CapFileUsage)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += FileUsageType(Some(UINT64_MAX));
+    usageInfo += FileUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Some(UINT64_MAX), usageInfo.FileUsage());
+  EXPECT_EQ(Some(UINT64_MAX), usageInfo.TotalUsage());
+}
+
+TEST(DOM_Quota_UsageInfo, CapDatabaseUsage)
+{
+  const UsageInfo usageInfo = [] {
+    UsageInfo usageInfo;
+    usageInfo += DatabaseUsageType(Some(UINT64_MAX));
+    usageInfo += DatabaseUsageType(Some(kTestValue));
+    return usageInfo;
+  }();
+  EXPECT_EQ(Nothing(), usageInfo.FileUsage());
+  EXPECT_EQ(Some(UINT64_MAX), usageInfo.TotalUsage());
+}
diff --git a/dom/quota/test/gtest/moz.build b/dom/quota/test/gtest/moz.build
new file mode 100644
index 0000000000..d983e3457e
--- /dev/null
+++ b/dom/quota/test/gtest/moz.build
@@ -0,0 +1,50 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS.mozilla.dom.quota += [
+    "QuotaTestChild.h",
+    "QuotaTestParent.h",
+]
+
+EXPORTS.mozilla.dom.quota.test += [
+    "QuotaManagerDependencyFixture.h",
+]
+
+UNIFIED_SOURCES = [
+    "Common.cpp",
+    "QuotaManagerDependencyFixture.cpp",
+    "TestCheckedUnsafePtr.cpp",
+    "TestClientUsageArray.cpp",
+    "TestEncryptedStream.cpp",
+    "TestFileOutputStream.cpp",
+    "TestFlatten.cpp",
+    "TestForwardDecls.cpp",
+    "TestOriginParser.cpp",
+    "TestOriginScope.cpp",
+    "TestPersistenceType.cpp",
+    "TestQMResult.cpp",
+    "TestQuotaCommon.cpp",
+    "TestQuotaManager.cpp",
+    "TestResultExtensions.cpp",
+    "TestScopedLogExtraInfo.cpp",
+    "TestStorageConnection.cpp",
+    "TestStorageOriginAttributes.cpp",
+    "TestStringifyUtils.cpp",
+    "TestTelemetry.cpp",
+    "TestUsageInfo.cpp",
+]
+
+IPDL_SOURCES += [
+    "PQuotaTest.ipdl",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul-gtest"
+
+LOCAL_INCLUDES += [
+    "/dom/quota",
+]
diff --git a/dom/quota/test/marionette/dummy.py b/dom/quota/test/marionette/dummy.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/dom/quota/test/marionette/dummy.py
diff --git a/dom/quota/test/marionette/manifest.toml b/dom/quota/test/marionette/manifest.toml
new file mode 100644
index 0000000000..de02cdd541
--- /dev/null
+++ b/dom/quota/test/marionette/manifest.toml
@@ -0,0 +1,5 @@
+[DEFAULT]
+support-files = ["quota_test_case.py"]
+
+["dummy.py"]
+skip-if = ["true"]
diff --git a/dom/quota/test/marionette/quota_test_case.py b/dom/quota/test/marionette/quota_test_case.py
new file mode 100644
index 0000000000..c31edcaaf7
--- /dev/null
+++ b/dom/quota/test/marionette/quota_test_case.py
@@ -0,0 +1,113 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+from contextlib import contextmanager
+
+from marionette_driver import Wait
+from marionette_harness import MarionetteTestCase
+
+
+class QuotaTestCase(MarionetteTestCase):
+    def ensureInvariantHolds(self, op):
+        maxWaitTime = 60
+        Wait(self.marionette, timeout=maxWaitTime).until(
+            op,
+            message=f"operation did not yield success even after waiting {maxWaitTime}s time",
+        )
+
+    def findDirObj(self, path, pattern, isFile):
+        for obj in os.scandir(path):
+            if obj.path.endswith(pattern) and (obj.is_file() == isFile):
+                return obj.path
+        return None
+
+    def getFullOriginMetadata(self, persistenceType, origin):
+        with self.marionette.using_context("chrome"):
+            res = self.marionette.execute_async_script(
+                """
+                    const [persistenceType, origin, resolve] = arguments;
+
+                    const principal = Services.scriptSecurityManager.
+                        createContentPrincipalFromOrigin(origin);
+
+                    const request = Services.qms.getFullOriginMetadata(
+                        persistenceType, principal);
+
+                    request.callback = function() {
+                      if (request.resultCode != Cr.NS_OK) {
+                        resolve(null);
+                      } else {
+                        resolve(request.result);
+                      }
+                    }
+                """,
+                script_args=(persistenceType, origin),
+                new_sandbox=False,
+            )
+
+            assert res is not None
+            return res
+
+    def getStoragePath(self, profilePath, origin, persistenceType, client):
+        fullOriginMetadata = self.getFullOriginMetadata(persistenceType, origin)
+
+        storageOrigin = fullOriginMetadata["storageOrigin"]
+        sanitizedStorageOrigin = storageOrigin.replace(":", "+").replace("/", "+")
+
+        return os.path.join(
+            profilePath, "storage", persistenceType, sanitizedStorageOrigin, client
+        )
+
+    def resetStoragesForPrincipal(self, origin, persistenceType, client):
+        # This method is used to force sqlite to write journal file contents to
+        # main sqlite database file
+
+        script = """
+            const [resolve] = arguments
+
+            let origin = '%s';
+            let persistenceType = '%s';
+            let client = '%s';
+            let principal = Services.scriptSecurityManager.
+                                createContentPrincipalFromOrigin(origin);
+
+            let req = Services.qms.resetStoragesForPrincipal(principal, persistenceType, client);
+            req.callback = () => {
+                if (req.resultCode == Cr.NS_OK) {
+                    resolve(true);
+                } else {
+                    resolve(false);
+                }
+            }
+            """ % (
+            origin,
+            persistenceType,
+            client,
+        )
+
+        with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
+            return self.marionette.execute_async_script(script)
+
+    @contextmanager
+    def using_new_window(self, path, private=False):
+        """
+        This helper method is created to ensure that a temporary
+        window required inside the test scope is lifetime'd properly
+        """
+
+        oldWindow = self.marionette.current_window_handle
+        try:
+            newWindow = self.marionette.open(type="window", private=private)
+            self.marionette.switch_to_window(newWindow["handle"])
+            self.marionette.navigate(self.marionette.absolute_url(path))
+            origin = self.marionette.absolute_url("")[:-1]
+            if private:
+                origin += "^privateBrowsingId=1"
+
+            yield (origin, "private" if private else "default")
+
+        finally:
+            self.marionette.close()
+            self.marionette.switch_to_window(oldWindow)
diff --git a/dom/quota/test/mochitest/helpers.js b/dom/quota/test/mochitest/helpers.js
new file mode 100644
index 0000000000..a6f4ad56f7
--- /dev/null
+++ b/dom/quota/test/mochitest/helpers.js
@@ -0,0 +1,312 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../";
+
+var testGenerator;
+var testHarnessGenerator;
+var workerScriptPaths = [];
+
+loadScript("dom/quota/test/common/mochitest.js");
+
+function loadScript(path) {
+  const url = new URL(depth + path, window.location.href);
+  SpecialPowers.Services.scriptloader.loadSubScript(url.href, this);
+}
+
+function loadWorkerScript(path) {
+  const url = new URL(depth + path, window.location.href);
+  workerScriptPaths.push(url.href);
+}
+
+function* testHarnessSteps() {
+  function nextTestHarnessStep(val) {
+    testHarnessGenerator.next(val);
+  }
+
+  info("Enabling storage testing");
+
+  enableStorageTesting().then(nextTestHarnessStep);
+  yield undefined;
+
+  info("Pushing preferences");
+
+  SpecialPowers.pushPrefEnv(
+    {
+      set: [["dom.storageManager.prompt.testing", true]],
+    },
+    nextTestHarnessStep
+  );
+  yield undefined;
+
+  info("Clearing old databases");
+
+  clearAllDatabases(nextTestHarnessStep);
+  yield undefined;
+
+  info("Running test in given scopes");
+
+  if (workerScriptPaths.length) {
+    info("Running test in a worker");
+
+    let workerScriptBlob = new Blob(["(" + workerScript.toString() + ")();"], {
+      type: "text/javascript",
+    });
+    let workerScriptURL = URL.createObjectURL(workerScriptBlob);
+
+    let worker = new Worker(workerScriptURL);
+
+    worker.onerror = function (event) {
+      ok(false, "Worker had an error: " + event.message);
+      worker.terminate();
+      nextTestHarnessStep();
+    };
+
+    worker.onmessage = function (event) {
+      let message = event.data;
+      switch (message.op) {
+        case "ok":
+          ok(message.condition, message.name + " - " + message.diag);
+          break;
+
+        case "todo":
+          todo(message.condition, message.name, message.diag);
+          break;
+
+        case "info":
+          info(message.msg);
+          break;
+
+        case "ready":
+          worker.postMessage({ op: "load", files: workerScriptPaths });
+          break;
+
+        case "loaded":
+          worker.postMessage({ op: "start" });
+          break;
+
+        case "done":
+          ok(true, "Worker finished");
+          nextTestHarnessStep();
+          break;
+
+        case "clearAllDatabases":
+          clearAllDatabases(function () {
+            worker.postMessage({ op: "clearAllDatabasesDone" });
+          });
+          break;
+
+        default:
+          ok(
+            false,
+            "Received a bad message from worker: " + JSON.stringify(message)
+          );
+          nextTestHarnessStep();
+      }
+    };
+
+    URL.revokeObjectURL(workerScriptURL);
+
+    yield undefined;
+
+    worker.terminate();
+    worker = null;
+
+    clearAllDatabases(nextTestHarnessStep);
+    yield undefined;
+  }
+
+  info("Running test in main thread");
+
+  // Now run the test script in the main thread.
+  if (testSteps.constructor.name === "AsyncFunction") {
+    SimpleTest.registerCleanupFunction(async function () {
+      await requestFinished(clearAllDatabases());
+    });
+
+    add_task(testSteps);
+  } else {
+    testGenerator = testSteps();
+    testGenerator.next();
+
+    yield undefined;
+  }
+}
+
+if (!window.runTest) {
+  window.runTest = function () {
+    SimpleTest.waitForExplicitFinish();
+    testHarnessGenerator = testHarnessSteps();
+    testHarnessGenerator.next();
+  };
+}
+
+function finishTest() {
+  SimpleTest.executeSoon(function () {
+    clearAllDatabases(function () {
+      SimpleTest.finish();
+    });
+  });
+}
+
+function grabArgAndContinueHandler(arg) {
+  testGenerator.next(arg);
+}
+
+function continueToNextStep() {
+  SimpleTest.executeSoon(function () {
+    testGenerator.next();
+  });
+}
+
+function continueToNextStepSync() {
+  testGenerator.next();
+}
+
+function workerScript() {
+  "use strict";
+
+  self.testGenerator = null;
+
+  self.repr = function (_thing_) {
+    if (typeof _thing_ == "undefined") {
+      return "undefined";
+    }
+
+    let str;
+
+    try {
+      str = _thing_ + "";
+    } catch (e) {
+      return "[" + typeof _thing_ + "]";
+    }
+
+    if (typeof _thing_ == "function") {
+      str = str.replace(/^\s+/, "");
+      let idx = str.indexOf("{");
+      if (idx != -1) {
+        str = str.substr(0, idx) + "{...}";
+      }
+    }
+
+    return str;
+  };
+
+  self.ok = function (_condition_, _name_, _diag_) {
+    self.postMessage({
+      op: "ok",
+      condition: !!_condition_,
+      name: _name_,
+      diag: _diag_,
+    });
+  };
+
+  self.is = function (_a_, _b_, _name_) {
+    let pass = _a_ == _b_;
+    let diag = pass ? "" : "got " + repr(_a_) + ", expected " + repr(_b_);
+    ok(pass, _name_, diag);
+  };
+
+  self.isnot = function (_a_, _b_, _name_) {
+    let pass = _a_ != _b_;
+    let diag = pass ? "" : "didn't expect " + repr(_a_) + ", but got it";
+    ok(pass, _name_, diag);
+  };
+
+  self.todo = function (_condition_, _name_, _diag_) {
+    self.postMessage({
+      op: "todo",
+      condition: !!_condition_,
+      name: _name_,
+      diag: _diag_,
+    });
+  };
+
+  self.info = function (_msg_) {
+    self.postMessage({ op: "info", msg: _msg_ });
+  };
+
+  self.executeSoon = function (_fun_) {
+    var channel = new MessageChannel();
+    channel.port1.postMessage("");
+    channel.port2.onmessage = function (event) {
+      _fun_();
+    };
+  };
+
+  self.finishTest = function () {
+    self.postMessage({ op: "done" });
+  };
+
+  self.grabArgAndContinueHandler = function (_arg_) {
+    testGenerator.next(_arg_);
+  };
+
+  self.continueToNextStep = function () {
+    executeSoon(function () {
+      testGenerator.next();
+    });
+  };
+
+  self.continueToNextStepSync = function () {
+    testGenerator.next();
+  };
+
+  self._clearAllDatabasesCallback = undefined;
+  self.clearAllDatabases = function (_callback_) {
+    self._clearAllDatabasesCallback = _callback_;
+    self.postMessage({ op: "clearAllDatabases" });
+  };
+
+  self.onerror = function (_message_, _file_, _line_) {
+    ok(
+      false,
+      "Worker: uncaught exception [" +
+        _file_ +
+        ":" +
+        _line_ +
+        "]: '" +
+        _message_ +
+        "'"
+    );
+    self.finishTest();
+    self.close();
+    return true;
+  };
+
+  self.onmessage = function (_event_) {
+    let message = _event_.data;
+    switch (message.op) {
+      case "load":
+        info("Worker: loading " + JSON.stringify(message.files));
+        self.importScripts(message.files);
+        self.postMessage({ op: "loaded" });
+        break;
+
+      case "start":
+        executeSoon(function () {
+          info("Worker: starting tests");
+          testGenerator = testSteps();
+          testGenerator.next();
+        });
+        break;
+
+      case "clearAllDatabasesDone":
+        info("Worker: all databases are cleared");
+        if (self._clearAllDatabasesCallback) {
+          self._clearAllDatabasesCallback();
+        }
+        break;
+
+      default:
+        throw new Error(
+          "Received a bad message from parent: " + JSON.stringify(message)
+        );
+    }
+  };
+
+  self.postMessage({ op: "ready" });
+}
diff --git a/dom/quota/test/mochitest/mochitest.toml b/dom/quota/test/mochitest/mochitest.toml
new file mode 100644
index 0000000000..ddc3204b37
--- /dev/null
+++ b/dom/quota/test/mochitest/mochitest.toml
@@ -0,0 +1,18 @@
+[DEFAULT]
+support-files = ["helpers.js"]
+
+["test_simpledb.html"]
+skip-if = [
+  "http3",
+  "http2",
+]
+
+["test_storage_manager_persist_allow.html"]
+fail-if = ["xorigin"]
+scheme = "https"
+
+["test_storage_manager_persist_deny.html"]
+scheme = "https"
+
+["test_storage_manager_persisted.html"]
+scheme = "https"
diff --git a/dom/quota/test/mochitest/test_simpledb.html b/dom/quota/test/mochitest/test_simpledb.html
new file mode 100644
index 0000000000..29ca8be65e
--- /dev/null
+++ b/dom/quota/test/mochitest/test_simpledb.html
@@ -0,0 +1,21 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>SimpleDB Test</title>
+
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <script type="text/javascript" src="helpers.js"></script>
+  <script type="text/javascript">
+    loadScript("dom/quota/test/common/test_simpledb.js");
+  </script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>
diff --git a/dom/quota/test/mochitest/test_storage_manager_persist_allow.html b/dom/quota/test/mochitest/test_storage_manager_persist_allow.html
new file mode 100644
index 0000000000..8477630f21
--- /dev/null
+++ b/dom/quota/test/mochitest/test_storage_manager_persist_allow.html
@@ -0,0 +1,21 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Allow Persist Prompt for StorageManager</title>
+
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <script type="text/javascript" src="helpers.js"></script>
+  <script type="text/javascript">
+    loadScript("dom/quota/test/common/test_storage_manager_persist_allow.js");
+  </script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>
diff --git a/dom/quota/test/mochitest/test_storage_manager_persist_deny.html b/dom/quota/test/mochitest/test_storage_manager_persist_deny.html
new file mode 100644
index 0000000000..2b0fab4423
--- /dev/null
+++ b/dom/quota/test/mochitest/test_storage_manager_persist_deny.html
@@ -0,0 +1,21 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Deny Persist Prompt for StorageManager</title>
+
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <script type="text/javascript" src="helpers.js"></script>
+  <script type="text/javascript">
+    loadScript("dom/quota/test/common/test_storage_manager_persist_deny.js");
+  </script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>
diff --git a/dom/quota/test/mochitest/test_storage_manager_persisted.html b/dom/quota/test/mochitest/test_storage_manager_persisted.html
new file mode 100644
index 0000000000..6e03f33e2d
--- /dev/null
+++ b/dom/quota/test/mochitest/test_storage_manager_persisted.html
@@ -0,0 +1,24 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Storage Manager Persisted Test</title>
+
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <script type="text/javascript" src="helpers.js"></script>
+  <script type="text/javascript">
+    const path = "dom/quota/test/common/test_storage_manager_persisted.js";
+
+    loadScript(path);
+    loadWorkerScript(path);
+  </script>
+
+</head>
+
+<body onload="runTest();"></body>
+
+</html>
diff --git a/dom/quota/test/modules/content/Assert.mjs b/dom/quota/test/modules/content/Assert.mjs
new file mode 100644
index 0000000000..c9b8a11d1a
--- /dev/null
+++ b/dom/quota/test/modules/content/Assert.mjs
@@ -0,0 +1,14 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// This file expectes the simpletest environment to be available in the scope
+// it is loaded into.
+/* eslint-env mozilla/simpletest */
+
+// Just a wrapper around SimpleTest related functions for now.
+export const Assert = {
+  ok,
+  equal: is,
+};
diff --git a/dom/quota/test/modules/content/ModuleLoader.mjs b/dom/quota/test/modules/content/ModuleLoader.mjs
new file mode 100644
index 0000000000..db8a04277d
--- /dev/null
+++ b/dom/quota/test/modules/content/ModuleLoader.mjs
@@ -0,0 +1,65 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// This file expectes the SpecialPowers to be available in the scope
+// it is loaded into.
+/* global SpecialPowers */
+
+export function ModuleLoader(base, depth, proto) {
+  const modules = {};
+
+  const principal = SpecialPowers.wrap(document).nodePrincipal;
+
+  const sharedGlobalSandbox = SpecialPowers.Cu.Sandbox(principal, {
+    invisibleToDebugger: true,
+    sandboxName: "FS Module Loader",
+    sandboxPrototype: proto,
+    wantComponents: false,
+    wantGlobalProperties: [],
+    wantXrays: false,
+  });
+
+  const require = async function (id) {
+    if (modules[id]) {
+      return modules[id].exported_symbols;
+    }
+
+    const url = new URL(depth + id, base);
+
+    const module = Object.create(null, {
+      exported_symbols: {
+        configurable: false,
+        enumerable: true,
+        value: Object.create(null),
+        writable: true,
+      },
+    });
+
+    modules[id] = module;
+
+    const properties = {
+      require_module: require,
+      exported_symbols: module.exported_symbols,
+    };
+
+    // Create a new object in this sandbox, that will be used as the scope
+    // object for this particular module.
+    const sandbox = sharedGlobalSandbox.Object();
+    Object.assign(sandbox, properties);
+
+    SpecialPowers.Services.scriptloader.loadSubScript(url.href, sandbox);
+
+    return module.exported_symbols;
+  };
+
+  const returnObj = {
+    require: {
+      enumerable: true,
+      value: require,
+    },
+  };
+
+  return Object.create(null, returnObj);
+}
diff --git a/dom/quota/test/modules/content/StorageUtils.mjs b/dom/quota/test/modules/content/StorageUtils.mjs
new file mode 100644
index 0000000000..f369484972
--- /dev/null
+++ b/dom/quota/test/modules/content/StorageUtils.mjs
@@ -0,0 +1,71 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// This file expectes the SpecialPowers to be available in the scope
+// it is loaded into.
+/* global SpecialPowers */
+
+class RequestError extends Error {
+  constructor(resultCode, resultName) {
+    super(`Request failed (code: ${resultCode}, name: ${resultName})`);
+    this.name = "RequestError";
+    this.resultCode = resultCode;
+    this.resultName = resultName;
+  }
+}
+
+export async function setStoragePrefs(optionalPrefsToSet) {
+  const prefsToSet = [
+    // Not needed right now, but might be needed in future.
+    // ["dom.quotaManager.testing", true],
+  ];
+
+  if (SpecialPowers.Services.appinfo.OS === "WINNT") {
+    prefsToSet.push(["dom.quotaManager.useDOSDevicePathSyntax", true]);
+  }
+
+  if (optionalPrefsToSet) {
+    prefsToSet.push(...optionalPrefsToSet);
+  }
+
+  await SpecialPowers.pushPrefEnv({ set: prefsToSet });
+}
+
+export async function getUsageForOrigin(principal, fromMemory) {
+  const request = SpecialPowers.Services.qms.getUsageForPrincipal(
+    principal,
+    function () {},
+    fromMemory
+  );
+
+  await new Promise(function (resolve) {
+    request.callback = SpecialPowers.wrapCallback(function () {
+      resolve();
+    });
+  });
+
+  if (request.resultCode != SpecialPowers.Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
+
+export async function clearStoragesForOrigin(principal) {
+  const request =
+    SpecialPowers.Services.qms.clearStoragesForPrincipal(principal);
+
+  await new Promise(function (resolve) {
+    request.callback = SpecialPowers.wrapCallback(function () {
+      resolve();
+    });
+  });
+
+  if (request.resultCode != SpecialPowers.Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
diff --git a/dom/quota/test/modules/content/Utils.mjs b/dom/quota/test/modules/content/Utils.mjs
new file mode 100644
index 0000000000..c6a7415dba
--- /dev/null
+++ b/dom/quota/test/modules/content/Utils.mjs
@@ -0,0 +1,18 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// This file expectes the SpecialPowers to be available in the scope
+// it is loaded into.
+/* global SpecialPowers */
+
+import { getUsageForOrigin } from "./StorageUtils.mjs";
+
+export const Utils = {
+  async getCachedOriginUsage() {
+    const principal = SpecialPowers.wrap(document).nodePrincipal;
+    const result = await getUsageForOrigin(principal, true);
+    return result.usage;
+  },
+};
diff --git a/dom/quota/test/modules/content/UtilsParent.mjs b/dom/quota/test/modules/content/UtilsParent.mjs
new file mode 100644
index 0000000000..f7ebde3c34
--- /dev/null
+++ b/dom/quota/test/modules/content/UtilsParent.mjs
@@ -0,0 +1,21 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+import { Utils } from "./Utils.mjs";
+
+export const UtilsParent = {
+  async OnMessageReceived(worker, msg) {
+    switch (msg.op) {
+      case "getCachedOriginUsage": {
+        const result = await Utils.getCachedOriginUsage();
+        worker.postMessage(result);
+        break;
+      }
+
+      default:
+        throw new Error(`Unknown op ${msg.op}`);
+    }
+  },
+};
diff --git a/dom/quota/test/modules/content/WorkerDriver.mjs b/dom/quota/test/modules/content/WorkerDriver.mjs
new file mode 100644
index 0000000000..0ba74b65f7
--- /dev/null
+++ b/dom/quota/test/modules/content/WorkerDriver.mjs
@@ -0,0 +1,68 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+export async function runTestInWorker(script, base, listener) {
+  return new Promise(function (resolve) {
+    const globalHeadUrl = new URL(
+      "/tests/dom/quota/test/modules/worker/head.js",
+      base
+    );
+
+    let modules = {};
+
+    const worker = new Worker(globalHeadUrl.href);
+
+    worker.onmessage = async function (event) {
+      const data = event.data;
+      const moduleName = data.moduleName;
+      const objectName = data.objectName;
+
+      if (moduleName && objectName) {
+        if (!modules[moduleName]) {
+          // eslint-disable-next-line no-unsanitized/method
+          modules[moduleName] = await import(
+            "/tests/dom/quota/test/modules/" + moduleName + ".mjs"
+          );
+        }
+        await modules[moduleName][objectName].OnMessageReceived(worker, data);
+        return;
+      }
+
+      switch (data.op) {
+        case "ok":
+          listener.onOk(data.value, data.message);
+          break;
+
+        case "is":
+          listener.onIs(data.a, data.b, data.message);
+          break;
+
+        case "info":
+          listener.onInfo(data.message);
+          break;
+
+        case "finish":
+          resolve();
+          break;
+
+        case "failure":
+          listener.onOk(false, "Worker had a failure: " + data.message);
+          resolve();
+          break;
+      }
+    };
+
+    worker.onerror = function (event) {
+      listener.onOk(false, "Worker had an error: " + event.data);
+      resolve();
+    };
+
+    const scriptUrl = new URL(script, base);
+
+    const localHeadUrl = new URL("head.js", scriptUrl);
+
+    worker.postMessage([localHeadUrl.href, scriptUrl.href]);
+  });
+}
diff --git a/dom/quota/test/modules/content/worker/Assert.js b/dom/quota/test/modules/content/worker/Assert.js
new file mode 100644
index 0000000000..7c7e2683ea
--- /dev/null
+++ b/dom/quota/test/modules/content/worker/Assert.js
@@ -0,0 +1,22 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const Assert = {
+  ok(value, message) {
+    postMessage({
+      op: "ok",
+      value: !!value,
+      message,
+    });
+  },
+  equal(a, b, message) {
+    postMessage({
+      op: "is",
+      a,
+      b,
+      message,
+    });
+  },
+};
diff --git a/dom/quota/test/modules/content/worker/ModuleLoader.js b/dom/quota/test/modules/content/worker/ModuleLoader.js
new file mode 100644
index 0000000000..5354c26e34
--- /dev/null
+++ b/dom/quota/test/modules/content/worker/ModuleLoader.js
@@ -0,0 +1,52 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function ModuleLoader(base, depth) {
+  const modules = {};
+
+  const require = async function (id) {
+    if (modules[id]) {
+      return modules[id].exported_symbols;
+    }
+
+    const url = new URL(depth + id, base);
+
+    const module = Object.create(null, {
+      exported_symbols: {
+        configurable: false,
+        enumerable: true,
+        value: Object.create(null),
+        writable: true,
+      },
+    });
+
+    modules[id] = module;
+
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", url.href, false);
+    xhr.responseType = "text";
+    xhr.send();
+
+    let source = xhr.responseText;
+
+    let code = new Function(
+      "require_module",
+      "exported_symbols",
+      `eval(arguments[2] + "\\n//# sourceURL=" + arguments[3] + "\\n")`
+    );
+    code(require, module.exported_symbols, source, url.href);
+
+    return module.exported_symbols;
+  };
+
+  const returnObj = {
+    require: {
+      enumerable: true,
+      value: require,
+    },
+  };
+
+  return Object.create(null, returnObj);
+}
diff --git a/dom/quota/test/modules/content/worker/Utils.js b/dom/quota/test/modules/content/worker/Utils.js
new file mode 100644
index 0000000000..0f8888fc00
--- /dev/null
+++ b/dom/quota/test/modules/content/worker/Utils.js
@@ -0,0 +1,27 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+let UtilsChild;
+
+async function ensureUtilsChild() {
+  if (UtilsChild) {
+    return;
+  }
+
+  const { UtilsChild: importedUtilsChild } = await import(
+    "/tests/dom/quota/test/modules/worker/UtilsChild.mjs"
+  );
+
+  UtilsChild = importedUtilsChild;
+}
+
+const Utils = {
+  async getCachedOriginUsage() {
+    await ensureUtilsChild();
+
+    const result = await UtilsChild.getCachedOriginUsage();
+    return result;
+  },
+};
diff --git a/dom/quota/test/modules/content/worker/UtilsChild.mjs b/dom/quota/test/modules/content/worker/UtilsChild.mjs
new file mode 100644
index 0000000000..db5757bff0
--- /dev/null
+++ b/dom/quota/test/modules/content/worker/UtilsChild.mjs
@@ -0,0 +1,22 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+export const UtilsChild = {
+  async getCachedOriginUsage() {
+    postMessage({
+      moduleName: "UtilsParent",
+      objectName: "UtilsParent",
+      op: "getCachedOriginUsage",
+    });
+
+    return new Promise(function (resolve) {
+      addEventListener("message", async function onMessage(event) {
+        removeEventListener("message", onMessage);
+        const data = event.data;
+        resolve(data);
+      });
+    });
+  },
+};
diff --git a/dom/quota/test/modules/content/worker/head.js b/dom/quota/test/modules/content/worker/head.js
new file mode 100644
index 0000000000..c43d784596
--- /dev/null
+++ b/dom/quota/test/modules/content/worker/head.js
@@ -0,0 +1,57 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/* eslint-env worker */
+
+const Cr = {
+  NS_ERROR_NOT_IMPLEMENTED: 2147500033,
+};
+
+function add_task(func) {
+  if (!add_task.tasks) {
+    add_task.tasks = [];
+    add_task.index = 0;
+  }
+
+  add_task.tasks.push(func);
+}
+
+addEventListener("message", async function onMessage(event) {
+  function info(message) {
+    postMessage({ op: "info", message });
+  }
+
+  function executeSoon(callback) {
+    const channel = new MessageChannel();
+    channel.port1.postMessage("");
+    channel.port2.onmessage = function () {
+      callback();
+    };
+  }
+
+  function runNextTest() {
+    if (add_task.index < add_task.tasks.length) {
+      const task = add_task.tasks[add_task.index++];
+      info("add_task | Entering test " + task.name);
+      task()
+        .then(function () {
+          executeSoon(runNextTest);
+          info("add_task | Leaving test " + task.name);
+        })
+        .catch(function (ex) {
+          postMessage({ op: "failure", message: "" + ex });
+        });
+    } else {
+      postMessage({ op: "finish" });
+    }
+  }
+
+  removeEventListener("message", onMessage);
+
+  const data = event.data;
+  importScripts(...data);
+
+  executeSoon(runNextTest);
+});
diff --git a/dom/quota/test/modules/system/ModuleLoader.sys.mjs b/dom/quota/test/modules/system/ModuleLoader.sys.mjs
new file mode 100644
index 0000000000..d4f8f51c11
--- /dev/null
+++ b/dom/quota/test/modules/system/ModuleLoader.sys.mjs
@@ -0,0 +1,63 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+export function ModuleLoader(base, depth, proto) {
+  const modules = {};
+
+  const principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(
+    Ci.nsIPrincipal
+  );
+
+  const sharedGlobalsandbox = Cu.Sandbox(principal, {
+    invisibleToDebugger: true,
+    sandboxName: "FS Module Loader",
+    sandboxPrototype: proto,
+    wantComponents: false,
+    wantGlobalProperties: [],
+    wantXrays: false,
+  });
+
+  const require = async function (id) {
+    if (modules[id]) {
+      return modules[id].exported_symbols;
+    }
+
+    const url = new URL(depth + id, base);
+
+    const module = Object.create(null, {
+      exported_symbols: {
+        configurable: false,
+        enumerable: true,
+        value: Object.create(null),
+        writable: true,
+      },
+    });
+
+    modules[id] = module;
+
+    const properties = {
+      require_module: require,
+      exported_symbols: module.exported_symbols,
+    };
+
+    // Create a new object in this sandbox, that will be used as the scope
+    // object for this particular module.
+    const sandbox = sharedGlobalsandbox.Object();
+    Object.assign(sandbox, properties);
+
+    Services.scriptloader.loadSubScript(url.href, sandbox);
+
+    return module.exported_symbols;
+  };
+
+  const returnObj = {
+    require: {
+      enumerable: true,
+      value: require,
+    },
+  };
+
+  return Object.create(null, returnObj);
+}
diff --git a/dom/quota/test/modules/system/StorageUtils.sys.mjs b/dom/quota/test/modules/system/StorageUtils.sys.mjs
new file mode 100644
index 0000000000..ddd17e2875
--- /dev/null
+++ b/dom/quota/test/modules/system/StorageUtils.sys.mjs
@@ -0,0 +1,97 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+class RequestError extends Error {
+  constructor(resultCode, resultName) {
+    super(`Request failed (code: ${resultCode}, name: ${resultName})`);
+    this.name = "RequestError";
+    this.resultCode = resultCode;
+    this.resultName = resultName;
+  }
+}
+
+export function setStoragePrefs(optionalPrefsToSet) {
+  const prefsToSet = [["dom.quotaManager.testing", true]];
+
+  if (Services.appinfo.OS === "WINNT") {
+    prefsToSet.push(["dom.quotaManager.useDOSDevicePathSyntax", true]);
+  }
+
+  if (optionalPrefsToSet) {
+    prefsToSet.push(...optionalPrefsToSet);
+  }
+
+  for (const pref of prefsToSet) {
+    Services.prefs.setBoolPref(pref[0], pref[1]);
+  }
+}
+
+export function clearStoragePrefs(optionalPrefsToClear) {
+  const prefsToClear = ["dom.quotaManager.testing", "dom.simpleDB.enabled"];
+
+  if (Services.appinfo.OS === "WINNT") {
+    prefsToClear.push("dom.quotaManager.useDOSDevicePathSyntax");
+  }
+
+  if (optionalPrefsToClear) {
+    prefsToClear.push(...optionalPrefsToClear);
+  }
+
+  for (const pref of prefsToClear) {
+    Services.prefs.clearUserPref(pref);
+  }
+}
+
+export async function getUsageForOrigin(principal, fromMemory) {
+  const request = Services.qms.getUsageForPrincipal(
+    principal,
+    function () {},
+    fromMemory
+  );
+
+  await new Promise(function (resolve) {
+    request.callback = function () {
+      resolve();
+    };
+  });
+
+  if (request.resultCode != Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
+
+export async function clearStoragesForOrigin(principal) {
+  const request = Services.qms.clearStoragesForPrincipal(principal);
+
+  await new Promise(function (resolve) {
+    request.callback = function () {
+      resolve();
+    };
+  });
+
+  if (request.resultCode != Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
+
+export async function resetStorage() {
+  const request = Services.qms.reset();
+
+  await new Promise(function (resolve) {
+    request.callback = function () {
+      resolve();
+    };
+  });
+
+  if (request.resultCode != Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}
diff --git a/dom/quota/test/modules/system/Utils.sys.mjs b/dom/quota/test/modules/system/Utils.sys.mjs
new file mode 100644
index 0000000000..8c5430aa06
--- /dev/null
+++ b/dom/quota/test/modules/system/Utils.sys.mjs
@@ -0,0 +1,38 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+import {
+  getUsageForOrigin,
+  resetStorage,
+} from "resource://testing-common/dom/quota/test/modules/StorageUtils.sys.mjs";
+
+export const Utils = {
+  async getCachedOriginUsage() {
+    const principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(
+      Ci.nsIPrincipal
+    );
+    const result = await getUsageForOrigin(principal, true);
+    return result.usage;
+  },
+
+  async shrinkStorageSize(size) {
+    Services.prefs.setIntPref(
+      "dom.quotaManager.temporaryStorage.fixedLimit",
+      size
+    );
+
+    const result = await resetStorage();
+    return result;
+  },
+
+  async restoreStorageSize() {
+    Services.prefs.clearUserPref(
+      "dom.quotaManager.temporaryStorage.fixedLimit"
+    );
+
+    const result = await resetStorage();
+    return result;
+  },
+};
diff --git a/dom/quota/test/modules/system/UtilsParent.sys.mjs b/dom/quota/test/modules/system/UtilsParent.sys.mjs
new file mode 100644
index 0000000000..41ca7e2940
--- /dev/null
+++ b/dom/quota/test/modules/system/UtilsParent.sys.mjs
@@ -0,0 +1,32 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+import { Utils } from "resource://testing-common/dom/quota/test/modules/Utils.sys.mjs";
+
+export const UtilsParent = {
+  async OnMessageReceived(worker, msg) {
+    switch (msg.op) {
+      case "getCachedOriginUsage": {
+        const result = await Utils.getCachedOriginUsage();
+        worker.postMessage(result);
+        break;
+      }
+      case "shrinkStorageSize": {
+        const result = await Utils.shrinkStorageSize(msg.size);
+        worker.postMessage(result);
+        break;
+      }
+
+      case "restoreStorageSize": {
+        const result = await Utils.restoreStorageSize();
+        worker.postMessage(result);
+        break;
+      }
+
+      default:
+        throw new Error(`Unknown op ${msg.op}`);
+    }
+  },
+};
diff --git a/dom/quota/test/modules/system/WorkerDriver.sys.mjs b/dom/quota/test/modules/system/WorkerDriver.sys.mjs
new file mode 100644
index 0000000000..60e6790760
--- /dev/null
+++ b/dom/quota/test/modules/system/WorkerDriver.sys.mjs
@@ -0,0 +1,68 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+export async function runTestInWorker(script, base, listener) {
+  return new Promise(function (resolve) {
+    const globalHeadUrl = new URL(
+      "resource://testing-common/dom/quota/test/modules/worker/head.js"
+    );
+
+    let modules = {};
+
+    const worker = new Worker(globalHeadUrl.href);
+
+    worker.onmessage = async function (event) {
+      const data = event.data;
+      const moduleName = data.moduleName;
+      const objectName = data.objectName;
+
+      if (moduleName && objectName) {
+        if (!modules[moduleName]) {
+          modules[moduleName] = ChromeUtils.importESModule(
+            "resource://testing-common/dom/quota/test/modules/" +
+              moduleName +
+              ".sys.mjs"
+          );
+        }
+        await modules[moduleName][objectName].OnMessageReceived(worker, data);
+        return;
+      }
+
+      switch (data.op) {
+        case "ok":
+          listener.onOk(data.value, data.message);
+          break;
+
+        case "is":
+          listener.onIs(data.a, data.b, data.message);
+          break;
+
+        case "info":
+          listener.onInfo(data.message);
+          break;
+
+        case "finish":
+          resolve();
+          break;
+
+        case "failure":
+          listener.onOk(false, "Worker had a failure: " + data.message);
+          resolve();
+          break;
+      }
+    };
+
+    worker.onerror = function (event) {
+      listener.onOk(false, "Worker had an error: " + event.data);
+      resolve();
+    };
+
+    const scriptUrl = new URL(script, base);
+
+    const localHeadUrl = new URL("head.js", scriptUrl);
+
+    worker.postMessage([localHeadUrl.href, scriptUrl.href]);
+  });
+}
diff --git a/dom/quota/test/modules/system/worker/.eslintrc.js b/dom/quota/test/modules/system/worker/.eslintrc.js
new file mode 100644
index 0000000000..505e079c57
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/.eslintrc.js
@@ -0,0 +1,21 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+module.exports = {
+  env: {
+    worker: true,
+  },
+
+  overrides: [
+    {
+      files: ["head.js"],
+      env: {
+        worker: true,
+      },
+    },
+  ],
+};
diff --git a/dom/quota/test/modules/system/worker/Assert.js b/dom/quota/test/modules/system/worker/Assert.js
new file mode 100644
index 0000000000..7c7e2683ea
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/Assert.js
@@ -0,0 +1,22 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const Assert = {
+  ok(value, message) {
+    postMessage({
+      op: "ok",
+      value: !!value,
+      message,
+    });
+  },
+  equal(a, b, message) {
+    postMessage({
+      op: "is",
+      a,
+      b,
+      message,
+    });
+  },
+};
diff --git a/dom/quota/test/modules/system/worker/ModuleLoader.js b/dom/quota/test/modules/system/worker/ModuleLoader.js
new file mode 100644
index 0000000000..b79f3ff5b9
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/ModuleLoader.js
@@ -0,0 +1,52 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function ModuleLoader(base, depth, proto) {
+  const modules = {};
+
+  const require = async function (id) {
+    if (modules[id]) {
+      return modules[id].exported_symbols;
+    }
+
+    const url = new URL(depth + id, base);
+
+    const module = Object.create(null, {
+      exported_symbols: {
+        configurable: false,
+        enumerable: true,
+        value: Object.create(null),
+        writable: true,
+      },
+    });
+
+    modules[id] = module;
+
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", url.href, false);
+    xhr.responseType = "text";
+    xhr.send();
+
+    let source = xhr.responseText;
+
+    let code = new Function(
+      "require_module",
+      "exported_symbols",
+      `eval(arguments[2] + "\\n//# sourceURL=" + arguments[3] + "\\n")`
+    );
+    code(require, module.exported_symbols, source, url.href);
+
+    return module.exported_symbols;
+  };
+
+  const returnObj = {
+    require: {
+      enumerable: true,
+      value: require,
+    },
+  };
+
+  return Object.create(null, returnObj);
+}
diff --git a/dom/quota/test/modules/system/worker/Utils.js b/dom/quota/test/modules/system/worker/Utils.js
new file mode 100644
index 0000000000..b8e6224bf4
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/Utils.js
@@ -0,0 +1,41 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+let UtilsChild;
+
+async function ensureUtilsChild() {
+  if (UtilsChild) {
+    return;
+  }
+
+  const { UtilsChild: importedUtilsChild } = await import(
+    "/dom/quota/test/modules/worker/UtilsChild.mjs"
+  );
+
+  UtilsChild = importedUtilsChild;
+}
+
+const Utils = {
+  async getCachedOriginUsage() {
+    await ensureUtilsChild();
+
+    const result = await UtilsChild.getCachedOriginUsage();
+    return result;
+  },
+
+  async shrinkStorageSize(size) {
+    await ensureUtilsChild();
+
+    const result = await UtilsChild.shrinkStorageSize(size);
+    return result;
+  },
+
+  async restoreStorageSize() {
+    await ensureUtilsChild();
+
+    const result = await UtilsChild.restoreStorageSize();
+    return result;
+  },
+};
diff --git a/dom/quota/test/modules/system/worker/UtilsChild.mjs b/dom/quota/test/modules/system/worker/UtilsChild.mjs
new file mode 100644
index 0000000000..d3b5455a59
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/UtilsChild.mjs
@@ -0,0 +1,52 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function _sendMessage(messageBody) {
+  const messageHeader = {
+    moduleName: "UtilsParent",
+    objectName: "UtilsParent",
+  };
+
+  const message = { ...messageHeader, ...messageBody };
+
+  postMessage(message);
+}
+
+function _recvMessage() {
+  return new Promise(function (resolve) {
+    addEventListener("message", async function onMessage(event) {
+      removeEventListener("message", onMessage);
+      const data = event.data;
+      resolve(data);
+    });
+  });
+}
+
+export const UtilsChild = {
+  async getCachedOriginUsage() {
+    _sendMessage({
+      op: "getCachedOriginUsage",
+    });
+
+    return _recvMessage();
+  },
+
+  async shrinkStorageSize(size) {
+    _sendMessage({
+      op: "shrinkStorageSize",
+      size,
+    });
+
+    return _recvMessage();
+  },
+
+  async restoreStorageSize() {
+    _sendMessage({
+      op: "restoreStorageSize",
+    });
+
+    return _recvMessage();
+  },
+};
diff --git a/dom/quota/test/modules/system/worker/head.js b/dom/quota/test/modules/system/worker/head.js
new file mode 100644
index 0000000000..c415e0c56b
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/head.js
@@ -0,0 +1,56 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// eslint-disable-next-line mozilla/no-define-cc-etc
+const Cr = {
+  NS_ERROR_NOT_IMPLEMENTED: 2147500033,
+};
+
+function add_task(func) {
+  if (!add_task.tasks) {
+    add_task.tasks = [];
+    add_task.index = 0;
+  }
+
+  add_task.tasks.push(func);
+}
+
+addEventListener("message", async function onMessage(event) {
+  function info(message) {
+    postMessage({ op: "info", message });
+  }
+
+  function executeSoon(callback) {
+    const channel = new MessageChannel();
+    channel.port1.postMessage("");
+    channel.port2.onmessage = function () {
+      callback();
+    };
+  }
+
+  function runNextTest() {
+    if (add_task.index < add_task.tasks.length) {
+      const task = add_task.tasks[add_task.index++];
+      info("add_task | Entering test " + task.name);
+      task()
+        .then(function () {
+          executeSoon(runNextTest);
+          info("add_task | Leaving test " + task.name);
+        })
+        .catch(function (ex) {
+          postMessage({ op: "failure", message: "" + ex });
+        });
+    } else {
+      postMessage({ op: "finish" });
+    }
+  }
+
+  removeEventListener("message", onMessage);
+
+  const data = event.data;
+  importScripts(...data);
+
+  executeSoon(runNextTest);
+});
diff --git a/dom/quota/test/moz.build b/dom/quota/test/moz.build
new file mode 100644
index 0000000000..4f7fdc88c8
--- /dev/null
+++ b/dom/quota/test/moz.build
@@ -0,0 +1,86 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+TEST_DIRS += ["gtest"]
+
+BROWSER_CHROME_MANIFESTS += ["browser/browser.toml"]
+
+MARIONETTE_MANIFESTS += ["marionette/manifest.toml"]
+
+MOCHITEST_MANIFESTS += ["mochitest/mochitest.toml"]
+
+XPCSHELL_TESTS_MANIFESTS += [
+    "xpcshell/caching/xpcshell.toml",
+    "xpcshell/telemetry/xpcshell.toml",
+    "xpcshell/upgrades/xpcshell.toml",
+    "xpcshell/xpcshell.toml",
+]
+
+TEST_HARNESS_FILES.testing.mochitest.browser.dom.quota.test.common += [
+    "common/browser.js",
+    "common/content.js",
+    "common/file.js",
+    "common/global.js",
+    "common/nestedtest.js",
+    "common/system.js",
+]
+
+TEST_HARNESS_FILES.testing.mochitest.tests.dom.quota.test.common += [
+    "common/content.js",
+    "common/file.js",
+    "common/global.js",
+    "common/mochitest.js",
+    "common/test_simpledb.js",
+    "common/test_storage_manager_persist_allow.js",
+    "common/test_storage_manager_persist_deny.js",
+    "common/test_storage_manager_persisted.js",
+]
+
+TEST_HARNESS_FILES.testing.mochitest.tests.dom.quota.test.modules += [
+    "modules/content/Assert.mjs",
+    "modules/content/ModuleLoader.mjs",
+    "modules/content/StorageUtils.mjs",
+    "modules/content/Utils.mjs",
+    "modules/content/UtilsParent.mjs",
+    "modules/content/WorkerDriver.mjs",
+]
+
+TEST_HARNESS_FILES.testing.mochitest.tests.dom.quota.test.modules.worker += [
+    "modules/content/worker/Assert.js",
+    "modules/content/worker/head.js",
+    "modules/content/worker/ModuleLoader.js",
+    "modules/content/worker/Utils.js",
+    "modules/content/worker/UtilsChild.mjs",
+]
+
+TEST_HARNESS_FILES.xpcshell.dom.quota.test.common += [
+    "common/file.js",
+    "common/global.js",
+    "common/system.js",
+    "common/test_simpledb.js",
+    "common/xpcshell.js",
+]
+
+TEST_HARNESS_FILES.xpcshell.dom.quota.test.xpcshell.common += [
+    "xpcshell/common/head.js",
+    "xpcshell/common/utils.js",
+]
+
+TESTING_JS_MODULES.dom.quota.test.modules += [
+    "modules/system/ModuleLoader.sys.mjs",
+    "modules/system/StorageUtils.sys.mjs",
+    "modules/system/Utils.sys.mjs",
+    "modules/system/UtilsParent.sys.mjs",
+    "modules/system/WorkerDriver.sys.mjs",
+]
+
+TESTING_JS_MODULES.dom.quota.test.modules.worker += [
+    "modules/system/worker/Assert.js",
+    "modules/system/worker/head.js",
+    "modules/system/worker/ModuleLoader.js",
+    "modules/system/worker/Utils.js",
+    "modules/system/worker/UtilsChild.mjs",
+]
diff --git a/dom/quota/test/xpcshell/basics_profile.zip b/dom/quota/test/xpcshell/basics_profile.zip
new file mode 100644
index 0000000000..bbdb0f50cf
--- /dev/null
+++ b/dom/quota/test/xpcshell/basics_profile.zip
diff --git a/dom/quota/test/xpcshell/caching/groupMismatch_profile.zip b/dom/quota/test/xpcshell/caching/groupMismatch_profile.zip
new file mode 100644
index 0000000000..8124e589de
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/groupMismatch_profile.zip
diff --git a/dom/quota/test/xpcshell/caching/head.js b/dom/quota/test/xpcshell/caching/head.js
new file mode 100644
index 0000000000..5c36d82ca6
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/head.js
@@ -0,0 +1,14 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../../";
+
+loadScript("dom/quota/test/xpcshell/common/head.js");
+
+function loadScript(path) {
+  let uri = Services.io.newFileURI(do_get_file(depth + path));
+  Services.scriptloader.loadSubScript(uri.spec);
+}
diff --git a/dom/quota/test/xpcshell/caching/make_unsetLastAccessTime.js b/dom/quota/test/xpcshell/caching/make_unsetLastAccessTime.js
new file mode 100644
index 0000000000..9be377e4f3
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/make_unsetLastAccessTime.js
@@ -0,0 +1,25 @@
+/*
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+*/
+
+async function testSteps() {
+  const originDirPath = "storage/default/https+++foo.example.com";
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Creating an empty origin directory");
+
+  let originDir = getRelativeFile(originDirPath);
+  originDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  // The metadata file should be now restored.
+}
diff --git a/dom/quota/test/xpcshell/caching/removedOrigin_profile.zip b/dom/quota/test/xpcshell/caching/removedOrigin_profile.zip
new file mode 100644
index 0000000000..a5ccc05aa9
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/removedOrigin_profile.zip
diff --git a/dom/quota/test/xpcshell/caching/test_groupMismatch.js b/dom/quota/test/xpcshell/caching/test_groupMismatch.js
new file mode 100644
index 0000000000..3f8e843798
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/test_groupMismatch.js
@@ -0,0 +1,45 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that the group loaded from the origin table
+ * gets updated (if necessary) before quota initialization for the given origin.
+ */
+
+async function testSteps() {
+  const principal = getPrincipal("https://foo.bar.mozilla-iot.org");
+  const originUsage = 100;
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains one initialized origin directory with simple database
+  // data, a script for origin initialization and the storage database:
+  // - storage/default/https+++foo.bar.mozilla-iot.org
+  // - create_db.js
+  // - storage.sqlite
+  // The file create_db.js in the package was run locally, specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  //   mach xpcshell-test --interactive dom/quota/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Manually change the group and accessed values in the origin table in
+  //    storage.sqlite by running this SQL statement:
+  //    UPDATE origin SET group_ = 'mozilla-iot.org', accessed = 0
+  // 2. Manually change the group in .metadata-v2 from "bar.mozilla-iot.org" to
+  //    "mozilla-iot.org".
+  // 3. Remove the folder "storage/temporary".
+  // 4. Remove the file "storage/ls-archive.sqlite".
+  installPackage("groupMismatch_profile");
+
+  request = getOriginUsage(principal, /* fromMemory */ true);
+  await requestFinished(request);
+
+  is(request.result.usage, originUsage, "Correct origin usage");
+}
diff --git a/dom/quota/test/xpcshell/caching/test_removedOrigin.js b/dom/quota/test/xpcshell/caching/test_removedOrigin.js
new file mode 100644
index 0000000000..8b5702ad9c
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/test_removedOrigin.js
@@ -0,0 +1,61 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * Verify that temporary storage initialization will notice a removed origin
+ * that the cache has data for and which indicates the origin was accessed
+ * during the last run. Currently, we expect LoadQuotaFromCache to fail because
+ * of this inconsistency and to fall back to full initialization.
+ */
+
+async function testSteps() {
+  const principal = getPrincipal("http://example.com");
+  const originUsage = 0;
+
+  info("Setting pref");
+
+  // The packaged profile will have a different build ID and we would treat the
+  // cache as invalid if we didn't bypass this check.
+  Services.prefs.setBoolPref("dom.quotaManager.caching.checkBuildId", false);
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains empty default storage, a script for origin
+  // initialization and the storage database:
+  // - storage/default
+  // - create_db.js
+  // - storage.sqlite
+  // The file create_db.js in the package was run locally, specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  //   mach xpcshell-test --interactive dom/quota/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/default/http+++example.com".
+  // 2. Remove the folder "storage/temporary".
+  // 3. Remove the file "storage/ls-archive.sqlite".
+  installPackage("removedOrigin_profile");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Getting origin usage");
+
+  request = getOriginUsage(principal, /* fromMemory */ true);
+  await requestFinished(request);
+
+  is(request.result.usage, originUsage, "Correct origin usage");
+}
diff --git a/dom/quota/test/xpcshell/caching/test_unsetLastAccessTime.js b/dom/quota/test/xpcshell/caching/test_unsetLastAccessTime.js
new file mode 100644
index 0000000000..2199201b8a
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/test_unsetLastAccessTime.js
@@ -0,0 +1,47 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const principal = getPrincipal("https://foo.example.com/");
+
+  info("Setting pref");
+
+  // The packaged profile will have a different build ID and we would treat the
+  // cache as invalid if we didn't bypass this check.
+  Services.prefs.setBoolPref("dom.quotaManager.caching.checkBuildId", false);
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains one initialized origin directory and the storage
+  // database:
+  // - storage/default/https+++foo.example.com
+  // - storage.sqlite
+  // The file make_unsetLastAccessTime.js was run locally, specifically it was
+  // temporarily enabled in xpcshell.ini and then executed:
+  // mach test --interactive dom/quota/test/xpcshell/caching/make_unsetLastAccessTime.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/temporary".
+  // 2. Remove the file "storage/ls-archive.sqlite".
+  installPackage("unsetLastAccessTime_profile");
+
+  info("Getting full origin metadata");
+
+  request = getFullOriginMetadata("default", principal);
+  await requestFinished(request);
+
+  info("Verifying last access time");
+
+  Assert.notEqual(
+    BigInt(request.result.lastAccessTime),
+    INT64_MIN,
+    "Correct last access time"
+  );
+}
diff --git a/dom/quota/test/xpcshell/caching/unsetLastAccessTime_profile.zip b/dom/quota/test/xpcshell/caching/unsetLastAccessTime_profile.zip
new file mode 100644
index 0000000000..2b14ca7276
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/unsetLastAccessTime_profile.zip
diff --git a/dom/quota/test/xpcshell/caching/xpcshell.toml b/dom/quota/test/xpcshell/caching/xpcshell.toml
new file mode 100644
index 0000000000..4901ed16a7
--- /dev/null
+++ b/dom/quota/test/xpcshell/caching/xpcshell.toml
@@ -0,0 +1,16 @@
+[DEFAULT]
+head = "head.js"
+support-files = [
+  "groupMismatch_profile.zip",
+  "removedOrigin_profile.zip",
+]
+
+["make_unsetLastAccessTime.js"]
+skip-if = ["true"] # Only used for recreating unsetLastAccessTime_profile.zip
+
+["test_groupMismatch.js"]
+
+["test_removedOrigin.js"]
+
+["test_unsetLastAccessTime.js"]
+support-files = ["unsetLastAccessTime_profile.zip"]
diff --git a/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.json b/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.json
new file mode 100644
index 0000000000..6df0726773
--- /dev/null
+++ b/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.json
@@ -0,0 +1,729 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterClearByOriginPrefix",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterClearByOriginPrefix_persistent",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterClearByOriginPrefix_default",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterClearByOriginPrefix_temporary",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              },
+              {
+                "name": "http+++example.com^userContextId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": "cache", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "ls", "dir": true },
+                  { "name": "fs", "dir": true }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.zip b/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.zip
new file mode 100644
index 0000000000..b6a3877d3e
--- /dev/null
+++ b/dom/quota/test/xpcshell/clearStoragesForOriginPrefix_profile.zip
diff --git a/dom/quota/test/xpcshell/clearStoragesForPrincipal_profile.zip b/dom/quota/test/xpcshell/clearStoragesForPrincipal_profile.zip
new file mode 100644
index 0000000000..7d7985ddd0
--- /dev/null
+++ b/dom/quota/test/xpcshell/clearStoragesForPrincipal_profile.zip
diff --git a/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.json b/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.json
new file mode 100644
index 0000000000..b4b8e3afda
--- /dev/null
+++ b/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.json
@@ -0,0 +1,152 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "private",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com^privateBrowsingId=1",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterClearPrivateBrowsing",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "cache", "dir": true },
+                  { "name": "fs", "dir": true },
+                  { "name": "idb", "dir": true },
+                  { "name": "ls", "dir": true },
+                  { "name": "sdb", "dir": true },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.zip b/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.zip
new file mode 100644
index 0000000000..4bbb8a5c77
--- /dev/null
+++ b/dom/quota/test/xpcshell/clearStoragesForPrivateBrowsing_profile.zip
diff --git a/dom/quota/test/xpcshell/common/head.js b/dom/quota/test/xpcshell/common/head.js
new file mode 100644
index 0000000000..000236b3cd
--- /dev/null
+++ b/dom/quota/test/xpcshell/common/head.js
@@ -0,0 +1,665 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const NS_OK = Cr.NS_OK;
+const NS_ERROR_FAILURE = Cr.NS_ERROR_FAILURE;
+const NS_ERROR_UNEXPECTED = Cr.NS_ERROR_UNEXPECTED;
+const NS_ERROR_FILE_NO_DEVICE_SPACE = Cr.NS_ERROR_FILE_NO_DEVICE_SPACE;
+
+const loggingEnabled = false;
+
+var testGenerator;
+
+loadScript("dom/quota/test/common/xpcshell.js");
+
+function log(msg) {
+  if (loggingEnabled) {
+    info(msg);
+  }
+}
+
+function is(a, b, msg) {
+  Assert.equal(a, b, msg);
+}
+
+function ok(cond, msg) {
+  Assert.ok(!!cond, msg);
+}
+
+function todo(cond, msg) {
+  todo_check_true(cond);
+}
+
+function run_test() {
+  runTest();
+}
+
+if (!this.runTest) {
+  this.runTest = function () {
+    do_get_profile();
+
+    enableStorageTesting();
+    enableTesting();
+
+    // In order to support converting tests to using async functions from using
+    // generator functions, we detect async functions by checking the name of
+    // function's constructor.
+    Assert.ok(
+      typeof testSteps === "function",
+      "There should be a testSteps function"
+    );
+    if (testSteps.constructor.name === "AsyncFunction") {
+      // Do run our existing cleanup function that would normally be called by
+      // the generator's call to finishTest().
+      registerCleanupFunction(function () {
+        resetStorageTesting();
+        resetTesting();
+      });
+
+      add_task(testSteps);
+
+      // Since we defined run_test, we must invoke run_next_test() to start the
+      // async test.
+      run_next_test();
+    } else {
+      Assert.ok(
+        testSteps.constructor.name === "GeneratorFunction",
+        "Unsupported function type"
+      );
+
+      do_test_pending();
+
+      testGenerator = testSteps();
+      testGenerator.next();
+    }
+  };
+}
+
+function finishTest() {
+  resetStorageTesting();
+  resetTesting();
+
+  executeSoon(function () {
+    do_test_finished();
+  });
+}
+
+function grabArgAndContinueHandler(arg) {
+  testGenerator.next(arg);
+}
+
+function continueToNextStep() {
+  executeSoon(function () {
+    testGenerator.next();
+  });
+}
+
+function continueToNextStepSync() {
+  testGenerator.next();
+}
+
+function enableTesting() {
+  SpecialPowers.setBoolPref(
+    "dom.storage.enable_unsupported_legacy_implementation",
+    false
+  );
+}
+
+function resetTesting() {
+  SpecialPowers.clearUserPref(
+    "dom.storage.enable_unsupported_legacy_implementation"
+  );
+}
+
+function setGlobalLimit(globalLimit) {
+  SpecialPowers.setIntPref(
+    "dom.quotaManager.temporaryStorage.fixedLimit",
+    globalLimit
+  );
+}
+
+function resetGlobalLimit() {
+  SpecialPowers.clearUserPref("dom.quotaManager.temporaryStorage.fixedLimit");
+}
+
+function storageInitialized(callback) {
+  let request = SpecialPowers._getQuotaManager().storageInitialized();
+  request.callback = callback;
+
+  return request;
+}
+
+function temporaryStorageInitialized(callback) {
+  let request = SpecialPowers._getQuotaManager().temporaryStorageInitialized();
+  request.callback = callback;
+
+  return request;
+}
+
+function init(callback) {
+  let request = SpecialPowers._getQuotaManager().init();
+  request.callback = callback;
+
+  return request;
+}
+
+function initTemporaryStorage(callback) {
+  let request = SpecialPowers._getQuotaManager().initTemporaryStorage();
+  request.callback = callback;
+
+  return request;
+}
+
+function initPersistentOrigin(principal, callback) {
+  let request =
+    SpecialPowers._getQuotaManager().initializePersistentOrigin(principal);
+  request.callback = callback;
+
+  return request;
+}
+
+function initTemporaryOrigin(persistence, principal, callback) {
+  let request = SpecialPowers._getQuotaManager().initializeTemporaryOrigin(
+    persistence,
+    principal
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function initPersistentClient(principal, client, callback) {
+  let request = SpecialPowers._getQuotaManager().initializePersistentClient(
+    principal,
+    client
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function initTemporaryClient(persistence, principal, client, callback) {
+  let request = SpecialPowers._getQuotaManager().initializeTemporaryClient(
+    persistence,
+    principal,
+    client
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function getFullOriginMetadata(persistence, principal, callback) {
+  const request = SpecialPowers._getQuotaManager().getFullOriginMetadata(
+    persistence,
+    principal
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function clearClient(principal, persistence, client, callback) {
+  let request = SpecialPowers._getQuotaManager().clearStoragesForPrincipal(
+    principal,
+    persistence,
+    client
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function clearOrigin(principal, persistence, callback) {
+  let request = SpecialPowers._getQuotaManager().clearStoragesForPrincipal(
+    principal,
+    persistence
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function clearOriginsByPrefix(principal, persistence, callback) {
+  let request = SpecialPowers._getQuotaManager().clearStoragesForOriginPrefix(
+    principal,
+    persistence
+  );
+  request.callback = callback;
+
+  return request;
+}
+
+function clearPrivateBrowsing(callback) {
+  let request =
+    SpecialPowers._getQuotaManager().clearStoragesForPrivateBrowsing();
+  request.callback = callback;
+
+  return request;
+}
+
+function resetClient(principal, client) {
+  let request = Services.qms.resetStoragesForPrincipal(
+    principal,
+    "default",
+    client
+  );
+
+  return request;
+}
+
+function persist(principal, callback) {
+  let request = SpecialPowers._getQuotaManager().persist(principal);
+  request.callback = callback;
+
+  return request;
+}
+
+function persisted(principal, callback) {
+  let request = SpecialPowers._getQuotaManager().persisted(principal);
+  request.callback = callback;
+
+  return request;
+}
+
+function estimateOrigin(principal, callback) {
+  let request = SpecialPowers._getQuotaManager().estimate(principal);
+  request.callback = callback;
+
+  return request;
+}
+
+function listOrigins(callback) {
+  let request = SpecialPowers._getQuotaManager().listOrigins(callback);
+  request.callback = callback;
+
+  return request;
+}
+
+function getPersistedFromMetadata(readBuffer) {
+  const persistedPosition = 8; // Persisted state is stored in the 9th byte
+  let view =
+    readBuffer instanceof Uint8Array ? readBuffer : new Uint8Array(readBuffer);
+
+  return !!view[persistedPosition];
+}
+
+function grabResultAndContinueHandler(request) {
+  testGenerator.next(request.result);
+}
+
+function grabUsageAndContinueHandler(request) {
+  testGenerator.next(request.result.usage);
+}
+
+function getUsage(usageHandler, getAll) {
+  let request = SpecialPowers._getQuotaManager().getUsage(usageHandler, getAll);
+
+  return request;
+}
+
+function getOriginUsage(principal, fromMemory = false) {
+  let request = Services.qms.getUsageForPrincipal(
+    principal,
+    function () {},
+    fromMemory
+  );
+
+  return request;
+}
+
+function getCurrentUsage(usageHandler) {
+  let principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(
+    Ci.nsIPrincipal
+  );
+  let request = SpecialPowers._getQuotaManager().getUsageForPrincipal(
+    principal,
+    usageHandler
+  );
+
+  return request;
+}
+
+function getPrincipal(url, attr = {}) {
+  let uri = Cc["@mozilla.org/network/io-service;1"]
+    .getService(Ci.nsIIOService)
+    .newURI(url);
+  let ssm = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(
+    Ci.nsIScriptSecurityManager
+  );
+  return ssm.createContentPrincipal(uri, attr);
+}
+
+var SpecialPowers = {
+  getBoolPref(prefName) {
+    return this._getPrefs().getBoolPref(prefName);
+  },
+
+  setBoolPref(prefName, value) {
+    this._getPrefs().setBoolPref(prefName, value);
+  },
+
+  setIntPref(prefName, value) {
+    this._getPrefs().setIntPref(prefName, value);
+  },
+
+  clearUserPref(prefName) {
+    this._getPrefs().clearUserPref(prefName);
+  },
+
+  _getPrefs() {
+    let prefService = Cc["@mozilla.org/preferences-service;1"].getService(
+      Ci.nsIPrefService
+    );
+    return prefService.getBranch(null);
+  },
+
+  _getQuotaManager() {
+    return Cc["@mozilla.org/dom/quota-manager-service;1"].getService(
+      Ci.nsIQuotaManagerService
+    );
+  },
+};
+
+function installPackages(packageRelativePaths) {
+  if (packageRelativePaths.length != 2) {
+    throw new Error("Unsupported number of package relative paths");
+  }
+
+  for (const packageRelativePath of packageRelativePaths) {
+    installPackage(packageRelativePath);
+  }
+}
+
+// Take current storage structure on disk and compare it with the expected
+// structure. The expected structure is defined in JSON and consists of a per
+// test package definition and a shared package definition. The shared package
+// definition should contain unknown stuff which needs to be properly handled
+// in all situations.
+function verifyStorage(packageDefinitionRelativePaths, key, sharedKey) {
+  if (packageDefinitionRelativePaths.length != 2) {
+    throw new Error("Unsupported number of package definition relative paths");
+  }
+
+  function verifyEntries(entries, name, indent = "") {
+    log(`${indent}Verifying ${name} entries`);
+
+    indent += "  ";
+
+    for (const entry of entries) {
+      const maybeName = entry.name;
+
+      log(`${indent}Verifying entry ${maybeName}`);
+
+      let hasName = false;
+      let hasDir = false;
+      let hasEntries = false;
+
+      for (const property in entry) {
+        switch (property) {
+          case "note":
+          case "todo":
+            break;
+
+          case "name":
+            hasName = true;
+            break;
+
+          case "dir":
+            hasDir = true;
+            break;
+
+          case "entries":
+            hasEntries = true;
+            break;
+
+          default:
+            throw new Error(`Unknown property ${property}`);
+        }
+      }
+
+      if (!hasName) {
+        throw new Error("An entry must have the name property");
+      }
+
+      if (!hasDir) {
+        throw new Error("An entry must have the dir property");
+      }
+
+      if (hasEntries && !entry.dir) {
+        throw new Error("An entry can't have entries if it's not a directory");
+      }
+
+      if (hasEntries) {
+        verifyEntries(entry.entries, entry.name, indent);
+      }
+    }
+  }
+
+  function getCurrentEntries() {
+    log("Getting current entries");
+
+    function getEntryForFile(file) {
+      let entry = {
+        name: file.leafName,
+        dir: file.isDirectory(),
+      };
+
+      if (file.isDirectory()) {
+        const enumerator = file.directoryEntries;
+        let nextFile;
+        while ((nextFile = enumerator.nextFile)) {
+          if (!entry.entries) {
+            entry.entries = [];
+          }
+          entry.entries.push(getEntryForFile(nextFile));
+        }
+      }
+
+      return entry;
+    }
+
+    let entries = [];
+
+    let file = getRelativeFile("indexedDB");
+    if (file.exists()) {
+      entries.push(getEntryForFile(file));
+    }
+
+    file = getRelativeFile("storage");
+    if (file.exists()) {
+      entries.push(getEntryForFile(file));
+    }
+
+    file = getRelativeFile("storage.sqlite");
+    if (file.exists()) {
+      entries.push(getEntryForFile(file));
+    }
+
+    verifyEntries(entries, "current");
+
+    return entries;
+  }
+
+  function getEntriesFromPackageDefinition(
+    packageDefinitionRelativePath,
+    lookupKey
+  ) {
+    log(`Getting ${lookupKey} entries from ${packageDefinitionRelativePath}`);
+
+    const currentDir = Services.dirsvc.get("CurWorkD", Ci.nsIFile);
+    const file = getRelativeFile(
+      packageDefinitionRelativePath + ".json",
+      currentDir
+    );
+
+    const fileInputStream = Cc[
+      "@mozilla.org/network/file-input-stream;1"
+    ].createInstance(Ci.nsIFileInputStream);
+    fileInputStream.init(file, -1, -1, 0);
+
+    const scriptableInputStream = Cc[
+      "@mozilla.org/scriptableinputstream;1"
+    ].createInstance(Ci.nsIScriptableInputStream);
+    scriptableInputStream.init(fileInputStream);
+
+    const data = scriptableInputStream.readBytes(
+      scriptableInputStream.available()
+    );
+
+    const obj = JSON.parse(data);
+
+    const result = obj.find(({ key: elementKey }) => elementKey == lookupKey);
+
+    if (!result) {
+      throw new Error("The file doesn't contain an element for given key");
+    }
+
+    if (!result.entries) {
+      throw new Error("The element doesn't have the entries property");
+    }
+
+    verifyEntries(result.entries, lookupKey);
+
+    return result.entries;
+  }
+
+  function addSharedEntries(expectedEntries, sharedEntries, name, indent = "") {
+    log(`${indent}Checking common ${name} entries`);
+
+    indent += "  ";
+
+    for (const sharedEntry of sharedEntries) {
+      const expectedEntry = expectedEntries.find(
+        ({ name: elementName }) => elementName == sharedEntry.name
+      );
+
+      if (expectedEntry) {
+        log(`${indent}Checking common entry ${sharedEntry.name}`);
+
+        if (!expectedEntry.dir || !sharedEntry.dir) {
+          throw new Error("A common entry must be a directory");
+        }
+
+        if (!expectedEntry.entries && !sharedEntry.entries) {
+          throw new Error("A common entry must not be a leaf");
+        }
+
+        if (sharedEntry.entries) {
+          if (!expectedEntry.entries) {
+            expectedEntry.entries = [];
+          }
+
+          addSharedEntries(
+            expectedEntry.entries,
+            sharedEntry.entries,
+            sharedEntry.name,
+            indent
+          );
+        }
+      } else {
+        log(`${indent}Adding entry ${sharedEntry.name}`);
+        expectedEntries.push(sharedEntry);
+      }
+    }
+  }
+
+  function compareEntries(currentEntries, expectedEntries, name, indent = "") {
+    log(`${indent}Comparing ${name} entries`);
+
+    indent += "  ";
+
+    if (currentEntries.length != expectedEntries.length) {
+      throw new Error("Entries must have the same length");
+    }
+
+    for (const currentEntry of currentEntries) {
+      log(`${indent}Comparing entry ${currentEntry.name}`);
+
+      const expectedEntry = expectedEntries.find(
+        ({ name: elementName }) => elementName == currentEntry.name
+      );
+
+      if (!expectedEntry) {
+        throw new Error("Cannot find a matching entry");
+      }
+
+      if (expectedEntry.dir != currentEntry.dir) {
+        throw new Error("The dir property doesn't match");
+      }
+
+      if (
+        (expectedEntry.entries && !currentEntry.entries) ||
+        (!expectedEntry.entries && currentEntry.entries)
+      ) {
+        throw new Error("The entries property doesn't match");
+      }
+
+      if (expectedEntry.entries) {
+        compareEntries(
+          currentEntry.entries,
+          expectedEntry.entries,
+          currentEntry.name,
+          indent
+        );
+      }
+    }
+  }
+
+  const currentEntries = getCurrentEntries();
+
+  log("Stringified current entries: " + JSON.stringify(currentEntries));
+
+  const expectedEntries = getEntriesFromPackageDefinition(
+    packageDefinitionRelativePaths[0],
+    key
+  );
+  const sharedEntries = getEntriesFromPackageDefinition(
+    packageDefinitionRelativePaths[1],
+    sharedKey ? sharedKey : key
+  );
+
+  addSharedEntries(expectedEntries, sharedEntries, key);
+
+  log("Stringified expected entries: " + JSON.stringify(expectedEntries));
+
+  compareEntries(currentEntries, expectedEntries, key);
+}
+
+async function verifyInitializationStatus(
+  expectStorageIsInitialized,
+  expectTemporaryStorageIsInitialized
+) {
+  if (!expectStorageIsInitialized && expectTemporaryStorageIsInitialized) {
+    throw new Error("Invalid expectation");
+  }
+
+  let request = storageInitialized();
+  await requestFinished(request);
+
+  const storageIsInitialized = request.result;
+
+  request = temporaryStorageInitialized();
+  await requestFinished(request);
+
+  const temporaryStorageIsInitialized = request.result;
+
+  ok(
+    !(!storageIsInitialized && temporaryStorageIsInitialized),
+    "Initialization status is consistent"
+  );
+
+  if (expectStorageIsInitialized) {
+    ok(storageIsInitialized, "Storage is initialized");
+  } else {
+    ok(!storageIsInitialized, "Storage is not initialized");
+  }
+
+  if (expectTemporaryStorageIsInitialized) {
+    ok(temporaryStorageIsInitialized, "Temporary storage is initialized");
+  } else {
+    ok(!temporaryStorageIsInitialized, "Temporary storage is not initialized");
+  }
+}
diff --git a/dom/quota/test/xpcshell/common/utils.js b/dom/quota/test/xpcshell/common/utils.js
new file mode 100644
index 0000000000..ee21c90cf2
--- /dev/null
+++ b/dom/quota/test/xpcshell/common/utils.js
@@ -0,0 +1,47 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+function getOriginDir(persistence, origin) {
+  return getRelativeFile(`storage/${persistence}/${origin}`);
+}
+
+function getMetadataFile(persistence, origin) {
+  const metadataFile = getOriginDir(persistence, origin);
+  metadataFile.append(".metadata-v2");
+  return metadataFile;
+}
+
+function populateRepository(persistence) {
+  const originDir = getOriginDir(persistence, "https+++good-example.com");
+  originDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+}
+
+function makeRepositoryUnusable(persistence) {
+  // For the purpose of testing, we make a repository unusable by creating an
+  // origin directory with the metadata file created as a directory (not a
+  // file).
+  const metadataFile = getMetadataFile(persistence, "https+++bad-example.com");
+  metadataFile.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+}
+
+async function fillOrigin(principal, size) {
+  let database = getSimpleDatabase(principal);
+
+  let request = database.open("data");
+  await requestFinished(request);
+
+  try {
+    request = database.write(getBuffer(size));
+    await requestFinished(request);
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  request = database.close();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/createLocalStorage_profile.zip b/dom/quota/test/xpcshell/createLocalStorage_profile.zip
new file mode 100644
index 0000000000..d5958dbd59
--- /dev/null
+++ b/dom/quota/test/xpcshell/createLocalStorage_profile.zip
diff --git a/dom/quota/test/xpcshell/defaultStorageDirectory_shared.json b/dom/quota/test/xpcshell/defaultStorageDirectory_shared.json
new file mode 100644
index 0000000000..6306bac35a
--- /dev/null
+++ b/dom/quota/test/xpcshell/defaultStorageDirectory_shared.json
@@ -0,0 +1,171 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInitTemporaryStorage",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          { "name": "ls-archive.sqlite", "dir": false },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "default",
+            "dir": true,
+            "todo": "Add entry invalid+++example.com once bug 1594075 is fixed",
+            "entries": [{ "name": "foo.bar", "dir": false }]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "todo": "Add entry invalid+++example.com once bug 1594075 is fixed",
+            "entries": [{ "name": "foo.bar", "dir": false }]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterClearPrivateBrowsing",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          { "name": "ls-archive.sqlite", "dir": false },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterClearByOriginPrefix",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          { "name": "ls-archive.sqlite", "dir": false },
+          {
+            "name": "permanent",
+            "dir": true,
+            "todo": "Add entry invalid+++example.com once bug 1594075 is fixed",
+            "entries": [{ "name": "foo.bar", "dir": false }]
+          },
+          {
+            "name": "default",
+            "dir": true,
+            "todo": "Add entry invalid+++example.com once bug 1594075 is fixed",
+            "entries": [{ "name": "foo.bar", "dir": false }]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "todo": "Add entry invalid+++example.com once bug 1594075 is fixed",
+            "entries": [{ "name": "foo.bar", "dir": false }]
+          }
+        ]
+      }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/defaultStorageDirectory_shared.zip b/dom/quota/test/xpcshell/defaultStorageDirectory_shared.zip
new file mode 100644
index 0000000000..61e5b60a87
--- /dev/null
+++ b/dom/quota/test/xpcshell/defaultStorageDirectory_shared.zip
diff --git a/dom/quota/test/xpcshell/getUsage_profile.zip b/dom/quota/test/xpcshell/getUsage_profile.zip
new file mode 100644
index 0000000000..5144112bde
--- /dev/null
+++ b/dom/quota/test/xpcshell/getUsage_profile.zip
diff --git a/dom/quota/test/xpcshell/groupMismatch_profile.zip b/dom/quota/test/xpcshell/groupMismatch_profile.zip
new file mode 100644
index 0000000000..182b013de0
--- /dev/null
+++ b/dom/quota/test/xpcshell/groupMismatch_profile.zip
diff --git a/dom/quota/test/xpcshell/head.js b/dom/quota/test/xpcshell/head.js
new file mode 100644
index 0000000000..bf9ba22ce3
--- /dev/null
+++ b/dom/quota/test/xpcshell/head.js
@@ -0,0 +1,14 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../";
+
+loadScript("dom/quota/test/xpcshell/common/head.js");
+
+function loadScript(path) {
+  let uri = Services.io.newFileURI(do_get_file(depth + path));
+  Services.scriptloader.loadSubScript(uri.spec);
+}
diff --git a/dom/quota/test/xpcshell/indexedDBDirectory_shared.json b/dom/quota/test/xpcshell/indexedDBDirectory_shared.json
new file mode 100644
index 0000000000..6e3d63bafc
--- /dev/null
+++ b/dom/quota/test/xpcshell/indexedDBDirectory_shared.json
@@ -0,0 +1,35 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "indexedDB",
+        "dir": true,
+        "entries": [
+          { "name": "invalid+++example.com", "dir": true },
+          { "name": "foo.bar", "dir": false }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/indexedDBDirectory_shared.zip b/dom/quota/test/xpcshell/indexedDBDirectory_shared.zip
new file mode 100644
index 0000000000..6b959e7525
--- /dev/null
+++ b/dom/quota/test/xpcshell/indexedDBDirectory_shared.zip
diff --git a/dom/quota/test/xpcshell/make_unknownFiles.js b/dom/quota/test/xpcshell/make_unknownFiles.js
new file mode 100644
index 0000000000..b48cbd8ace
--- /dev/null
+++ b/dom/quota/test/xpcshell/make_unknownFiles.js
@@ -0,0 +1,176 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+async function testSteps() {
+  const principal = getPrincipal("http://example.com");
+
+  const repoRelativePath = "storage/default";
+  const originRelativePath = `${repoRelativePath}/http+++example.com`;
+
+  let unknownFileCounter = 1;
+  let unknownDirCounter = 1;
+
+  function createUnknownFileIn(dirRelativePath, recursive) {
+    const dir = getRelativeFile(dirRelativePath);
+
+    let file = dir.clone();
+    file.append("foo" + unknownFileCounter + ".bar");
+
+    const ostream = Cc[
+      "@mozilla.org/network/file-output-stream;1"
+    ].createInstance(Ci.nsIFileOutputStream);
+
+    ostream.init(file, -1, parseInt("0644", 8), 0);
+
+    ostream.write("x".repeat(unknownFileCounter), unknownFileCounter);
+
+    ostream.close();
+
+    unknownFileCounter++;
+
+    if (recursive) {
+      const entries = dir.directoryEntries;
+      while ((file = entries.nextFile)) {
+        if (file.isDirectory()) {
+          createUnknownFileIn(dirRelativePath + "/" + file.leafName);
+        }
+      }
+    }
+  }
+
+  function createUnknownDirectoryIn(dirRelativePath) {
+    createUnknownFileIn(dirRelativePath + "/foo" + unknownDirCounter++);
+  }
+
+  // storage.sqlite and storage/ls-archive.sqlite
+  {
+    const request = init();
+    await requestFinished(request);
+  }
+
+  // Unknown file in the repository
+  {
+    createUnknownFileIn(repoRelativePath);
+  }
+
+  // Unknown file and unknown directory in the origin directory
+  {
+    let request = init();
+    await requestFinished(request);
+
+    request = initTemporaryStorage();
+    await requestFinished(request);
+
+    request = initTemporaryOrigin("default", principal);
+    await requestFinished(request);
+
+    Assert.strictEqual(
+      request.result,
+      true,
+      "The origin directory was created"
+    );
+
+    createUnknownFileIn(originRelativePath);
+    createUnknownDirectoryIn(originRelativePath);
+  }
+
+  // Unknown files in idb client directory and its subdirectories and unknown
+  // directory in .files directory
+  {
+    const request = indexedDB.openForPrincipal(principal, "myIndexedDB");
+    await openDBRequestUpgradeNeeded(request);
+
+    const database = request.result;
+
+    const objectStore = database.createObjectStore("Blobs", {});
+
+    objectStore.add(getNullBlob(200), 42);
+
+    await openDBRequestSucceeded(request);
+
+    database.close();
+
+    createUnknownFileIn(`${originRelativePath}/idb`);
+    createUnknownFileIn(
+      `${originRelativePath}/idb/2320029346mByDIdnedxe.files`
+    );
+    createUnknownDirectoryIn(
+      `${originRelativePath}/idb/2320029346mByDIdnedxe.files`
+    );
+    createUnknownFileIn(
+      `${originRelativePath}/idb/2320029346mByDIdnedxe.files/journals`
+    );
+  }
+
+  // Unknown files in cache client directory and its subdirectories
+  {
+    async function sandboxScript() {
+      const cache = await caches.open("myCache");
+      const request = new Request("http://example.com/index.html");
+      const response = new Response("hello world");
+      await cache.put(request, response);
+    }
+
+    const sandbox = new Cu.Sandbox(principal, {
+      wantGlobalProperties: ["caches", "fetch"],
+    });
+
+    const promise = new Promise(function (resolve, reject) {
+      sandbox.resolve = resolve;
+      sandbox.reject = reject;
+    });
+
+    Cu.evalInSandbox(
+      sandboxScript.toSource() + " sandboxScript().then(resolve, reject);",
+      sandbox
+    );
+    await promise;
+
+    createUnknownFileIn(`${originRelativePath}/cache`);
+    createUnknownFileIn(
+      `${originRelativePath}/cache/morgue`,
+      /* recursive */ true
+    );
+  }
+
+  // Unknown file and unknown directory in sdb client directory
+  {
+    const database = getSimpleDatabase(principal);
+
+    let request = database.open("mySimpleDB");
+    await requestFinished(request);
+
+    request = database.write(getBuffer(100));
+    await requestFinished(request);
+
+    request = database.close();
+    await requestFinished(request);
+
+    createUnknownFileIn(`${originRelativePath}/sdb`);
+    createUnknownDirectoryIn(`${originRelativePath}/sdb`);
+  }
+
+  // Unknown file and unknown directory in ls client directory
+  {
+    Services.prefs.setBoolPref("dom.storage.testing", true);
+    Services.prefs.setBoolPref("dom.storage.client_validation", false);
+
+    const storage = Services.domStorageManager.createStorage(
+      null,
+      principal,
+      principal,
+      ""
+    );
+
+    storage.setItem("foo", "bar");
+
+    storage.close();
+
+    createUnknownFileIn(`${originRelativePath}/ls`);
+    createUnknownDirectoryIn(`${originRelativePath}/ls`);
+  }
+}
diff --git a/dom/quota/test/xpcshell/make_unsetLastAccessTime.js b/dom/quota/test/xpcshell/make_unsetLastAccessTime.js
new file mode 100644
index 0000000000..9be377e4f3
--- /dev/null
+++ b/dom/quota/test/xpcshell/make_unsetLastAccessTime.js
@@ -0,0 +1,25 @@
+/*
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+*/
+
+async function testSteps() {
+  const originDirPath = "storage/default/https+++foo.example.com";
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Creating an empty origin directory");
+
+  let originDir = getRelativeFile(originDirPath);
+  originDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  // The metadata file should be now restored.
+}
diff --git a/dom/quota/test/xpcshell/originMismatch_profile.json b/dom/quota/test/xpcshell/originMismatch_profile.json
new file mode 100644
index 0000000000..cbeaef728a
--- /dev/null
+++ b/dom/quota/test/xpcshell/originMismatch_profile.json
@@ -0,0 +1,77 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.example.com",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata-v2", "dir": false },
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [{ "name": ".padding", "dir": false }]
+                  }
+                ]
+              },
+              { "name": "http+++www.example.com.", "dir": true },
+              {
+                "name": "http+++www.example.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata-v2", "dir": false },
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [{ "name": ".padding", "dir": false }]
+                  }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInitTemporaryStorage",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.example.com.",
+                "dir": true,
+                "entries": [{ "name": ".metadata-v2", "dir": false }]
+              },
+              {
+                "name": "http+++www.example.org.",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata-v2", "dir": false },
+                  { "name": "cache", "dir": true }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/originMismatch_profile.zip b/dom/quota/test/xpcshell/originMismatch_profile.zip
new file mode 100644
index 0000000000..dd5795736f
--- /dev/null
+++ b/dom/quota/test/xpcshell/originMismatch_profile.zip
diff --git a/dom/quota/test/xpcshell/persistentStorageDirectory_shared.json b/dom/quota/test/xpcshell/persistentStorageDirectory_shared.json
new file mode 100644
index 0000000000..8d36293bbf
--- /dev/null
+++ b/dom/quota/test/xpcshell/persistentStorageDirectory_shared.json
@@ -0,0 +1,57 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              { "name": "invalid+++example.com", "dir": true },
+              { "name": "foo.bar", "dir": false }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/persistentStorageDirectory_shared.zip b/dom/quota/test/xpcshell/persistentStorageDirectory_shared.zip
new file mode 100644
index 0000000000..b80bfe904b
--- /dev/null
+++ b/dom/quota/test/xpcshell/persistentStorageDirectory_shared.zip
diff --git a/dom/quota/test/xpcshell/removeLocalStorage1_profile.zip b/dom/quota/test/xpcshell/removeLocalStorage1_profile.zip
new file mode 100644
index 0000000000..19e971433c
--- /dev/null
+++ b/dom/quota/test/xpcshell/removeLocalStorage1_profile.zip
diff --git a/dom/quota/test/xpcshell/removeLocalStorage2_profile.zip b/dom/quota/test/xpcshell/removeLocalStorage2_profile.zip
new file mode 100644
index 0000000000..04d1a3462b
--- /dev/null
+++ b/dom/quota/test/xpcshell/removeLocalStorage2_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/head.js b/dom/quota/test/xpcshell/telemetry/head.js
new file mode 100644
index 0000000000..5c36d82ca6
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/head.js
@@ -0,0 +1,14 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../../";
+
+loadScript("dom/quota/test/xpcshell/common/head.js");
+
+function loadScript(path) {
+  let uri = Services.io.newFileURI(do_get_file(depth + path));
+  Services.scriptloader.loadSubScript(uri.spec);
+}
diff --git a/dom/quota/test/xpcshell/telemetry/test_qm_first_initialization_attempt.js b/dom/quota/test/xpcshell/telemetry/test_qm_first_initialization_attempt.js
new file mode 100644
index 0000000000..9a3afba8c5
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/test_qm_first_initialization_attempt.js
@@ -0,0 +1,866 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+const { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+const storageDirName = "storage";
+const storageFileName = "storage.sqlite";
+const indexedDBDirName = "indexedDB";
+const persistentStorageDirName = "storage/persistent";
+const histogramName = "QM_FIRST_INITIALIZATION_ATTEMPT";
+
+const testcases = [
+  {
+    mainKey: "Storage",
+    async setup(expectedInitResult) {
+      if (!expectedInitResult) {
+        // Make the database unusable by creating it as a directory (not a
+        // file).
+        const storageFile = getRelativeFile(storageFileName);
+        storageFile.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "TemporaryStorage",
+    async setup(expectedInitResult) {
+      // We need to initialize storage before populating the repositories. If
+      // we don't do that, the storage directory created for the repositories
+      // would trigger storage upgrades (from version 0 to current version).
+      let request = init();
+      await requestFinished(request);
+
+      populateRepository("temporary");
+      populateRepository("default");
+
+      if (!expectedInitResult) {
+        makeRepositoryUnusable("temporary");
+        makeRepositoryUnusable("default");
+      }
+    },
+    initFunction: initTemporaryStorage,
+    getExpectedSnapshots() {
+      const expectedSnapshotsInNightly = {
+        initFailure: {
+          Storage: {
+            values: [0, 1, 0],
+          },
+          TemporaryRepository: {
+            values: [1, 0],
+          },
+          DefaultRepository: {
+            values: [1, 0],
+          },
+          // mainKey
+          TemporaryStorage: {
+            values: [1, 0],
+          },
+        },
+        initFailureThenSuccess: {
+          Storage: {
+            values: [0, 2, 0],
+          },
+          TemporaryRepository: {
+            values: [1, 1, 0],
+          },
+          DefaultRepository: {
+            values: [1, 1, 0],
+          },
+          // mainKey
+          TemporaryStorage: {
+            values: [1, 1, 0],
+          },
+        },
+      };
+
+      const expectedSnapshotsInOthers = {
+        initFailure: {
+          Storage: {
+            values: [0, 1, 0],
+          },
+          TemporaryRepository: {
+            values: [1, 0],
+          },
+          // mainKey
+          TemporaryStorage: {
+            values: [1, 0],
+          },
+        },
+        initFailureThenSuccess: {
+          Storage: {
+            values: [0, 2, 0],
+          },
+          TemporaryRepository: {
+            values: [1, 1, 0],
+          },
+          DefaultRepository: {
+            values: [0, 1, 0],
+          },
+          // mainKey
+          TemporaryStorage: {
+            values: [1, 1, 0],
+          },
+        },
+      };
+
+      return AppConstants.NIGHTLY_BUILD
+        ? expectedSnapshotsInNightly
+        : expectedSnapshotsInOthers;
+    },
+  },
+  {
+    mainKey: "DefaultRepository",
+    async setup(expectedInitResult) {
+      // See the comment for "TemporaryStorage".
+      let request = init();
+      await requestFinished(request);
+
+      populateRepository("default");
+
+      if (!expectedInitResult) {
+        makeRepositoryUnusable("default");
+      }
+    },
+    initFunction: initTemporaryStorage,
+    expectedSnapshots: {
+      initFailure: {
+        Storage: {
+          values: [0, 1, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 1, 0],
+        },
+        // mainKey
+        DefaultRepository: {
+          values: [1, 0],
+        },
+        TemporaryStorage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        Storage: {
+          values: [0, 2, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 2, 0],
+        },
+        // mainKey
+        DefaultRepository: {
+          values: [1, 1, 0],
+        },
+        TemporaryStorage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "TemporaryRepository",
+    async setup(expectedInitResult) {
+      // See the comment for "TemporaryStorage".
+      let request = init();
+      await requestFinished(request);
+
+      populateRepository("temporary");
+
+      if (!expectedInitResult) {
+        makeRepositoryUnusable("temporary");
+      }
+    },
+    initFunction: initTemporaryStorage,
+    getExpectedSnapshots() {
+      const expectedSnapshotsInNightly = {
+        initFailure: {
+          Storage: {
+            values: [0, 1, 0],
+          },
+          // mainKey
+          TemporaryRepository: {
+            values: [1, 0],
+          },
+          DefaultRepository: {
+            values: [0, 1, 0],
+          },
+          TemporaryStorage: {
+            values: [1, 0],
+          },
+        },
+        initFailureThenSuccess: {
+          Storage: {
+            values: [0, 2, 0],
+          },
+          // mainKey
+          TemporaryRepository: {
+            values: [1, 1, 0],
+          },
+          DefaultRepository: {
+            values: [0, 2, 0],
+          },
+          TemporaryStorage: {
+            values: [1, 1, 0],
+          },
+        },
+      };
+
+      const expectedSnapshotsInOthers = {
+        initFailure: {
+          Storage: {
+            values: [0, 1, 0],
+          },
+          // mainKey
+          TemporaryRepository: {
+            values: [1, 0],
+          },
+          TemporaryStorage: {
+            values: [1, 0],
+          },
+        },
+        initFailureThenSuccess: {
+          Storage: {
+            values: [0, 2, 0],
+          },
+          // mainKey
+          TemporaryRepository: {
+            values: [1, 1, 0],
+          },
+          DefaultRepository: {
+            values: [0, 1, 0],
+          },
+          TemporaryStorage: {
+            values: [1, 1, 0],
+          },
+        },
+      };
+
+      return AppConstants.NIGHTLY_BUILD
+        ? expectedSnapshotsInNightly
+        : expectedSnapshotsInOthers;
+    },
+  },
+  {
+    mainKey: "UpgradeStorageFrom0_0To1_0",
+    async setup(expectedInitResult) {
+      // storage used prior FF 49 (storage version 0.0)
+      installPackage("version0_0_profile");
+
+      if (!expectedInitResult) {
+        installPackage("version0_0_make_it_unusable");
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeStorageFrom0_0To1_0: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeStorageFrom0_0To1_0: {
+          values: [1, 1, 0],
+        },
+        UpgradeStorageFrom1_0To2_0: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_0To2_1: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_1To2_2: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeStorageFrom1_0To2_0",
+    async setup(expectedInitResult) {
+      // storage used by FF 49-54 (storage version 1.0)
+      installPackage("version1_0_profile");
+
+      if (!expectedInitResult) {
+        installPackage("version1_0_make_it_unusable");
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeStorageFrom1_0To2_0: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeStorageFrom1_0To2_0: {
+          values: [1, 1, 0],
+        },
+        UpgradeStorageFrom2_0To2_1: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_1To2_2: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeStorageFrom2_0To2_1",
+    async setup(expectedInitResult) {
+      // storage used by FF 55-56 (storage version 2.0)
+      installPackage("version2_0_profile");
+
+      if (!expectedInitResult) {
+        installPackage("version2_0_make_it_unusable");
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeStorageFrom2_0To2_1: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeStorageFrom2_0To2_1: {
+          values: [1, 1, 0],
+        },
+        UpgradeStorageFrom2_1To2_2: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeStorageFrom2_1To2_2",
+    async setup(expectedInitResult) {
+      // storage used by FF 57-67 (storage version 2.1)
+      installPackage("version2_1_profile");
+
+      if (!expectedInitResult) {
+        installPackage("version2_1_make_it_unusable");
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeStorageFrom2_1To2_2: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeStorageFrom2_1To2_2: {
+          values: [1, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeStorageFrom2_2To2_3",
+    async setup(expectedInitResult) {
+      // storage used by FF 68-69 (storage version 2.2)
+      installPackage("version2_2_profile");
+
+      if (!expectedInitResult) {
+        installPackage(
+          "version2_2_make_it_unusable",
+          /* allowFileOverwrites */ true
+        );
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeStorageFrom2_2To2_3: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeStorageFrom2_2To2_3: {
+          values: [1, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeFromIndexedDBDirectory",
+    async setup(expectedInitResult) {
+      const indexedDBDir = getRelativeFile(indexedDBDirName);
+      indexedDBDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+
+      if (!expectedInitResult) {
+        // "indexedDB" directory will be moved under "storage" directory and at
+        // the same time renamed to "persistent". Create a storage file to cause
+        // the moves to fail.
+        const storageFile = getRelativeFile(storageDirName);
+        storageFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o666);
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeFromIndexedDBDirectory: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeFromIndexedDBDirectory: {
+          values: [1, 1, 0],
+        },
+        UpgradeFromPersistentStorageDirectory: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom0_0To1_0: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom1_0To2_0: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_0To2_1: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_1To2_2: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "UpgradeFromPersistentStorageDirectory",
+    async setup(expectedInitResult) {
+      const persistentStorageDir = getRelativeFile(persistentStorageDirName);
+      persistentStorageDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+
+      if (!expectedInitResult) {
+        // Create a metadata directory to break creating or upgrading directory
+        // metadata files.
+        const metadataDir = getRelativeFile(
+          "storage/persistent/https+++bad.example.com/.metadata"
+        );
+        metadataDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+      }
+    },
+    initFunction: init,
+    expectedSnapshots: {
+      initFailure: {
+        // mainKey
+        UpgradeFromPersistentStorageDirectory: {
+          values: [1, 0],
+        },
+        Storage: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        // mainKey
+        UpgradeFromPersistentStorageDirectory: {
+          values: [1, 1, 0],
+        },
+        UpgradeStorageFrom0_0To1_0: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom1_0To2_0: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_0To2_1: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_1To2_2: {
+          values: [0, 1, 0],
+        },
+        UpgradeStorageFrom2_2To2_3: {
+          values: [0, 1, 0],
+        },
+        Storage: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "PersistentOrigin",
+    async setup(expectedInitResult) {
+      // We need to initialize storage before creating the origin files. If we
+      // don't do that, the storage directory created for the origin files
+      // would trigger storage upgrades (from version 0 to current version).
+      let request = init();
+      await requestFinished(request);
+
+      if (!expectedInitResult) {
+        const originFiles = [
+          getRelativeFile("storage/permanent/https+++example.com"),
+          getRelativeFile("storage/permanent/https+++example1.com"),
+          getRelativeFile("storage/default/https+++example2.com"),
+        ];
+
+        for (const originFile of originFiles) {
+          originFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o666);
+        }
+      }
+
+      request = initTemporaryStorage();
+      await requestFinished(request);
+    },
+    initFunctions: [
+      {
+        name: initPersistentOrigin,
+        args: [getPrincipal("https://example.com")],
+      },
+      {
+        name: initPersistentOrigin,
+        args: [getPrincipal("https://example1.com")],
+      },
+      {
+        name: initTemporaryOrigin,
+        args: ["default", getPrincipal("https://example2.com")],
+      },
+    ],
+    expectedSnapshots: {
+      initFailure: {
+        Storage: {
+          values: [0, 1, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 1, 0],
+        },
+        DefaultRepository: {
+          values: [0, 1, 0],
+        },
+        TemporaryStorage: {
+          values: [0, 1, 0],
+        },
+        // mainKey
+        PersistentOrigin: {
+          values: [2, 0],
+        },
+        TemporaryOrigin: {
+          values: [1, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        Storage: {
+          values: [0, 2, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 2, 0],
+        },
+        DefaultRepository: {
+          values: [0, 2, 0],
+        },
+        TemporaryStorage: {
+          values: [0, 2, 0],
+        },
+        // mainKey
+        PersistentOrigin: {
+          values: [2, 2, 0],
+        },
+        TemporaryOrigin: {
+          values: [1, 1, 0],
+        },
+      },
+    },
+  },
+  {
+    mainKey: "TemporaryOrigin",
+    async setup(expectedInitResult) {
+      // See the comment for "PersistentOrigin".
+      let request = init();
+      await requestFinished(request);
+
+      if (!expectedInitResult) {
+        const originFiles = [
+          getRelativeFile("storage/temporary/https+++example.com"),
+          getRelativeFile("storage/default/https+++example.com"),
+          getRelativeFile("storage/default/https+++example1.com"),
+          getRelativeFile("storage/permanent/https+++example2.com"),
+        ];
+
+        for (const originFile of originFiles) {
+          originFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o666);
+        }
+      }
+
+      request = initTemporaryStorage();
+      await requestFinished(request);
+    },
+    initFunctions: [
+      {
+        name: initTemporaryOrigin,
+        args: ["temporary", getPrincipal("https://example.com")],
+      },
+      {
+        name: initTemporaryOrigin,
+        args: ["default", getPrincipal("https://example.com")],
+      },
+      {
+        name: initTemporaryOrigin,
+        args: ["default", getPrincipal("https://example1.com")],
+      },
+      {
+        name: initPersistentOrigin,
+        args: [getPrincipal("https://example2.com")],
+      },
+    ],
+    // Only the first result of EnsureTemporaryOriginIsInitialized per origin
+    // should be reported. Thus, only the results for (temporary, example.com),
+    // and (default, example1.com) should be reported.
+    expectedSnapshots: {
+      initFailure: {
+        Storage: {
+          values: [0, 1, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 1, 0],
+        },
+        DefaultRepository: {
+          values: [0, 1, 0],
+        },
+        TemporaryStorage: {
+          values: [0, 1, 0],
+        },
+        PersistentOrigin: {
+          values: [1, 0],
+        },
+        // mainKey
+        TemporaryOrigin: {
+          values: [2, 0],
+        },
+      },
+      initFailureThenSuccess: {
+        Storage: {
+          values: [0, 2, 0],
+        },
+        TemporaryRepository: {
+          values: [0, 2, 0],
+        },
+        DefaultRepository: {
+          values: [0, 2, 0],
+        },
+        TemporaryStorage: {
+          values: [0, 2, 0],
+        },
+        PersistentOrigin: {
+          values: [1, 1, 0],
+        },
+        // mainKey
+        TemporaryOrigin: {
+          values: [2, 2, 0],
+        },
+      },
+    },
+  },
+];
+
+loadScript("dom/quota/test/xpcshell/common/utils.js");
+
+function verifyHistogram(histogram, mainKey, expectedSnapshot) {
+  const snapshot = histogram.snapshot();
+
+  ok(
+    mainKey in snapshot,
+    `The histogram ${histogram.name()} must contain the main key ${mainKey}`
+  );
+
+  const keys = Object.keys(snapshot);
+
+  is(
+    keys.length,
+    Object.keys(expectedSnapshot).length,
+    `The number of keys must match the expected number of keys for ` +
+      `${histogram.name()}`
+  );
+
+  for (const key of keys) {
+    ok(
+      key in expectedSnapshot,
+      `The key ${key} must match the expected keys for ${histogram.name()}`
+    );
+
+    const values = Object.entries(snapshot[key].values);
+    const expectedValues = expectedSnapshot[key].values;
+
+    is(
+      values.length,
+      expectedValues.length,
+      `The number of values should match the expected number of values for ` +
+        `${histogram.name()}`
+    );
+
+    for (let [i, val] of values) {
+      is(
+        val,
+        expectedValues[i],
+        `Expected counts should match for ${histogram.name()} at index ${i}`
+      );
+    }
+  }
+}
+
+async function testSteps() {
+  let request;
+  for (const testcase of testcases) {
+    const mainKey = testcase.mainKey;
+
+    info(`Verifying ${histogramName} histogram for the main key ${mainKey}`);
+
+    const histogram =
+      TelemetryTestUtils.getAndClearKeyedHistogram(histogramName);
+
+    for (const expectedInitResult of [false, true]) {
+      info(
+        `Verifying the histogram when the initialization ` +
+          `${expectedInitResult ? "failed and then succeeds" : "fails"}`
+      );
+
+      await testcase.setup(expectedInitResult);
+
+      const msg = `Should ${expectedInitResult ? "not " : ""} have thrown`;
+
+      // Call the initialization function twice, so we can verify below that
+      // only the first initialization attempt has been reported.
+      for (let i = 0; i < 2; ++i) {
+        let initFunctions;
+
+        if (testcase.initFunctions) {
+          initFunctions = testcase.initFunctions;
+        } else {
+          initFunctions = [
+            {
+              name: testcase.initFunction,
+              args: [],
+            },
+          ];
+        }
+
+        for (const initFunction of initFunctions) {
+          request = initFunction.name(...initFunction.args);
+          try {
+            await requestFinished(request);
+            ok(expectedInitResult, msg);
+          } catch (ex) {
+            ok(!expectedInitResult, msg);
+          }
+        }
+      }
+
+      const expectedSnapshots = testcase.getExpectedSnapshots
+        ? testcase.getExpectedSnapshots()
+        : testcase.expectedSnapshots;
+
+      const expectedSnapshot = expectedInitResult
+        ? expectedSnapshots.initFailureThenSuccess
+        : expectedSnapshots.initFailure;
+
+      verifyHistogram(histogram, mainKey, expectedSnapshot);
+
+      // The first initialization attempt has been reported in the histogram
+      // and any new attemps wouldn't be reported if we didn't reset or clear
+      // the storage here. We need a clean profile for the next iteration
+      // anyway.
+      // However, the clear storage operation needs initialized storage, so
+      // clearing can fail if the storage is unusable and it can also increase
+      // some of the telemetry counters. Instead of calling clear, we can just
+      // call reset and clear profile manually.
+      request = reset();
+      await requestFinished(request);
+
+      const indexedDBDir = getRelativeFile(indexedDBDirName);
+      if (indexedDBDir.exists()) {
+        indexedDBDir.remove(false);
+      }
+
+      const storageDir = getRelativeFile(storageDirName);
+      if (storageDir.exists()) {
+        storageDir.remove(true);
+      }
+
+      const storageFile = getRelativeFile(storageFileName);
+      if (storageFile.exists()) {
+        // It could be a non empty directory, so remove it recursively.
+        storageFile.remove(true);
+      }
+    }
+  }
+}
diff --git a/dom/quota/test/xpcshell/telemetry/version0_0_make_it_unusable.zip b/dom/quota/test/xpcshell/telemetry/version0_0_make_it_unusable.zip
new file mode 100644
index 0000000000..92dcfb777e
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version0_0_make_it_unusable.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version0_0_profile.zip b/dom/quota/test/xpcshell/telemetry/version0_0_profile.zip
new file mode 100644
index 0000000000..2fb0f525c2
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version0_0_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version1_0_make_it_unusable.zip b/dom/quota/test/xpcshell/telemetry/version1_0_make_it_unusable.zip
new file mode 100644
index 0000000000..92dcfb777e
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version1_0_make_it_unusable.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version1_0_profile.zip b/dom/quota/test/xpcshell/telemetry/version1_0_profile.zip
new file mode 100644
index 0000000000..6169f439c1
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version1_0_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_0_make_it_unusable.zip b/dom/quota/test/xpcshell/telemetry/version2_0_make_it_unusable.zip
new file mode 100644
index 0000000000..92dcfb777e
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_0_make_it_unusable.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_0_profile.zip b/dom/quota/test/xpcshell/telemetry/version2_0_profile.zip
new file mode 100644
index 0000000000..465f53cea9
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_0_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_1_make_it_unusable.zip b/dom/quota/test/xpcshell/telemetry/version2_1_make_it_unusable.zip
new file mode 100644
index 0000000000..92dcfb777e
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_1_make_it_unusable.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_1_profile.zip b/dom/quota/test/xpcshell/telemetry/version2_1_profile.zip
new file mode 100644
index 0000000000..81463235ab
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_1_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_2_make_it_unusable.zip b/dom/quota/test/xpcshell/telemetry/version2_2_make_it_unusable.zip
new file mode 100644
index 0000000000..b6b8eecabf
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_2_make_it_unusable.zip
diff --git a/dom/quota/test/xpcshell/telemetry/version2_2_profile.zip b/dom/quota/test/xpcshell/telemetry/version2_2_profile.zip
new file mode 100644
index 0000000000..e572726cca
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/version2_2_profile.zip
diff --git a/dom/quota/test/xpcshell/telemetry/xpcshell.toml b/dom/quota/test/xpcshell/telemetry/xpcshell.toml
new file mode 100644
index 0000000000..949ef3cb06
--- /dev/null
+++ b/dom/quota/test/xpcshell/telemetry/xpcshell.toml
@@ -0,0 +1,17 @@
+[DEFAULT]
+head = "head.js"
+support-files = [
+  "version0_0_make_it_unusable.zip",
+  "version0_0_profile.zip",
+  "version1_0_make_it_unusable.zip",
+  "version1_0_profile.zip",
+  "version2_0_make_it_unusable.zip",
+  "version2_0_profile.zip",
+  "version2_1_make_it_unusable.zip",
+  "version2_1_profile.zip",
+  "version2_2_make_it_unusable.zip",
+  "version2_2_profile.zip",
+]
+
+["test_qm_first_initialization_attempt.js"]
+skip-if = ["appname == 'thunderbird'"]
diff --git a/dom/quota/test/xpcshell/tempMetadataCleanup_profile.zip b/dom/quota/test/xpcshell/tempMetadataCleanup_profile.zip
new file mode 100644
index 0000000000..da1de0979b
--- /dev/null
+++ b/dom/quota/test/xpcshell/tempMetadataCleanup_profile.zip
diff --git a/dom/quota/test/xpcshell/test_allowListFiles.js b/dom/quota/test/xpcshell/test_allowListFiles.js
new file mode 100644
index 0000000000..04c64c2ef5
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_allowListFiles.js
@@ -0,0 +1,61 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify thoes unexpected files are in the allow list of
+ * QuotaManager. They aren't expected in the repository but if there are,
+ * QuotaManager shouldn't fail to initialize an origin and getting usage, though
+ * those files aren't managed by QuotaManager.
+ */
+
+async function testSteps() {
+  const allowListFiles = [
+    ".dot-file",
+    "desktop.ini",
+    "Desktop.ini",
+    "Thumbs.db",
+    "thumbs.db",
+  ];
+
+  for (let allowListFile of allowListFiles) {
+    info("Testing " + allowListFile + " in the repository");
+
+    info("Initializing");
+
+    let request = init();
+    await requestFinished(request);
+
+    info("Creating unknown files");
+
+    for (let dir of ["persistenceType dir", "origin dir"]) {
+      let dirPath =
+        dir == "persistenceType dir"
+          ? "storage/default/"
+          : "storage/default/http+++example.com/";
+      let file = getRelativeFile(dirPath + allowListFile);
+      file.create(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("0644", 8));
+    }
+
+    info("Initializing temporary storage");
+
+    request = initTemporaryStorage();
+    await requestFinished(request);
+
+    info("Resetting");
+
+    request = reset();
+    await requestFinished(request);
+
+    info("Getting usage");
+
+    request = getCurrentUsage(continueToNextStepSync);
+    await requestFinished(request);
+
+    info("Clearing");
+
+    request = clear();
+    await requestFinished(request);
+  }
+}
diff --git a/dom/quota/test/xpcshell/test_bad_origin_directory.js b/dom/quota/test/xpcshell/test_bad_origin_directory.js
new file mode 100644
index 0000000000..303fd82bd8
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_bad_origin_directory.js
@@ -0,0 +1,37 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const invalidOrigin = {
+    url: "ws://ws.invalid.origin",
+    path: "storage/default/ws+++ws.invalid.origin",
+  };
+
+  info("Persisting an invalid origin");
+
+  let invalidPrincipal = getPrincipal(invalidOrigin.url);
+
+  let request = persist(invalidPrincipal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(
+    request.resultCode,
+    NS_ERROR_FAILURE,
+    "Persist() failed because of the invalid origin"
+  );
+  Assert.strictEqual(request.result, null, "The request result is null");
+
+  let originDir = getRelativeFile(invalidOrigin.path);
+  let exists = originDir.exists();
+  ok(!exists, "Directory for invalid origin doesn't exist");
+
+  request = persisted(invalidPrincipal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persisted() succeeded");
+  ok(!request.result, "The origin isn't persisted since the operation failed");
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_basics.js b/dom/quota/test/xpcshell/test_basics.js
new file mode 100644
index 0000000000..efe5aa7926
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_basics.js
@@ -0,0 +1,143 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const storageFile = "storage.sqlite";
+
+  const metadataFiles = [
+    {
+      path: "storage/permanent/chrome/.metadata",
+      shouldExistAfterInit: false,
+    },
+
+    {
+      path: "storage/permanent/chrome/.metadata-tmp",
+      shouldExistAfterInit: false,
+    },
+
+    {
+      path: "storage/permanent/chrome/.metadata-v2",
+      shouldExistAfterInit: true,
+    },
+
+    {
+      path: "storage/permanent/chrome/.metadata-v2-tmp",
+      shouldExistAfterInit: false,
+    },
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(false, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Getting usage");
+
+  getCurrentUsage(grabUsageAndContinueHandler);
+  let usage = yield undefined;
+
+  Assert.equal(usage, 0, "Usage is zero");
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(true, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(false, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Installing package");
+
+  // The profile contains just one empty IndexedDB database. The file
+  // create_db.js in the package was run locally, specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  // mach xpcshell-test --interactive dom/quota/test/xpcshell/create_db.js
+  installPackage("basics_profile");
+
+  info("Getting usage");
+
+  getCurrentUsage(grabUsageAndContinueHandler);
+  usage = yield undefined;
+
+  Assert.greater(usage, 0, "Usage is not zero");
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(true, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Checking storage file");
+
+  let file = getRelativeFile(storageFile);
+
+  let exists = file.exists();
+  ok(!exists, "Storage file doesn't exist");
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(false, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Initializing");
+
+  request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  exists = file.exists();
+  ok(exists, "Storage file does exist");
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(true, false).then(continueToNextStepSync);
+  yield undefined;
+
+  info("Initializing origin");
+
+  request = initPersistentOrigin(getCurrentPrincipal(), continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  ok(request.result, "Origin directory was created");
+
+  for (let metadataFile of metadataFiles) {
+    file = getRelativeFile(metadataFile.path);
+
+    exists = file.exists();
+
+    if (metadataFile.shouldExistAfterInit) {
+      ok(exists, "Metadata file does exist");
+    } else {
+      ok(!exists, "Metadata file doesn't exist");
+    }
+  }
+
+  info("Verifying initialization status");
+
+  verifyInitializationStatus(true, false).then(continueToNextStepSync);
+
+  yield undefined;
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_clearStoragesForOriginAttributesPattern.js b/dom/quota/test/xpcshell/test_clearStoragesForOriginAttributesPattern.js
new file mode 100644
index 0000000000..096cf2be70
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_clearStoragesForOriginAttributesPattern.js
@@ -0,0 +1,58 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const baseRelativePath = "storage/default";
+  const userContextForRemoval = 2;
+
+  const origins = [
+    {
+      userContextId: 1,
+      baseDirName: "https+++example.com",
+    },
+
+    {
+      userContextId: userContextForRemoval,
+      baseDirName: "https+++example.com",
+    },
+
+    // TODO: Uncomment this once bug 1638831 is fixed.
+    /*
+    {
+      userContextId: userContextForRemoval,
+      baseDirName: "https+++example.org",
+    },
+    */
+  ];
+
+  function getOriginDirectory(origin) {
+    return getRelativeFile(
+      `${baseRelativePath}/${origin.baseDirName}^userContextId=` +
+        `${origin.userContextId}`
+    );
+  }
+
+  let request = init();
+  await requestFinished(request);
+
+  for (const origin of origins) {
+    const directory = getOriginDirectory(origin);
+    directory.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+  }
+
+  request = Services.qms.clearStoragesForOriginAttributesPattern(
+    `{ "userContextId": ${userContextForRemoval} }`
+  );
+  await requestFinished(request);
+
+  for (const origin of origins) {
+    const directory = getOriginDirectory(origin);
+    if (origin.userContextId === userContextForRemoval) {
+      ok(!directory.exists(), "Origin directory should have been removed");
+    } else {
+      ok(directory.exists(), "Origin directory shouldn't have been removed");
+    }
+  }
+}
diff --git a/dom/quota/test/xpcshell/test_clearStoragesForOriginPrefix.js b/dom/quota/test/xpcshell/test_clearStoragesForOriginPrefix.js
new file mode 100644
index 0000000000..161dd9722c
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_clearStoragesForOriginPrefix.js
@@ -0,0 +1,72 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify clearing by origin prefix.
+ */
+
+async function testSteps() {
+  const packages = [
+    "clearStoragesForOriginPrefix_profile",
+    "defaultStorageDirectory_shared",
+  ];
+
+  const testData = [
+    {
+      origin: "http://example.com",
+      persistence: null,
+      key: "afterClearByOriginPrefix",
+    },
+    {
+      origin: "http://example.com",
+      persistence: "default",
+      key: "afterClearByOriginPrefix_default",
+    },
+    {
+      origin: "http://example.com",
+      persistence: "persistent",
+      key: "afterClearByOriginPrefix_persistent",
+    },
+    {
+      origin: "http://example.com",
+      persistence: "temporary",
+      key: "afterClearByOriginPrefix_temporary",
+    },
+  ];
+
+  for (const item of testData) {
+    info("Clearing");
+
+    let request = clear();
+    await requestFinished(request);
+
+    info("Verifying storage");
+
+    verifyStorage(packages, "beforeInstall");
+
+    info("Installing package");
+
+    installPackages(packages);
+
+    info("Verifying storage");
+
+    verifyStorage(packages, "afterInstall");
+
+    // TODO: Remove this block once origin clearing is able to ignore unknown
+    //       directories.
+    getRelativeFile("storage/default/invalid+++example.com").remove(false);
+    getRelativeFile("storage/permanent/invalid+++example.com").remove(false);
+    getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+    info("Clearing origin by prefix");
+
+    request = clearOriginsByPrefix(getPrincipal(item.origin), item.persistence);
+    await requestFinished(request);
+
+    info("Verifying storage");
+
+    verifyStorage(packages, item.key, "afterClearByOriginPrefix");
+  }
+}
diff --git a/dom/quota/test/xpcshell/test_clearStoragesForPrincipal.js b/dom/quota/test/xpcshell/test_clearStoragesForPrincipal.js
new file mode 100644
index 0000000000..1e8bed54b7
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_clearStoragesForPrincipal.js
@@ -0,0 +1,56 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is an xpcshell test for clearStoragesForPrincipal. It verifies that
+ * if the removing client is the last client in the targeting origin, then it
+ * is expected to remove the origin directory as well.
+ */
+
+async function testSteps() {
+  const testingOrigins = [
+    {
+      origin: "http://example.com",
+      path: "storage/default/http+++example.com/",
+      only_idb: false,
+    },
+    {
+      origin: "http://www.mozilla.org",
+      path: "storage/default/http+++www.mozilla.org/",
+      only_idb: true,
+    },
+  ];
+  const removingClient = "idb";
+
+  info("Installing package to create the environment");
+  // The package is manually created and it contains:
+  // - storage/default/http+++www.mozilla.org/idb/
+  // - storage/default/http+++www.example.com/idb/
+  // - storage/default/http+++www.example.com/cache/
+  installPackage("clearStoragesForPrincipal_profile");
+
+  let request;
+  let file;
+  for (let i = 0; i < testingOrigins.length; ++i) {
+    info("Clearing");
+    request = clearClient(
+      getPrincipal(testingOrigins[i].origin),
+      null,
+      removingClient
+    );
+    await requestFinished(request);
+
+    info("Verifying");
+    file = getRelativeFile(testingOrigins[i].path + removingClient);
+    ok(!file.exists(), "Client file doesn't exist");
+
+    file = getRelativeFile(testingOrigins[i].path);
+    if (testingOrigins[i].only_idb) {
+      todo(!file.exists(), "Origin file doesn't exist");
+    } else {
+      ok(file.exists(), "Origin file does exist");
+    }
+  }
+}
diff --git a/dom/quota/test/xpcshell/test_clearStoragesForPrivateBrowsing.js b/dom/quota/test/xpcshell/test_clearStoragesForPrivateBrowsing.js
new file mode 100644
index 0000000000..6a94e5c98e
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_clearStoragesForPrivateBrowsing.js
@@ -0,0 +1,41 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify clearing of storages for private browsing.
+ */
+
+async function testSteps() {
+  const packages = [
+    "clearStoragesForPrivateBrowsing_profile",
+    "defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing package");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Clearing private browsing");
+
+  request = clearPrivateBrowsing();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterClearPrivateBrowsing");
+}
diff --git a/dom/quota/test/xpcshell/test_createLocalStorage.js b/dom/quota/test/xpcshell/test_createLocalStorage.js
new file mode 100644
index 0000000000..8394a7d235
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_createLocalStorage.js
@@ -0,0 +1,155 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const webAppsStoreFile = "webappsstore.sqlite";
+  const lsArchiveFile = "storage/ls-archive.sqlite";
+  const lsArchiveTmpFile = "storage/ls-archive-tmp.sqlite";
+
+  function checkArchiveFileNotExists() {
+    info("Checking archive tmp file");
+
+    let archiveTmpFile = getRelativeFile(lsArchiveTmpFile);
+
+    let exists = archiveTmpFile.exists();
+    ok(!exists, "archive tmp file doesn't exist");
+
+    info("Checking archive file");
+
+    let archiveFile = getRelativeFile(lsArchiveFile);
+
+    exists = archiveFile.exists();
+    ok(!exists, "archive file doesn't exist");
+  }
+
+  function checkArchiveFileExists() {
+    info("Checking archive tmp file");
+
+    let archiveTmpFile = getRelativeFile(lsArchiveTmpFile);
+
+    let exists = archiveTmpFile.exists();
+    ok(!exists, "archive tmp file doesn't exist");
+
+    info("Checking archive file");
+
+    let archiveFile = getRelativeFile(lsArchiveFile);
+
+    exists = archiveFile.exists();
+    ok(exists, "archive file does exist");
+
+    info("Checking archive file size");
+
+    let fileSize = archiveFile.fileSize;
+    Assert.greater(fileSize, 0, "archive file size is greater than zero");
+  }
+
+  // Profile 1 - Nonexistent apps store file.
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  let appsStoreFile = getRelativeFile(webAppsStoreFile);
+
+  let exists = appsStoreFile.exists();
+  ok(!exists, "apps store file doesn't exist");
+
+  checkArchiveFileNotExists();
+
+  try {
+    request = init();
+    await requestFinished(request);
+
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  checkArchiveFileExists();
+
+  // Profile 2 - apps store file is a directory.
+  info("Clearing");
+
+  request = clear();
+  await requestFinished(request);
+
+  appsStoreFile.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+
+  checkArchiveFileNotExists();
+
+  try {
+    request = init();
+    await requestFinished(request);
+
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  checkArchiveFileExists();
+
+  appsStoreFile.remove(true);
+
+  // Profile 3 - Corrupted apps store file.
+  info("Clearing");
+
+  request = clear();
+  await requestFinished(request);
+
+  let ostream = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(
+    Ci.nsIFileOutputStream
+  );
+  ostream.init(appsStoreFile, -1, parseInt("0644", 8), 0);
+  ostream.write("foobar", 6);
+  ostream.close();
+
+  checkArchiveFileNotExists();
+
+  try {
+    request = init();
+    await requestFinished(request);
+
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  checkArchiveFileExists();
+
+  appsStoreFile.remove(false);
+
+  // Profile 4 - Nonupdateable apps store file.
+  info("Clearing");
+
+  request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains storage.sqlite and webappsstore.sqlite
+  // webappstore.sqlite was taken from FF 54 to force an upgrade.
+  // There's just one record in the webappsstore2 table. The record was
+  // modified by renaming the origin attribute userContextId to userContextKey.
+  // This triggers an error during the upgrade.
+  installPackage("createLocalStorage_profile");
+
+  let fileSize = appsStoreFile.fileSize;
+  Assert.greater(fileSize, 0, "apps store file size is greater than zero");
+
+  checkArchiveFileNotExists();
+
+  try {
+    request = init();
+    await requestFinished(request);
+
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  checkArchiveFileExists();
+
+  appsStoreFile.remove(false);
+}
diff --git a/dom/quota/test/xpcshell/test_estimateOrigin.js b/dom/quota/test/xpcshell/test_estimateOrigin.js
new file mode 100644
index 0000000000..31d6f01686
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_estimateOrigin.js
@@ -0,0 +1,80 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/xpcshell/common/utils.js");
+
+async function verifyOriginEstimation(principal, expectedUsage, expectedLimit) {
+  info("Estimating origin");
+
+  const request = estimateOrigin(principal);
+  await requestFinished(request);
+
+  is(request.result.usage, expectedUsage, "Correct usage");
+  is(request.result.limit, expectedLimit, "Correct limit");
+}
+
+async function testSteps() {
+  // The group limit is calculated as 20% of the global limit and the minimum
+  // value of the group limit is 10 MB.
+
+  const groupLimitKB = 10 * 1024;
+  const groupLimitBytes = groupLimitKB * 1024;
+  const globalLimitKB = groupLimitKB * 5;
+  const globalLimitBytes = globalLimitKB * 1024;
+
+  info("Setting limits");
+
+  setGlobalLimit(globalLimitKB);
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Filling origins");
+
+  await fillOrigin(getPrincipal("https://foo1.example1.com"), 100);
+  await fillOrigin(getPrincipal("https://foo2.example1.com"), 200);
+  await fillOrigin(getPrincipal("https://foo1.example2.com"), 300);
+  await fillOrigin(getPrincipal("https://foo2.example2.com"), 400);
+
+  info("Verifying origin estimations");
+
+  await verifyOriginEstimation(
+    getPrincipal("https://foo1.example1.com"),
+    300,
+    groupLimitBytes
+  );
+  await verifyOriginEstimation(
+    getPrincipal("https://foo2.example1.com"),
+    300,
+    groupLimitBytes
+  );
+  await verifyOriginEstimation(
+    getPrincipal("https://foo1.example2.com"),
+    700,
+    groupLimitBytes
+  );
+  await verifyOriginEstimation(
+    getPrincipal("https://foo2.example2.com"),
+    700,
+    groupLimitBytes
+  );
+
+  info("Persisting origin");
+
+  request = persist(getPrincipal("https://foo2.example2.com"));
+  await requestFinished(request);
+
+  info("Verifying origin estimation");
+
+  await verifyOriginEstimation(
+    getPrincipal("https://foo2.example2.com"),
+    1000,
+    globalLimitBytes
+  );
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_getUsage.js b/dom/quota/test/xpcshell/test_getUsage.js
new file mode 100644
index 0000000000..538af934f6
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_getUsage.js
@@ -0,0 +1,133 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const origins = [
+    {
+      origin: "http://example.com",
+      persisted: false,
+      usage: 49152,
+    },
+
+    {
+      origin: "http://localhost",
+      persisted: false,
+      usage: 147456,
+    },
+
+    {
+      origin: "http://www.mozilla.org",
+      persisted: true,
+      usage: 98304,
+    },
+  ];
+
+  const allOrigins = [
+    {
+      origin: "chrome",
+      persisted: false,
+      usage: 147456,
+    },
+
+    {
+      origin: "http://example.com",
+      persisted: false,
+      usage: 49152,
+    },
+
+    {
+      origin: "http://localhost",
+      persisted: false,
+      usage: 147456,
+    },
+
+    {
+      origin: "http://www.mozilla.org",
+      persisted: true,
+      usage: 98304,
+    },
+  ];
+
+  function verifyResult(result, expectedOrigins) {
+    ok(result instanceof Array, "Got an array object");
+    Assert.equal(
+      result.length,
+      expectedOrigins.length,
+      "Correct number of elements"
+    );
+
+    info("Sorting elements");
+
+    result.sort(function (a, b) {
+      let originA = a.origin;
+      let originB = b.origin;
+
+      if (originA < originB) {
+        return -1;
+      }
+      if (originA > originB) {
+        return 1;
+      }
+      return 0;
+    });
+
+    info("Verifying elements");
+
+    for (let i = 0; i < result.length; i++) {
+      let a = result[i];
+      let b = expectedOrigins[i];
+      Assert.equal(a.origin, b.origin, "Origin equals");
+      Assert.equal(a.persisted, b.persisted, "Persisted equals");
+      Assert.equal(a.usage, b.usage, "Usage equals");
+    }
+  }
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Getting usage");
+
+  getUsage(grabResultAndContinueHandler, /* getAll */ true);
+  let result = yield undefined;
+
+  info("Verifying result");
+
+  verifyResult(result, []);
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Installing package");
+
+  // The profile contains IndexedDB databases placed across the repositories.
+  // The file create_db.js in the package was run locally, specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  // mach xpcshell-test --interactive dom/quota/test/xpcshell/create_db.js
+  installPackage("getUsage_profile");
+
+  info("Getting usage");
+
+  getUsage(grabResultAndContinueHandler, /* getAll */ false);
+  result = yield undefined;
+
+  info("Verifying result");
+
+  verifyResult(result, origins);
+
+  info("Getting usage");
+
+  getUsage(grabResultAndContinueHandler, /* getAll */ true);
+  result = yield undefined;
+
+  info("Verifying result");
+
+  verifyResult(result, allOrigins);
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_groupMismatch.js b/dom/quota/test/xpcshell/test_groupMismatch.js
new file mode 100644
index 0000000000..41a72d51ad
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_groupMismatch.js
@@ -0,0 +1,74 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that metadata files with old group information
+ * get updated. See bug 1535995.
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+async function testSteps() {
+  const metadataFile = getRelativeFile(
+    "storage/default/https+++foo.bar.mozilla-iot.org/.metadata-v2"
+  );
+
+  async function readMetadataFile() {
+    let file = await File.createFromNsIFile(metadataFile);
+
+    let buffer = await new Promise(resolve => {
+      let reader = new FileReader();
+      reader.onloadend = () => resolve(reader.result);
+      reader.readAsArrayBuffer(file);
+    });
+
+    return buffer;
+  }
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains one initialized origin directory, a script for origin
+  // initialization and the storage database:
+  // - storage/default/https+++foo.bar.mozilla-iot.org
+  // - create_db.js
+  // - storage.sqlite
+  // The file create_db.js in the package was run locally, specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  //   mach xpcshell-test --interactive dom/localstorage/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Manually change the group in .metadata and .metadata-v2 from
+  //    "bar.mozilla-iot.org" to "mozilla-iot.org".
+  // 2. Remove the folder "storage/temporary".
+  // 3. Remove the file "storage/ls-archive.sqlite".
+  installPackage("groupMismatch_profile");
+
+  info("Reading out contents of metadata file");
+
+  let metadataBuffer = await readMetadataFile();
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Reading out contents of metadata file");
+
+  let metadataBuffer2 = await readMetadataFile();
+
+  info("Verifying blobs differ");
+
+  ok(!compareBuffers(metadataBuffer, metadataBuffer2), "Metadata differ");
+}
diff --git a/dom/quota/test/xpcshell/test_initTemporaryStorage.js b/dom/quota/test/xpcshell/test_initTemporaryStorage.js
new file mode 100644
index 0000000000..617ff2d2c9
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_initTemporaryStorage.js
@@ -0,0 +1,49 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify initTemporaryStorage() does call
+ * QuotaManager::EnsureTemporaryStorageIsInitializedInternal() which does
+ * various things, for example, it restores the directory metadata if it's
+ * broken or missing.
+ */
+
+async function testSteps() {
+  const originDirPath = "storage/default/https+++foo.example.com";
+  const metadataFileName = ".metadata-v2";
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Verifying initialization status");
+
+  await verifyInitializationStatus(true, false);
+
+  info("Creating an empty directory");
+
+  let originDir = getRelativeFile(originDirPath);
+  originDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+
+  info("Initializing the temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info(
+    "Verifying directory metadata was restored after calling " +
+      "initTemporaryStorage()"
+  );
+
+  let metadataFile = originDir.clone();
+  metadataFile.append(metadataFileName);
+
+  ok(metadataFile.exists(), "Directory metadata file does exist");
+
+  info("Verifying initialization status");
+
+  await verifyInitializationStatus(true, true);
+}
diff --git a/dom/quota/test/xpcshell/test_initializePersistentClient.js b/dom/quota/test/xpcshell/test_initializePersistentClient.js
new file mode 100644
index 0000000000..342fb80171
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_initializePersistentClient.js
@@ -0,0 +1,46 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that initializePersistentClient() does call
+ * QuotaManager::EnsurePersistentClientIsInitialized() which ensures client
+ * directory existence.
+ */
+
+async function testSteps() {
+  const clientMetadata = {
+    persistence: "default",
+    principal: getPrincipal("https://foo.example.com"),
+    client: "sdb",
+    file: getRelativeFile("storage/permanent/https+++foo.example.com/sdb"),
+  };
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing persistent origin");
+
+  request = initPersistentOrigin(clientMetadata.principal);
+  await requestFinished(request);
+
+  ok(!clientMetadata.file.exists(), "Client directory does not exist");
+
+  info("Initializing persistent client");
+
+  request = initPersistentClient(
+    clientMetadata.principal,
+    clientMetadata.client
+  );
+  await requestFinished(request);
+
+  ok(clientMetadata.file.exists(), "Client directory does exist");
+}
diff --git a/dom/quota/test/xpcshell/test_initializeTemporaryClient.js b/dom/quota/test/xpcshell/test_initializeTemporaryClient.js
new file mode 100644
index 0000000000..f721560bda
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_initializeTemporaryClient.js
@@ -0,0 +1,55 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that initializeTemporaryClient() does call
+ * QuotaManager::EnsureTemporaryClientIsInitialized() which ensures client
+ * directory existence.
+ */
+
+async function testSteps() {
+  const clientMetadata = {
+    persistence: "default",
+    principal: getPrincipal("https://foo.example.com"),
+    client: "sdb",
+    file: getRelativeFile("storage/default/https+++foo.example.com/sdb"),
+  };
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing temporary origin");
+
+  request = initTemporaryOrigin(
+    clientMetadata.persistence,
+    clientMetadata.principal
+  );
+  await requestFinished(request);
+
+  ok(!clientMetadata.file.exists(), "Client directory does not exist");
+
+  info("Initializing temporary client");
+
+  request = initTemporaryClient(
+    clientMetadata.persistence,
+    clientMetadata.principal,
+    clientMetadata.client
+  );
+  await requestFinished(request);
+
+  ok(clientMetadata.file.exists(), "Client directory does exist");
+}
diff --git a/dom/quota/test/xpcshell/test_listOrigins.js b/dom/quota/test/xpcshell/test_listOrigins.js
new file mode 100644
index 0000000000..fbd8554046
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_listOrigins.js
@@ -0,0 +1,88 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const origins = [
+    "https://example.com",
+    "https://localhost",
+    "https://www.mozilla.org",
+  ];
+
+  function verifyResult(result, expectedOrigins) {
+    ok(result instanceof Array, "Got an array object");
+    Assert.equal(
+      result.length,
+      expectedOrigins.length,
+      "Correct number of elements"
+    );
+
+    info("Sorting elements");
+
+    result.sort(function (a, b) {
+      if (a < b) {
+        return -1;
+      }
+      if (a > b) {
+        return 1;
+      }
+      return 0;
+    });
+
+    info("Verifying elements");
+
+    for (let i = 0; i < result.length; i++) {
+      Assert.equal(
+        result[i],
+        expectedOrigins[i],
+        "Result matches expected origin"
+      );
+    }
+  }
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Listing origins");
+
+  request = listOrigins();
+  await requestFinished(request);
+
+  info("Verifying result");
+
+  verifyResult(request.result, []);
+
+  info("Clearing");
+
+  request = clear();
+  await requestFinished(request);
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    request = initTemporaryOrigin("default", getPrincipal(origin));
+    await requestFinished(request);
+  }
+
+  info("Listing origins");
+
+  request = listOrigins();
+  await requestFinished(request);
+
+  info("Verifying result");
+
+  verifyResult(request.result, origins);
+}
diff --git a/dom/quota/test/xpcshell/test_originEndsWithDot.js b/dom/quota/test/xpcshell/test_originEndsWithDot.js
new file mode 100644
index 0000000000..6fd017a58b
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_originEndsWithDot.js
@@ -0,0 +1,70 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+async function testSteps() {
+  // First, ensure the origin can be initialized and used by a client that uses
+  // SQLite databases.
+
+  // Todo: consider using simpleDB once it supports using storage for SQLite.
+  info("Testing SQLite database with an origin that ends with a dot");
+
+  const principal = getPrincipal("https://example.com.");
+  let request = indexedDB.openForPrincipal(principal, "myIndexedDB");
+  await openDBRequestUpgradeNeeded(request);
+
+  info("Testing simple operations");
+
+  const database = request.result;
+
+  const objectStore = database.createObjectStore("Blobs", {});
+
+  objectStore.add(getNullBlob(200), 42);
+
+  await openDBRequestSucceeded(request);
+
+  database.close();
+
+  info("Reseting");
+
+  request = reset();
+  await requestFinished(request);
+
+  let idbDB = getRelativeFile(
+    "storage/default/https+++example.com./idb/2320029346mByDIdnedxe.sqlite"
+  );
+  ok(idbDB.exists(), "IDB database was created successfully");
+
+  // Second, ensure storage initialization works fine with the origin.
+
+  info("Testing storage initialization and temporary storage initialization");
+
+  request = init();
+  await requestFinished(request);
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  // Third, ensure QMS APIs that touch the client directory for the origin work
+  // fine.
+
+  info("Testing getUsageForPrincipal");
+
+  request = getOriginUsage(principal);
+  await requestFinished(request);
+
+  ok(
+    request.result instanceof Ci.nsIQuotaOriginUsageResult,
+    "The result is nsIQuotaOriginUsageResult instance"
+  );
+  Assert.greater(request.result.usage, 0, "Total usage is not empty");
+  Assert.greater(request.result.fileUsage, 0, "File usage is not empty");
+
+  info("Testing clearStoragesForPrincipal");
+
+  request = clearOrigin(principal, "default");
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_originMismatch.js b/dom/quota/test/xpcshell/test_originMismatch.js
new file mode 100644
index 0000000000..23186977b2
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_originMismatch.js
@@ -0,0 +1,75 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that temporary storage initialization should
+ * succeed while there is an origin directory that has an inconsistency between
+ * its directory name and the origin name in its directory metadata file.
+ */
+
+async function testSteps() {
+  const packages = ["originMismatch_profile", "defaultStorageDirectory_shared"];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing package");
+
+  // The profile contains:
+  // - storage.sqlite (v2_3)
+  // (A) Verify we are okay while the directory that we want to restore has
+  // already existed.
+  // - storage/default/http+++www.example.com/.metadata-v2
+  //   (origin: http://www.example.com.)
+  // - storage/default/http+++www.example.com/cache/.padding
+  // - storage/default/http+++www.example.com./
+  // (B) Verify restoring origin directory succeed.
+  // - storage/default/http+++www.example.org/.metadata-v2
+  //   (origin: http://www.example.org.)
+  // - storage/default/http+++www.example.org/cache/.padding
+  //
+  // ToDo: Test case like:
+  // - storage/default/http+++www.example.org(1)/.metadata-v2
+  //   (origin: http://www.example.org)
+  // - storage/default/http+++www.example.org/
+  //
+  // - storage/default/http+++www.foo.com/.metadata-v2
+  //   (origin: http://www.bar.com)
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Initializing storage");
+
+  request = init();
+  await requestFinished(request);
+
+  // ToDo: Remove this code once we support unknown directories in respository
+  // (bug 1594075).
+  let invalidDir = getRelativeFile("storage/default/invalid+++example.com");
+  invalidDir.remove(true);
+  invalidDir = getRelativeFile("storage/temporary/invalid+++example.com");
+  invalidDir.remove(true);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInitTemporaryStorage");
+
+  request = clear();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_originWithCaret.js b/dom/quota/test/xpcshell/test_originWithCaret.js
new file mode 100644
index 0000000000..7afce4f5cc
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_originWithCaret.js
@@ -0,0 +1,17 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+async function testSteps() {
+  Assert.throws(
+    () => {
+      const principal = getPrincipal("http://example.com^123");
+      getSimpleDatabase(principal);
+    },
+    /NS_ERROR_MALFORMED_URI/,
+    "^ is not allowed in the hostname"
+  );
+}
diff --git a/dom/quota/test/xpcshell/test_orpahnedQuotaObject.js b/dom/quota/test/xpcshell/test_orpahnedQuotaObject.js
new file mode 100644
index 0000000000..6cbca13d8c
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_orpahnedQuotaObject.js
@@ -0,0 +1,44 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const principal = getPrincipal("https://example.com");
+
+  info("Setting pref");
+
+  Services.prefs.setBoolPref("dom.storage.client_validation", false);
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Creating simpledb");
+
+  let database = getSimpleDatabase(principal);
+
+  request = database.open("data");
+  await requestFinished(request);
+
+  info("Creating localStorage");
+
+  let storage = Services.domStorageManager.createStorage(
+    null,
+    principal,
+    principal,
+    ""
+  );
+  storage.setItem("key", "value");
+
+  info("Clearing simpledb");
+
+  request = clearClient(principal, "default", "sdb");
+  await requestFinished(request);
+
+  info("Resetting localStorage");
+
+  request = resetClient(principal, "ls");
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_persist.js b/dom/quota/test/xpcshell/test_persist.js
new file mode 100644
index 0000000000..879343754c
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_persist.js
@@ -0,0 +1,133 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const origin = {
+    url: "http://default.test.persist",
+    path: "storage/default/http+++default.test.persist",
+    persistence: "default",
+  };
+
+  const metadataFileName = ".metadata-v2";
+
+  let principal = getPrincipal(origin.url);
+
+  info("Persisting an uninitialized origin");
+
+  // Origin directory doesn't exist yet, so only check the result for
+  // persisted().
+  let request = persisted(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persisted() succeeded");
+  ok(!request.result, "The origin is not persisted");
+
+  info("Verifying persist() does update the metadata");
+
+  request = persist(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persist() succeeded");
+
+  let originDir = getRelativeFile(origin.path);
+  let exists = originDir.exists();
+  ok(exists, "Origin directory does exist");
+
+  info("Reading out contents of metadata file");
+
+  let metadataFile = originDir.clone();
+  metadataFile.append(metadataFileName);
+
+  File.createFromNsIFile(metadataFile).then(grabArgAndContinueHandler);
+  let file = yield undefined;
+
+  let fileReader = new FileReader();
+  fileReader.onload = continueToNextStepSync;
+  fileReader.readAsArrayBuffer(file);
+  yield undefined;
+
+  let originPersisted = getPersistedFromMetadata(fileReader.result);
+  ok(originPersisted, "The origin is persisted");
+
+  info("Verifying persisted()");
+
+  request = persisted(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persisted() succeeded");
+  Assert.strictEqual(
+    request.result,
+    originPersisted,
+    "Persisted() concurs with metadata"
+  );
+
+  info("Clearing the origin");
+
+  // Clear the origin since we'll test the same directory again under different
+  // circumstances.
+  clearOrigin(principal, origin.persistence, continueToNextStepSync);
+  yield undefined;
+
+  info("Persisting an already initialized origin");
+
+  initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  initTemporaryOrigin(origin.persistence, principal, continueToNextStepSync);
+  yield undefined;
+
+  info("Reading out contents of metadata file");
+
+  fileReader = new FileReader();
+  fileReader.onload = continueToNextStepSync;
+  fileReader.readAsArrayBuffer(file);
+  yield undefined;
+
+  originPersisted = getPersistedFromMetadata(fileReader.result);
+  ok(!originPersisted, "The origin isn't persisted after clearing");
+
+  info("Verifying persisted()");
+
+  request = persisted(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persisted() succeeded");
+  Assert.strictEqual(
+    request.result,
+    originPersisted,
+    "Persisted() concurs with metadata"
+  );
+
+  info("Verifying persist() does update the metadata");
+
+  request = persist(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persist() succeeded");
+
+  info("Reading out contents of metadata file");
+
+  fileReader = new FileReader();
+  fileReader.onload = continueToNextStepSync;
+  fileReader.readAsArrayBuffer(file);
+  yield undefined;
+
+  originPersisted = getPersistedFromMetadata(fileReader.result);
+  ok(originPersisted, "The origin is persisted");
+
+  info("Verifying persisted()");
+
+  request = persisted(principal, continueToNextStepSync);
+  yield undefined;
+
+  Assert.strictEqual(request.resultCode, NS_OK, "Persisted() succeeded");
+  Assert.strictEqual(
+    request.result,
+    originPersisted,
+    "Persisted() concurs with metadata"
+  );
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_persist_eviction.js b/dom/quota/test/xpcshell/test_persist_eviction.js
new file mode 100644
index 0000000000..9a62f91b50
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_persist_eviction.js
@@ -0,0 +1,82 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that normally the oldest origin will be
+ * evicted if the global limit is reached, but if the oldest origin is
+ * persisted or is an extension origin, then it won't be evicted.
+ */
+
+loadScript("dom/quota/test/xpcshell/common/utils.js");
+
+async function testSteps() {
+  // The group limit is calculated as 20% of the global limit and the minimum
+  // value of the group limit is 10 MB.
+
+  const groupLimitKB = 10 * 1024;
+  const globalLimitKB = groupLimitKB * 5;
+
+  setGlobalLimit(globalLimitKB);
+
+  let request = clear();
+  await requestFinished(request);
+
+  for (let persistOldestOrigin of [false, true]) {
+    info(
+      "Testing " +
+        (persistOldestOrigin ? "with" : "without") +
+        " persisting the oldest origin"
+    );
+
+    info(
+      "Step 0: Filling a moz-extension origin as the oldest origin with non-persisted data"
+    );
+
+    // Just a fake moz-extension origin to mock an extension origin.
+    let extUUID = "20445ca5-75f9-420e-a1d4-9cccccb5e891";
+    let spec = `moz-extension://${extUUID}`;
+    await fillOrigin(getPrincipal(spec), groupLimitKB * 1024);
+
+    info(
+      "Step 1: Filling five separate web origins to reach the global limit " +
+        "and trigger eviction"
+    );
+
+    for (let index = 1; index <= 5; index++) {
+      let spec = "http://example" + index + ".com";
+      if (index == 1 && persistOldestOrigin) {
+        request = persist(getPrincipal(spec));
+        await requestFinished(request);
+      }
+      await fillOrigin(getPrincipal(spec), groupLimitKB * 1024);
+    }
+
+    info("Step 2: Verifying origin directories");
+
+    for (let index = 1; index <= 5; index++) {
+      let path = "storage/default/http+++example" + index + ".com";
+      let file = getRelativeFile(path);
+      if (index == (persistOldestOrigin ? 2 : 1)) {
+        ok(!file.exists(), "The origin directory " + path + " doesn't exist");
+      } else {
+        ok(file.exists(), "The origin directory " + path + " does exist");
+      }
+    }
+
+    // Verify that the extension storage data has not been evicted (even if it wasn't marked as
+    // persisted and it was the less recently used origin).
+    let path = `storage/default/moz-extension+++${extUUID}`;
+    let file = getRelativeFile(path);
+    ok(file.exists(), "The origin directory " + path + "does exist");
+
+    request = clear();
+    await requestFinished(request);
+  }
+
+  resetGlobalLimit();
+
+  request = reset();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_persist_globalLimit.js b/dom/quota/test/xpcshell/test_persist_globalLimit.js
new file mode 100644
index 0000000000..99ed0f43ff
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_persist_globalLimit.js
@@ -0,0 +1,83 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that persisted origins are always bounded by
+ * the global limit.
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+async function testSteps() {
+  const globalLimitKB = 1;
+
+  const principal = getPrincipal("https://persisted.example.com");
+
+  info("Setting limits");
+
+  setGlobalLimit(globalLimitKB);
+
+  let request = clear();
+  await requestFinished(request);
+
+  for (let initializeStorageBeforePersist of [false, true]) {
+    if (initializeStorageBeforePersist) {
+      info("Initializing");
+
+      request = init();
+      await requestFinished(request);
+
+      info("Initializing the temporary storage");
+
+      request = initTemporaryStorage();
+      await requestFinished(request);
+    }
+
+    info("Persisting an origin");
+
+    request = persist(principal);
+    await requestFinished(request);
+
+    info("Verifying the persisted origin is bounded by global limit");
+
+    let database = getSimpleDatabase(principal);
+
+    info("Opening a database for the persisted origin");
+
+    request = database.open("data");
+    await requestFinished(request);
+
+    try {
+      info("Writing over the limit shouldn't succeed");
+
+      request = database.write(getBuffer(globalLimitKB * 1024 + 1));
+      await requestFinished(request);
+
+      ok(false, "Should have thrown");
+    } catch (e) {
+      ok(true, "Should have thrown");
+      Assert.strictEqual(
+        e.resultCode,
+        NS_ERROR_FILE_NO_DEVICE_SPACE,
+        "Threw right result code"
+      );
+    }
+
+    info("Closing the database and clearing");
+
+    request = database.close();
+    await requestFinished(request);
+
+    request = clear();
+    await requestFinished(request);
+  }
+
+  info("Resetting limits");
+
+  resetGlobalLimit();
+
+  request = reset();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_persist_groupLimit.js b/dom/quota/test/xpcshell/test_persist_groupLimit.js
new file mode 100644
index 0000000000..d2dc1a987d
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_persist_groupLimit.js
@@ -0,0 +1,105 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that persisted origins are not constrained by
+ * the group limit.  It consits of these steps:
+ * - Set the limits as small as our limits allow.  This does result in needing
+ *   to perform 10 megs of writes which is a lot for a test but not horrible.
+ * - Create databases for 2 origins under the same group.
+ * - Have the foo2 origin use up the shared group quota.
+ * - Verify neither origin can write additional data (via a single byte write).
+ * - Do navigator.storage.persist() for that foo2 origin.
+ * - Verify that both origins can now write an additional byte.  This
+ *   demonstrates that:
+ *   - foo2 no longer counts against the group limit at all since foo1 can
+ *     write a byte.
+ *   - foo2 is no longer constrained by the group limit itself.
+ */
+async function testSteps() {
+  // The group limit is calculated as 20% of the global limit and the minimum
+  // value of the group limit is 10 MB.
+
+  const groupLimitKB = 10 * 1024;
+  const globalLimitKB = groupLimitKB * 5;
+
+  const urls = ["http://foo1.example.com", "http://foo2.example.com"];
+
+  const foo2Index = 1;
+
+  let index;
+
+  info("Setting limits");
+
+  setGlobalLimit(globalLimitKB);
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Opening databases");
+
+  let databases = [];
+  for (index = 0; index < urls.length; index++) {
+    let database = getSimpleDatabase(getPrincipal(urls[index]));
+
+    request = database.open("data");
+    await requestFinished(request);
+
+    databases.push(database);
+  }
+
+  info("Filling up the whole group");
+
+  try {
+    request = databases[foo2Index].write(new ArrayBuffer(groupLimitKB * 1024));
+    await requestFinished(request);
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  info("Verifying no more data can be written");
+
+  for (index = 0; index < urls.length; index++) {
+    try {
+      request = databases[index].write(new ArrayBuffer(1));
+      await requestFinished(request);
+      ok(false, "Should have thrown");
+    } catch (e) {
+      ok(true, "Should have thrown");
+      Assert.equal(
+        e.resultCode,
+        NS_ERROR_FILE_NO_DEVICE_SPACE,
+        "Threw right result code"
+      );
+    }
+  }
+
+  info("Persisting origin");
+
+  request = persist(getPrincipal(urls[foo2Index]));
+  await requestFinished(request);
+
+  info("Verifying more data data can be written");
+
+  for (index = 0; index < urls.length; index++) {
+    try {
+      request = databases[index].write(new ArrayBuffer(1));
+      await requestFinished(request);
+      ok(true, "Should not have thrown");
+    } catch (ex) {
+      ok(false, "Should not have thrown");
+    }
+  }
+
+  info("Closing databases");
+
+  for (index = 0; index < urls.length; index++) {
+    request = databases[index].close();
+    await requestFinished(request);
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_removeLocalStorage.js b/dom/quota/test/xpcshell/test_removeLocalStorage.js
new file mode 100644
index 0000000000..781c71a56f
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_removeLocalStorage.js
@@ -0,0 +1,89 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const lsArchiveFile = "storage/ls-archive.sqlite";
+  const lsArchiveTmpFile = "storage/ls-archive-tmp.sqlite";
+  const lsDir = "storage/default/http+++localhost/ls";
+
+  info("Setting pref");
+
+  SpecialPowers.setBoolPref(
+    "dom.storage.enable_unsupported_legacy_implementation",
+    true
+  );
+
+  // Profile 1
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Installing package");
+
+  installPackage("removeLocalStorage1_profile");
+
+  info("Checking ls archive tmp file");
+
+  let archiveTmpFile = getRelativeFile(lsArchiveTmpFile);
+
+  let exists = archiveTmpFile.exists();
+  ok(exists, "ls archive tmp file does exist");
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Checking ls archive file");
+
+  exists = archiveTmpFile.exists();
+  ok(!exists, "ls archive tmp file doesn't exist");
+
+  // Profile 2
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Installing package");
+
+  installPackage("removeLocalStorage2_profile");
+
+  info("Checking ls archive file");
+
+  let archiveFile = getRelativeFile(lsArchiveFile);
+
+  exists = archiveFile.exists();
+  ok(exists, "ls archive file does exist");
+
+  info("Checking ls dir");
+
+  let dir = getRelativeFile(lsDir);
+
+  exists = dir.exists();
+  ok(exists, "ls directory does exist");
+
+  info("Initializing");
+
+  request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Checking ls archive file");
+
+  exists = archiveFile.exists();
+  ok(!exists, "ls archive file doesn't exist");
+
+  info("Checking ls dir");
+
+  exists = dir.exists();
+  ok(!exists, "ls directory doesn't exist");
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_simpledb.js b/dom/quota/test/xpcshell/test_simpledb.js
new file mode 100644
index 0000000000..b698d778e0
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_simpledb.js
@@ -0,0 +1,6 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+loadScript("dom/quota/test/common/test_simpledb.js");
diff --git a/dom/quota/test/xpcshell/test_specialOrigins.js b/dom/quota/test/xpcshell/test_specialOrigins.js
new file mode 100644
index 0000000000..d66700d359
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_specialOrigins.js
@@ -0,0 +1,55 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const origins = [
+    {
+      path: "storage/default/file+++UNIVERSAL_FILE_URI_ORIGIN",
+      url: "file:///Test/test.html",
+      persistence: "default",
+    },
+  ];
+
+  info("Setting pref");
+
+  SpecialPowers.setBoolPref("security.fileuri.strict_origin_policy", false);
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Creating origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.path);
+    originDir.create(Ci.nsIFile.DIRECTORY_TYPE, parseInt("0755", 8));
+  }
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing origin directories");
+
+  for (let origin of origins) {
+    let result;
+
+    try {
+      request = initTemporaryOrigin(
+        origin.persistence,
+        getPrincipal(origin.url)
+      );
+      result = await requestFinished(request);
+
+      ok(true, "Should not have thrown");
+    } catch (ex) {
+      ok(false, "Should not have thrown");
+    }
+
+    ok(!result, "Origin directory wasn't created");
+  }
+}
diff --git a/dom/quota/test/xpcshell/test_storagePressure.js b/dom/quota/test/xpcshell/test_storagePressure.js
new file mode 100644
index 0000000000..0cf145ae1d
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_storagePressure.js
@@ -0,0 +1,136 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that the storage pressure event is fired when
+ * the eviction process is not able to free some space when a quota client
+ * attempts to write over the global limit or when the global limit is reduced
+ * below the global usage.
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+function awaitStoragePressure() {
+  let promise_resolve;
+
+  let promise = new Promise(function (resolve) {
+    promise_resolve = resolve;
+  });
+
+  function observer(subject, topic) {
+    ok(true, "Got the storage pressure event");
+
+    Services.obs.removeObserver(observer, topic);
+
+    let usage = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
+    promise_resolve(usage);
+  }
+
+  Services.obs.addObserver(observer, "QuotaManager::StoragePressure");
+
+  return promise;
+}
+
+async function testSteps() {
+  const globalLimitKB = 2;
+
+  const principal = getPrincipal("https://example.com");
+
+  info("Setting limits");
+
+  setGlobalLimit(globalLimitKB);
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Persisting and filling an origin");
+
+  // We need to persist the origin first to omit the group limit checks.
+  // Otherwise, we would have to fill five separate origins.
+  request = persist(principal);
+  await requestFinished(request);
+
+  let database = getSimpleDatabase(principal);
+
+  request = database.open("data");
+  await requestFinished(request);
+
+  try {
+    request = database.write(getBuffer(globalLimitKB * 1024));
+    await requestFinished(request);
+
+    ok(true, "Should not have thrown");
+  } catch (ex) {
+    ok(false, "Should not have thrown");
+  }
+
+  info("Testing storage pressure by writing over the global limit");
+
+  info("Storing one more byte to get the storage pressure event while writing");
+
+  let promiseStoragePressure = awaitStoragePressure();
+
+  try {
+    request = database.write(getBuffer(1));
+    await requestFinished(request);
+
+    ok(false, "Should have thrown");
+  } catch (e) {
+    ok(true, "Should have thrown");
+    Assert.strictEqual(
+      e.resultCode,
+      NS_ERROR_FILE_NO_DEVICE_SPACE,
+      "Threw right result code"
+    );
+  }
+
+  info("Checking the storage pressure event");
+
+  let usage = await promiseStoragePressure;
+  Assert.equal(usage, globalLimitKB * 1024, "Got correct usage");
+
+  info("Testing storage pressure by reducing the global limit");
+
+  info(
+    "Reducing the global limit to get the storage pressuse event while the" +
+      " temporary storage is being initialized"
+  );
+
+  setGlobalLimit(globalLimitKB - 1);
+
+  request = reset();
+  await requestFinished(request);
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  promiseStoragePressure = awaitStoragePressure();
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Checking the storage pressure event");
+
+  usage = await promiseStoragePressure;
+  Assert.equal(usage, globalLimitKB * 1024, "Got correct usage");
+
+  info("Resetting limits");
+
+  resetGlobalLimit();
+
+  request = reset();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_tempMetadataCleanup.js b/dom/quota/test/xpcshell/test_tempMetadataCleanup.js
new file mode 100644
index 0000000000..3110c0b2a5
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_tempMetadataCleanup.js
@@ -0,0 +1,45 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const tempMetadataFiles = [
+    "storage/permanent/chrome/.metadata-tmp",
+    "storage/permanent/chrome/.metadata-v2-tmp",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Installing package");
+
+  installPackage("tempMetadataCleanup_profile");
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  info("Initializing origin");
+
+  request = initPersistentOrigin(getCurrentPrincipal(), continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  ok(!request.result, "Origin directory wasn't created");
+
+  for (let tempMetadataFile of tempMetadataFiles) {
+    info("Checking temp metadata file");
+
+    let file = getRelativeFile(tempMetadataFile);
+
+    let exists = file.exists();
+    ok(!exists, "Temp metadata file doesn't exist");
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/test_unaccessedOrigins.js b/dom/quota/test/xpcshell/test_unaccessedOrigins.js
new file mode 100644
index 0000000000..93b38501f4
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_unaccessedOrigins.js
@@ -0,0 +1,168 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const SEC_PER_MONTH = 60 * 60 * 24 * 30;
+
+async function testSteps() {
+  function getHostname(index) {
+    return "www.example" + index + ".com";
+  }
+
+  function getOrigin(index) {
+    return "https://" + getHostname(index);
+  }
+
+  function getOriginDir(index) {
+    return getRelativeFile("storage/default/https+++" + getHostname(index));
+  }
+
+  function updateOriginLastAccessTime(index, deltaSec) {
+    let originDir = getOriginDir(index);
+
+    let metadataFile = originDir.clone();
+    metadataFile.append(".metadata-v2");
+
+    let fileRandomAccessStream = Cc[
+      "@mozilla.org/network/file-random-access-stream;1"
+    ].createInstance(Ci.nsIFileRandomAccessStream);
+    fileRandomAccessStream.init(metadataFile, -1, -1, 0);
+
+    let binaryInputStream = Cc[
+      "@mozilla.org/binaryinputstream;1"
+    ].createInstance(Ci.nsIBinaryInputStream);
+    binaryInputStream.setInputStream(fileRandomAccessStream);
+
+    let lastAccessTime = binaryInputStream.read64();
+
+    let seekableStream = fileRandomAccessStream.QueryInterface(
+      Ci.nsISeekableStream
+    );
+    seekableStream.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
+
+    binaryOutputStream = Cc["@mozilla.org/binaryoutputstream;1"].createInstance(
+      Ci.nsIBinaryOutputStream
+    );
+    binaryOutputStream.setOutputStream(fileRandomAccessStream);
+
+    binaryOutputStream.write64(lastAccessTime + deltaSec * PR_USEC_PER_SEC);
+
+    binaryOutputStream.close();
+
+    binaryInputStream.close();
+  }
+
+  function verifyOriginDir(index, shouldExist) {
+    let originDir = getOriginDir(index);
+    let exists = originDir.exists();
+    if (shouldExist) {
+      ok(exists, "Origin directory does exist");
+    } else {
+      ok(!exists, "Origin directory doesn't exist");
+    }
+  }
+
+  info("Setting prefs");
+
+  Services.prefs.setBoolPref("dom.quotaManager.loadQuotaFromCache", false);
+  Services.prefs.setBoolPref("dom.quotaManager.checkQuotaInfoLoadTime", true);
+  Services.prefs.setIntPref(
+    "dom.quotaManager.longQuotaInfoLoadTimeThresholdMs",
+    0
+  );
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing origins");
+
+  for (let index = 0; index < 30; index++) {
+    request = initTemporaryOrigin("default", getPrincipal(getOrigin(index)));
+    await requestFinished(request);
+  }
+
+  info("Updating last access time of selected origins");
+
+  for (let index = 0; index < 10; index++) {
+    updateOriginLastAccessTime(index, -14 * SEC_PER_MONTH);
+  }
+
+  for (let index = 10; index < 20; index++) {
+    updateOriginLastAccessTime(index, -7 * SEC_PER_MONTH);
+  }
+
+  info("Resetting");
+
+  request = reset();
+  await requestFinished(request);
+
+  info("Setting pref");
+
+  Services.prefs.setIntPref(
+    "dom.quotaManager.unaccessedForLongTimeThresholdSec",
+    13 * SEC_PER_MONTH
+  );
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Verifying origin directories");
+
+  for (let index = 0; index < 10; index++) {
+    verifyOriginDir(index, false);
+  }
+  for (let index = 10; index < 30; index++) {
+    verifyOriginDir(index, true);
+  }
+
+  info("Resetting");
+
+  request = reset();
+  await requestFinished(request);
+
+  info("Setting pref");
+
+  Services.prefs.setIntPref(
+    "dom.quotaManager.unaccessedForLongTimeThresholdSec",
+    6 * SEC_PER_MONTH
+  );
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Verifying origin directories");
+
+  for (let index = 0; index < 20; index++) {
+    verifyOriginDir(index, false);
+  }
+  for (let index = 20; index < 30; index++) {
+    verifyOriginDir(index, true);
+  }
+
+  info("Resetting");
+
+  request = reset();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/test_unknownFiles.js b/dom/quota/test/xpcshell/test_unknownFiles.js
new file mode 100644
index 0000000000..57918eb0ad
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_unknownFiles.js
@@ -0,0 +1,106 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that init, initTemporaryStorage,
+ * getUsageForPrincipal and clearStoragesForPrincipal are able to ignore
+ * unknown files and directories in the storage/default directory and its
+ * subdirectories.
+ */
+async function testSteps() {
+  const principal = getPrincipal("http://example.com");
+
+  async function testFunctionality(testFunction) {
+    const modes = [
+      {
+        initializedStorage: false,
+        initializedTemporaryStorage: false,
+      },
+      {
+        initializedStorage: true,
+        initializedTemporaryStorage: false,
+      },
+      {
+        initializedStorage: true,
+        initializedTemporaryStorage: true,
+      },
+    ];
+
+    for (const mode of modes) {
+      info("Clearing");
+
+      let request = clear();
+      await requestFinished(request);
+
+      info("Installing package");
+
+      // The profile contains unknown files and unknown directories placed
+      // across the repositories, origin directories and client directories.
+      // The file make_unknownFiles.js was run locally, specifically it was
+      // temporarily enabled in xpcshell.ini and then executed:
+      // mach test --interactive dom/quota/test/xpcshell/make_unknownFiles.js
+      installPackage("unknownFiles_profile");
+
+      if (mode.initializedStorage) {
+        info("Initializing storage");
+
+        request = init();
+        await requestFinished(request);
+      }
+
+      if (mode.initializedTemporaryStorage) {
+        info("Initializing temporary storage");
+
+        request = initTemporaryStorage();
+        await requestFinished(request);
+      }
+
+      info("Verifying initialization status");
+
+      await verifyInitializationStatus(
+        mode.initializedStorage,
+        mode.initializedTemporaryStorage
+      );
+
+      await testFunction(
+        mode.initializedStorage,
+        mode.initializedTemporaryStorage
+      );
+
+      info("Clearing");
+
+      request = clear();
+      await requestFinished(request);
+    }
+  }
+
+  // init and initTemporaryStorage functionality is tested in the
+  // testFunctionality function as part of the multi mode testing
+
+  info("Testing getUsageForPrincipal functionality");
+
+  await testFunctionality(async function () {
+    info("Getting origin usage");
+
+    request = getOriginUsage(principal);
+    await requestFinished(request);
+
+    ok(
+      request.result instanceof Ci.nsIQuotaOriginUsageResult,
+      "The result is nsIQuotaOriginUsageResult instance"
+    );
+    is(request.result.usage, 115025, "Correct total usage");
+    is(request.result.fileUsage, 200, "Correct file usage");
+  });
+
+  info("Testing clearStoragesForPrincipal functionality");
+
+  await testFunctionality(async function () {
+    info("Clearing origin");
+
+    request = clearOrigin(principal, "default");
+    await requestFinished(request);
+  });
+}
diff --git a/dom/quota/test/xpcshell/test_unsetLastAccessTime.js b/dom/quota/test/xpcshell/test_unsetLastAccessTime.js
new file mode 100644
index 0000000000..cff7a5e2f0
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_unsetLastAccessTime.js
@@ -0,0 +1,68 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+async function testSteps() {
+  const metadataFile = getRelativeFile(
+    "storage/default/https+++foo.example.com/.metadata-v2"
+  );
+
+  function getLastAccessTime() {
+    let fileInputStream = Cc[
+      "@mozilla.org/network/file-input-stream;1"
+    ].createInstance(Ci.nsIFileInputStream);
+
+    fileInputStream.init(metadataFile, -1, -1, 0);
+
+    let binaryInputStream = Cc[
+      "@mozilla.org/binaryinputstream;1"
+    ].createInstance(Ci.nsIBinaryInputStream);
+
+    binaryInputStream.setInputStream(fileInputStream);
+
+    let lastAccessTime = BigInt.asIntN(64, BigInt(binaryInputStream.read64()));
+
+    binaryInputStream.close();
+
+    return lastAccessTime;
+  }
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains one initialized origin directory and the storage
+  // database:
+  // - storage/default/https+++foo.example.com
+  // - storage.sqlite
+  // The file make_unsetLastAccessTime.js was run locally, specifically it was
+  // temporarily enabled in xpcshell.ini and then executed:
+  // mach test --interactive dom/quota/test/xpcshell/make_unsetLastAccessTime.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/temporary".
+  // 2. Remove the file "storage/ls-archive.sqlite".
+  installPackage("unsetLastAccessTime_profile");
+
+  info("Verifying last access time");
+
+  Assert.equal(getLastAccessTime(), INT64_MIN, "Correct last access time");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Verifying last access time");
+
+  Assert.notEqual(getLastAccessTime(), INT64_MIN, "Correct last access time");
+}
diff --git a/dom/quota/test/xpcshell/test_validOrigins.js b/dom/quota/test/xpcshell/test_validOrigins.js
new file mode 100644
index 0000000000..74db0ea531
--- /dev/null
+++ b/dom/quota/test/xpcshell/test_validOrigins.js
@@ -0,0 +1,100 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Use initOrigin to test the operation of the origin parser on a list of URLs
+// we should support. If the origin doesn't parse, then initOrigin will throw an
+// exception (and potentially MOZ_ASSERT under debug builds). Handling of
+// obsolete or invalid origins is handled in other test files.
+async function testSteps() {
+  const basePath = "storage/default/";
+  const longExampleOriginSubstring = "a".repeat(
+    255 - "https://example..com".length
+  );
+  const origins = [
+    // General
+    {
+      dirName: "https+++example.com",
+      url: "https://example.com",
+    },
+    {
+      dirName: "https+++smaug----.github.io",
+      url: "https://smaug----.github.io/",
+    },
+    // About
+    {
+      dirName: "about+home",
+      url: "about:home",
+    },
+    {
+      dirName: "about+reader",
+      url: "about:reader",
+    },
+    // IPv6
+    {
+      dirName: "https+++[++]",
+      url: "https://[::]",
+    },
+    {
+      dirName: "https+++[ffff+ffff+ffff+ffff+ffff+ffff+ffff+ffff]",
+      url: "https://[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]",
+    },
+    {
+      dirName: "http+++[2010+836b+4179++836b+4179]",
+      url: "http://[2010:836B:4179::836B:4179]:80",
+    },
+    {
+      dirName: "https+++[++ffff+8190+3426]",
+      url: "https://[::FFFF:129.144.52.38]",
+    },
+    // MAX_PATH on Windows (260); storage/default/https+++example.{a....a}.com
+    // should have already exceeded the MAX_PATH limitation on Windows.
+    // There is a limitation (255) for each component on Windows so that we can
+    // only let the component be 255 chars and expect the wwhole path to be
+    // greater then 260.
+    {
+      dirName: `https+++example.${longExampleOriginSubstring}.com`,
+      url: `https://example.${longExampleOriginSubstring}.com`,
+    },
+    // EndingWithPeriod
+    {
+      dirName: "https+++example.com.",
+      url: "https://example.com.",
+    },
+  ];
+
+  info("Initializing");
+
+  let request = init();
+  await requestFinished(request);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  for (let origin of origins) {
+    info(`Testing ${origin.url}`);
+
+    try {
+      request = initTemporaryOrigin("default", getPrincipal(origin.url));
+      await requestFinished(request);
+
+      ok(true, "Should not have thrown");
+    } catch (ex) {
+      ok(false, "Should not have thrown");
+    }
+
+    let dir = getRelativeFile(basePath + origin.dirName);
+    ok(dir.exists(), "Origin was created");
+    Assert.strictEqual(
+      origin.dirName,
+      dir.leafName,
+      `Origin ${origin.dirName} was created expectedly`
+    );
+  }
+
+  request = clear();
+  await requestFinished(request);
+}
diff --git a/dom/quota/test/xpcshell/unknownFiles_profile.zip b/dom/quota/test/xpcshell/unknownFiles_profile.zip
new file mode 100644
index 0000000000..75bfa09003
--- /dev/null
+++ b/dom/quota/test/xpcshell/unknownFiles_profile.zip
diff --git a/dom/quota/test/xpcshell/unsetLastAccessTime_profile.zip b/dom/quota/test/xpcshell/unsetLastAccessTime_profile.zip
new file mode 100644
index 0000000000..2b14ca7276
--- /dev/null
+++ b/dom/quota/test/xpcshell/unsetLastAccessTime_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.json b/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.json
new file mode 100644
index 0000000000..f04f79a6d7
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.json
@@ -0,0 +1,64 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "https+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "sdb",
+                    "dir": true,
+                    "entries": [{ "name": "data.sdb", "dir": false }]
+                  },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "https+++www.mozilla.org^userContextId=1",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "sdb",
+                    "dir": true,
+                    "entries": [{ "name": "data.sdb", "dir": false }]
+                  },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.zip b/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.zip
new file mode 100644
index 0000000000..c09b503c18
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/cacheVersion1_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/head.js b/dom/quota/test/xpcshell/upgrades/head.js
new file mode 100644
index 0000000000..5c36d82ca6
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/head.js
@@ -0,0 +1,14 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// The path to the top level directory.
+const depth = "../../../../../";
+
+loadScript("dom/quota/test/xpcshell/common/head.js");
+
+function loadScript(path) {
+  let uri = Services.io.newFileURI(do_get_file(depth + path));
+  Services.scriptloader.loadSubScript(uri.spec);
+}
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.json b/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.json
new file mode 100644
index 0000000000..db66d824eb
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.json
@@ -0,0 +1,63 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "indexedDB",
+        "dir": true,
+        "entries": [
+          {
+            "name": "http+++www.mozilla.org",
+            "dir": true,
+            "entries": [{ "name": ".metadata", "dir": false }]
+          }
+        ]
+      },
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.zip b/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.zip
new file mode 100644
index 0000000000..63936ecf9a
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBAndPersistentStorageDirectory_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.json b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.json
new file mode 100644
index 0000000000..7916c25b73
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.json
@@ -0,0 +1,55 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "indexedDB",
+        "dir": true,
+        "entries": [
+          { "name": "1007+f+app+++system.gaiamobile.org", "dir": true },
+          { "name": "http+++www.mozilla.org", "dir": true },
+          { "name": "1007+t+https+++developer.cdn.mozilla.net", "dir": true }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.zip b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.zip
new file mode 100644
index 0000000000..a0a56a77df
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_flatOriginDirectories_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.json b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.json
new file mode 100644
index 0000000000..715c954915
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.json
@@ -0,0 +1,65 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "indexedDB",
+        "dir": true,
+        "entries": [
+          {
+            "name": "1007+f+app+++system.gaiamobile.org",
+            "dir": true,
+            "entries": [{ "name": ".metadata", "dir": false }]
+          },
+          {
+            "name": "http+++www.mozilla.org",
+            "dir": true,
+            "entries": [{ "name": ".metadata", "dir": false }]
+          },
+          {
+            "name": "1007+t+https+++developer.cdn.mozilla.net",
+            "dir": true,
+            "entries": [{ "name": ".metadata", "dir": false }]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.zip b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.zip
new file mode 100644
index 0000000000..589e65ec82
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/indexedDBDirectory_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/localStorageArchive1upgrade_profile.zip b/dom/quota/test/xpcshell/upgrades/localStorageArchive1upgrade_profile.zip
new file mode 100644
index 0000000000..a17b90dedf
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/localStorageArchive1upgrade_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/localStorageArchive4upgrade_profile.zip b/dom/quota/test/xpcshell/upgrades/localStorageArchive4upgrade_profile.zip
new file mode 100644
index 0000000000..cf5b29adae
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/localStorageArchive4upgrade_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/localStorageArchiveDowngrade_profile.zip b/dom/quota/test/xpcshell/upgrades/localStorageArchiveDowngrade_profile.zip
new file mode 100644
index 0000000000..2f11abe858
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/localStorageArchiveDowngrade_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.json b/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.json
new file mode 100644
index 0000000000..a25f257573
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.json
@@ -0,0 +1,63 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              }
+            ]
+          },
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.zip b/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.zip
new file mode 100644
index 0000000000..9ddd9af6a9
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentAndDefaultStorageDirectory_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.json b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.json
new file mode 100644
index 0000000000..c80a3cc283
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.json
@@ -0,0 +1,64 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              { "name": "1007+f+app+++system.gaiamobile.org", "dir": true },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.net",
+                "dir": true
+              },
+              { "name": "http+++www.mozilla.org", "dir": true }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.zip b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.zip
new file mode 100644
index 0000000000..436ebf9070
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_flatOriginDirectories_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.json b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.json
new file mode 100644
index 0000000000..98d23af161
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.json
@@ -0,0 +1,92 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "1007+f+app+++system.gaiamobile.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false }
+                ]
+              },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false }
+                ]
+              },
+              { "name": "http+++www.mozilla.org+8080", "dir": true }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org+8080",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.zip b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.zip
new file mode 100644
index 0000000000..0c5200adf4
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_originDirectories_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.json b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.json
new file mode 100644
index 0000000000..f5d6a4a749
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.json
@@ -0,0 +1,382 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "persistent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "1007+f+app+++system.gaiamobile.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++Users+joe+c+++index.html",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "moz-safe-about+home",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "https+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++Users+joe+index.html",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++localhost",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++c++",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++c++Users+joe+index.html",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++c++Users+joe+",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++127.0.0.1",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++++index.html",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++www.mozilla.org+8080",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "moz-safe-about+++home",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "resource+++fx-share-addon-at-mozilla-dot-org-fx-share-addon-data",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "indexeddb+++fx-devtools",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "https+++www.mozilla.org+8080",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "file++++Users+joe+",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "1007+f+app+++system.gaiamobile.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++localhost",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++localhost+82",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              { "name": "http+++localhost+81", "dir": true }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "file++++Users+joe+c+++index.html",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "https+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++Users+joe+index.html",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++localhost",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++c++",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++c++Users+joe+index.html",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++c++Users+joe+",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++127.0.0.1",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++++index.html",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org+8080",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "https+++www.mozilla.org+8080",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "file++++Users+joe+",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++localhost",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++localhost+82",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++localhost+81",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-safe-about+home",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "resource+++fx-share-addon-at-mozilla-dot-org-fx-share-addon-data",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "indexeddb+++fx-devtools",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.zip b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.zip
new file mode 100644
index 0000000000..ab8c045be9
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/persistentStorageDirectory_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/test_localStorageArchive1upgrade.js b/dom/quota/test/xpcshell/upgrades/test_localStorageArchive1upgrade.js
new file mode 100644
index 0000000000..f697d9167e
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_localStorageArchive1upgrade.js
@@ -0,0 +1,65 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that local storage directories are removed
+ * during local storage archive upgrade from version 0 to version 1.
+ * See bug 1546305.
+ */
+
+async function testSteps() {
+  const lsDirs = [
+    "storage/default/http+++example.com/ls",
+    "storage/default/http+++localhost/ls",
+    "storage/default/http+++www.mozilla.org/ls",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains three initialized origin directories with local
+  // storage data, local storage archive, a script for origin initialization,
+  // the storage database and the web apps store database:
+  // - storage/default/https+++example.com
+  // - storage/default/https+++localhost
+  // - storage/default/https+++www.mozilla.org
+  // - storage/ls-archive.sqlite
+  // - create_db.js
+  // - storage.sqlite
+  // - webappsstore.sqlite
+  // The file create_db.js in the package was run locally (with a build that
+  // doesn't support local storage archive upgrades), specifically it was
+  // temporarily added to xpcshell.ini and then executed:
+  //   mach xpcshell-test --interactive dom/localstorage/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/temporary".
+  installPackage("localStorageArchive1upgrade_profile");
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(exists, "ls directory does exist");
+  }
+
+  request = init();
+  request = await requestFinished(request);
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(!exists, "ls directory doesn't exist");
+  }
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_localStorageArchive4upgrade.js b/dom/quota/test/xpcshell/upgrades/test_localStorageArchive4upgrade.js
new file mode 100644
index 0000000000..0b0fcfccd6
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_localStorageArchive4upgrade.js
@@ -0,0 +1,107 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that local storage directories are removed
+ * during local storage archive upgrade from version 3 to version 4.
+ * See bug 1549654.
+ */
+
+async function testSteps() {
+  const lsDirs = [
+    "storage/default/http+++localhost/ls",
+    "storage/default/http+++www.mozilla.org/ls",
+    "storage/default/http+++example.com/ls",
+  ];
+
+  const principalInfos = [
+    "http://localhost",
+    "http://www.mozilla.org",
+    "http://example.com",
+  ];
+
+  const data = [
+    { key: "foo0", value: "bar" },
+    { key: "foo1", value: "A" },
+    { key: "foo2", value: "A".repeat(100) },
+  ];
+
+  function getLocalStorage(principal) {
+    return Services.domStorageManager.createStorage(
+      null,
+      principal,
+      principal,
+      ""
+    );
+  }
+
+  info("Setting pref");
+
+  // xpcshell globals don't have associated clients in the Clients API sense, so
+  // we need to disable client validation so that this xpcshell test is allowed
+  // to use LocalStorage.
+  Services.prefs.setBoolPref("dom.storage.client_validation", false);
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains three initialized origin directories with local
+  // storage data, local storage archive, a script for origin initialization,
+  // the storage database and the web apps store database:
+  // - storage/default/https+++example.com
+  // - storage/default/https+++localhost
+  // - storage/default/https+++www.mozilla.org
+  // - storage/ls-archive.sqlite
+  // - create_db.js
+  // - storage.sqlite
+  // - webappsstore.sqlite
+  // The file create_db.js in the package was run locally (with a build with
+  // local storage archive version 3), specifically it was temporarily added to
+  // xpcshell.ini and then executed:
+  //   mach xpcshell-test --interactive dom/localstorage/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/temporary".
+  installPackage("localStorageArchive4upgrade_profile");
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(exists, "ls directory does exist");
+  }
+
+  request = init();
+  request = await requestFinished(request);
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(!exists, "ls directory doesn't exist");
+  }
+
+  info("Getting storages");
+
+  let storages = [];
+  for (let i = 0; i < principalInfos.length; i++) {
+    let storage = getLocalStorage(getPrincipal(principalInfos[i]));
+    storages.push(storage);
+  }
+
+  info("Verifying data");
+
+  for (let i = 0; i < storages.length; i++) {
+    is(storages[i].getItem(data[i].key), data[i].value, "Correct value");
+  }
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_localStorageArchiveDowngrade.js b/dom/quota/test/xpcshell/upgrades/test_localStorageArchiveDowngrade.js
new file mode 100644
index 0000000000..8ca46f01d5
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_localStorageArchiveDowngrade.js
@@ -0,0 +1,66 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that local storage directories are removed
+ * during local storage archive downgrade from any future version to current
+ * version. See bug 1546305.
+ */
+
+async function testSteps() {
+  const lsDirs = [
+    "storage/default/http+++example.com/ls",
+    "storage/default/http+++localhost/ls",
+    "storage/default/http+++www.mozilla.org/ls",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Installing package");
+
+  // The profile contains three initialized origin directories with local
+  // storage data, local storage archive, a script for origin initialization,
+  // the storage database and the web apps store database:
+  // - storage/default/https+++example.com
+  // - storage/default/https+++localhost
+  // - storage/default/https+++www.mozilla.org
+  // - storage/ls-archive.sqlite
+  // - create_db.js
+  // - storage.sqlite
+  // - webappsstore.sqlite
+  // The file create_db.js in the package was run locally (with a build that
+  // supports local storage archive upgrades and local storage archive version
+  // set to max integer), specifically it was temporarily added to xpcshell.ini
+  // and then executed:
+  //   mach xpcshell-test --interactive dom/localstorage/test/xpcshell/create_db.js
+  // Note: to make it become the profile in the test, additional manual steps
+  // are needed.
+  // 1. Remove the folder "storage/temporary".
+  installPackage("localStorageArchiveDowngrade_profile");
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(exists, "ls directory does exist");
+  }
+
+  request = init();
+  request = await requestFinished(request);
+
+  info("Checking ls dirs");
+
+  for (let lsDir of lsDirs) {
+    let dir = getRelativeFile(lsDir);
+
+    exists = dir.exists();
+    ok(!exists, "ls directory doesn't exist");
+  }
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeCacheFrom1.js b/dom/quota/test/xpcshell/upgrades/test_upgradeCacheFrom1.js
new file mode 100644
index 0000000000..e9424e20c6
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeCacheFrom1.js
@@ -0,0 +1,79 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify UpgradeCacheFrom1To2 method.
+ */
+
+async function testSteps() {
+  const packages = [
+    // Storage used prior FF 88 (cache version 1).
+    // The profile contains one initialized origin directory with simple
+    // database data, a script for origin initialization and the storage
+    // database:
+    // - storage/default/https+++www.mozilla.org^userContextId=1
+    // - create_db.js
+    // - storage.sqlite
+    // The file create_db.js in the package was run locally, specifically it was
+    // temporarily added to xpcshell.ini and then executed:
+    //   mach xpcshell-test dom/quota/test/xpcshell/upgrades/create_db.js
+    //   --interactive
+    // Note: to make it become the profile in the test, additional manual steps
+    // are needed.
+    // 1. Remove the folder "storage/temporary".
+    // 2. Remove the file "storage/ls-archive.sqlite".
+    "cacheVersion1_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+  const principal = getPrincipal("https://www.mozilla.org", {
+    userContextId: 1,
+  });
+  const originUsage = 100;
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing package");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  await requestFinished(request);
+
+  info("Getting origin usage");
+
+  request = getOriginUsage(principal, /* fromMemory */ true);
+  await requestFinished(request);
+
+  info("Verifying origin usage");
+
+  is(request.result.usage, originUsage, "Correct origin usage");
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromFlatOriginDirectories.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromFlatOriginDirectories.js
new file mode 100644
index 0000000000..66396fef6c
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromFlatOriginDirectories.js
@@ -0,0 +1,187 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// A flat origin directory is an origin directory with no sub directories for
+// quota clients. The upgrade was initially done lazily and an empty .metadata
+// file was used to indicate a successful upgrade.
+
+function* testSteps() {
+  const setups = [
+    {
+      packages: [
+        // Storage used prior FF 22 (indexedDB/ directory with flat origin
+        // directories).
+        // FF 26 renamed indexedDB/ to storage/persistent and the lazy upgrade
+        // of flat origin directories remained. There's a test for that below.
+        "indexedDBDirectory_flatOriginDirectories_profile",
+        "../indexedDBDirectory_shared",
+      ],
+      origins: [
+        {
+          oldPath: "indexedDB/1007+f+app+++system.gaiamobile.org",
+        },
+
+        {
+          oldPath: "indexedDB/1007+t+https+++developer.cdn.mozilla.net",
+        },
+
+        {
+          oldPath: "indexedDB/http+++www.mozilla.org",
+          newPath: "storage/default/http+++www.mozilla.org",
+          url: "http://www.mozilla.org",
+          persistence: "default",
+        },
+      ],
+    },
+
+    {
+      packages: [
+        // Storage used by FF 26-35 (storage/persistent/ directory with not yet
+        // upgraded flat origin directories).
+        // FF 36 renamed storage/persistent/ to storage/default/ and all not
+        // yet upgraded flat origin directories were upgraded. There's a
+        // separate test for that:
+        // test_upgradeFromPersistentStorageDirectory_upgradeOriginDirectories.
+        "persistentStorageDirectory_flatOriginDirectories_profile",
+        "../persistentStorageDirectory_shared",
+      ],
+      origins: [
+        {
+          oldPath: "storage/persistent/1007+f+app+++system.gaiamobile.org",
+        },
+
+        {
+          oldPath:
+            "storage/persistent/1007+t+https+++developer.cdn.mozilla.net",
+        },
+
+        {
+          oldPath: "storage/persistent/http+++www.mozilla.org",
+          newPath: "storage/default/http+++www.mozilla.org",
+          url: "http://www.mozilla.org",
+          persistence: "default",
+        },
+      ],
+    },
+  ];
+
+  const metadataFileName = ".metadata";
+
+  for (const setup of setups) {
+    clear(continueToNextStepSync);
+    yield undefined;
+
+    info("Verifying storage");
+
+    verifyStorage(setup.packages, "beforeInstall");
+
+    info("Installing packages");
+
+    installPackages(setup.packages);
+
+    info("Verifying storage");
+
+    verifyStorage(setup.packages, "afterInstall");
+
+    info("Checking origin directories");
+
+    for (const origin of setup.origins) {
+      let originDir = getRelativeFile(origin.oldPath);
+      let exists = originDir.exists();
+      ok(exists, "Origin directory does exist");
+
+      let idbDir = originDir.clone();
+      idbDir.append("idb");
+
+      exists = idbDir.exists();
+      ok(!exists, "idb directory doesn't exist");
+
+      let metadataFile = originDir.clone();
+      metadataFile.append(metadataFileName);
+
+      exists = metadataFile.exists();
+      ok(!exists, "Metadata file doesn't exist");
+
+      if (origin.newPath) {
+        originDir = getRelativeFile(origin.newPath);
+        exists = originDir.exists();
+        ok(!exists, "Origin directory doesn't exist");
+      }
+    }
+
+    info("Initializing");
+
+    let request = init(continueToNextStepSync);
+    yield undefined;
+
+    Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+    info("Verifying storage");
+
+    verifyStorage(setup.packages, "afterInit");
+
+    // TODO: Remove this block once temporary storage initialization is able to
+    //       ignore unknown directories.
+    getRelativeFile("storage/default/invalid+++example.com").remove(false);
+    try {
+      getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+    } catch (ex) {}
+
+    info("Checking origin directories");
+
+    for (const origin of setup.origins) {
+      let originDir = getRelativeFile(origin.oldPath);
+      let exists = originDir.exists();
+      ok(!exists, "Origin directory doesn't exist");
+
+      if (origin.newPath) {
+        originDir = getRelativeFile(origin.newPath);
+        exists = originDir.exists();
+        ok(exists, "Origin directory does exist");
+
+        let idbDir = originDir.clone();
+        idbDir.append("idb");
+
+        exists = idbDir.exists();
+        ok(exists, "idb directory does exist");
+
+        let metadataFile = originDir.clone();
+        metadataFile.append(metadataFileName);
+
+        exists = metadataFile.exists();
+        ok(exists, "Metadata file does exist");
+      }
+    }
+
+    info("Initializing temporary storage");
+
+    request = initTemporaryStorage(continueToNextStepSync);
+    yield undefined;
+
+    Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+    info("Initializing origins");
+
+    for (const origin of setup.origins) {
+      if (origin.newPath) {
+        info("Initializing origin");
+
+        let principal = getPrincipal(origin.url);
+        request = initTemporaryOrigin(
+          origin.persistence,
+          principal,
+          continueToNextStepSync
+        );
+        yield undefined;
+
+        Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+        ok(!request.result, "Origin directory wasn't created");
+      }
+    }
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory.js
new file mode 100644
index 0000000000..fb6ad9c5a7
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory.js
@@ -0,0 +1,121 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify
+ * MaybeUpgradeFromIndexedDBDirectoryToPersistentStorageDirectory method.
+ */
+
+function* testSteps() {
+  const origins = [
+    {
+      oldPath: "indexedDB/http+++www.mozilla.org",
+      newPath: "storage/default/http+++www.mozilla.org",
+      url: "http://www.mozilla.org",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "indexedDB/1007+f+app+++system.gaiamobile.org",
+    },
+
+    {
+      oldPath: "indexedDB/1007+t+https+++developer.cdn.mozilla.net",
+    },
+  ];
+
+  const packages = [
+    // Storage used prior FF 26 (indexedDB/ directory).
+    "indexedDBDirectory_profile",
+    "../indexedDBDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing package");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    if (origin.newPath) {
+      originDir = getRelativeFile(origin.newPath);
+      exists = originDir.exists();
+      ok(!exists, "Origin directory doesn't exist");
+    }
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(!exists, "Origin directory doesn't exist");
+
+    if (origin.newPath) {
+      originDir = getRelativeFile(origin.newPath);
+      exists = originDir.exists();
+      ok(exists, "Origin directory does exist");
+    }
+  }
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    if (origin.newPath) {
+      info("Initializing origin");
+
+      let principal = getPrincipal(origin.url);
+      request = initTemporaryOrigin(
+        origin.persistence,
+        principal,
+        continueToNextStepSync
+      );
+      yield undefined;
+
+      Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+      ok(!request.result, "Origin directory wasn't created");
+    }
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory_removeOldDirectory.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory_removeOldDirectory.js
new file mode 100644
index 0000000000..a7beced885
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromIndexedDBDirectory_removeOldDirectory.js
@@ -0,0 +1,86 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that the old directory is removed in
+ * MaybeUpgradeFromIndexedDBDirectoryToPersistentStorageDirectory method.
+ */
+
+async function testSteps() {
+  const url = "http://www.mozilla.org";
+  const persistence = "default";
+
+  const packages = [
+    // Storage used by FF 26-35 (storage/persistent/ directory and re-created
+    // indexedDB directory by an older FF).
+    "indexedDBAndPersistentStorageDirectory_profile",
+    "../persistentStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking directories");
+
+  let indexedDBDir = getRelativeFile("indexedDB");
+  let exists = indexedDBDir.exists();
+  ok(exists, "IndexedDB directory does exist");
+
+  let persistentStorageDir = getRelativeFile("storage/persistent");
+  exists = persistentStorageDir.exists();
+  ok(exists, "Persistent storage directory does exist");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking directories");
+
+  indexedDBDir = getRelativeFile("indexedDB");
+  exists = indexedDBDir.exists();
+  ok(!exists, "IndexedDB directory doesn't exist");
+
+  // FF 36 renamed storage/persistent/ to storage/default/ so it can't exist
+  // either.
+  persistentStorageDir = getRelativeFile("storage/persistent");
+  exists = persistentStorageDir.exists();
+  ok(!exists, "Persistent storage directory doesn't exist");
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing origin");
+
+  request = initTemporaryOrigin(persistence, getPrincipal(url));
+  await requestFinished(request);
+
+  ok(!request.result, "Origin directory wasn't created");
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory.js
new file mode 100644
index 0000000000..20c0152921
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory.js
@@ -0,0 +1,378 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify
+ * MaybeUpgradeFromPersistentStorageDirectoryToDefaultStorageDirectory method.
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+function* testSteps() {
+  const origins = [
+    {
+      oldPath: "storage/persistent/1007+f+app+++system.gaiamobile.org",
+    },
+
+    {
+      oldPath: "storage/persistent/1007+t+https+++developer.cdn.mozilla.net",
+    },
+
+    {
+      oldPath: "storage/persistent/chrome",
+      newPath: "storage/permanent/chrome",
+      chrome: true,
+      persistence: "persistent",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++",
+      newPath: "storage/default/file++++",
+      url: "file:///",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++++index.html",
+      newPath: "storage/default/file++++++index.html",
+      url: "file:///+/index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++++index.html",
+      newPath: "storage/default/file++++++index.html",
+      url: "file://///index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++Users+joe+",
+      newPath: "storage/default/file++++Users+joe+",
+      url: "file:///Users/joe/",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++Users+joe+c+++index.html",
+      newPath: "storage/default/file++++Users+joe+c+++index.html",
+      url: "file:///Users/joe/c++/index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++Users+joe+c+++index.html",
+      newPath: "storage/default/file++++Users+joe+c+++index.html",
+      url: "file:///Users/joe/c///index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++Users+joe+index.html",
+      newPath: "storage/default/file++++Users+joe+index.html",
+      url: "file:///Users/joe/index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++c++",
+      newPath: "storage/default/file++++c++",
+      url: "file:///c:/",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++c++Users+joe+",
+      newPath: "storage/default/file++++c++Users+joe+",
+      url: "file:///c:/Users/joe/",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/file++++c++Users+joe+index.html",
+      newPath: "storage/default/file++++c++Users+joe+index.html",
+      url: "file:///c:/Users/joe/index.html",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/http+++127.0.0.1",
+      newPath: "storage/default/http+++127.0.0.1",
+      url: "http://127.0.0.1",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/http+++localhost",
+      newPath: "storage/default/http+++localhost",
+      url: "http://localhost",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/http+++www.mozilla.org",
+      newPath: "storage/default/http+++www.mozilla.org",
+      url: "http://www.mozilla.org",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/http+++www.mozilla.org+8080",
+      newPath: "storage/default/http+++www.mozilla.org+8080",
+      url: "http://www.mozilla.org:8080",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/https+++www.mozilla.org",
+      newPath: "storage/default/https+++www.mozilla.org",
+      url: "https://www.mozilla.org",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/https+++www.mozilla.org+8080",
+      newPath: "storage/default/https+++www.mozilla.org+8080",
+      url: "https://www.mozilla.org:8080",
+      persistence: "default",
+    },
+
+    {
+      oldPath: "storage/persistent/indexeddb+++fx-devtools",
+      newPath: "storage/permanent/indexeddb+++fx-devtools",
+      url: "indexeddb://fx-devtools",
+      persistence: "persistent",
+    },
+
+    {
+      oldPath: "storage/persistent/moz-safe-about+++home",
+    },
+
+    {
+      oldPath: "storage/persistent/moz-safe-about+home",
+      newPath: "storage/permanent/moz-safe-about+home",
+      url: "moz-safe-about:home",
+      persistence: "persistent",
+    },
+
+    {
+      oldPath:
+        "storage/persistent/resource+++fx-share-addon-at-mozilla-dot-org-fx-share-addon-data",
+      newPath:
+        "storage/permanent/resource+++fx-share-addon-at-mozilla-dot-org-fx-share-addon-data",
+      url: "resource://fx-share-addon-at-mozilla-dot-org-fx-share-addon-data",
+      persistence: "persistent",
+    },
+
+    {
+      oldPath: "storage/temporary/1007+f+app+++system.gaiamobile.org",
+    },
+
+    {
+      oldPath: "storage/temporary/1007+t+https+++developer.cdn.mozilla.net",
+    },
+
+    // The .metadata file was intentionally appended for this origin directory
+    // to test recovery from unfinished upgrades (some metadata files can be
+    // already upgraded).
+    {
+      oldPath: "storage/temporary/chrome",
+      newPath: "storage/temporary/chrome",
+      metadataUpgraded: true,
+      chrome: true,
+      persistence: "temporary",
+    },
+
+    {
+      oldPath: "storage/temporary/http+++localhost",
+      newPath: "storage/temporary/http+++localhost",
+      url: "http://localhost",
+      persistence: "temporary",
+    },
+
+    // The .metadata file was intentionally removed for this origin directory
+    // to test restoring during upgrade.
+    {
+      oldPath: "storage/temporary/http+++localhost+81",
+      newPath: "storage/temporary/http+++localhost+81",
+      metadataRemoved: true,
+      url: "http://localhost:81",
+      persistence: "temporary",
+    },
+
+    // The .metadata file was intentionally truncated for this origin directory
+    // to test restoring during upgrade.
+    {
+      oldPath: "storage/temporary/http+++localhost+82",
+      newPath: "storage/temporary/http+++localhost+82",
+      url: "http://localhost:82",
+      persistence: "temporary",
+    },
+  ];
+
+  const metadataFileName = ".metadata";
+
+  const packages = [
+    // Storage used by 26-35 (storage/persistent/ directory, tracked only
+    // timestamp in .metadata for persistent storage and isApp not tracked in
+    // .metadata for temporary storage).
+    "persistentStorageDirectory_profile",
+    "../persistentStorageDirectory_shared",
+  ];
+
+  let metadataBuffers = [];
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    if (origin.newPath) {
+      info("Reading out contents of metadata file");
+
+      let metadataFile = originDir.clone();
+      metadataFile.append(metadataFileName);
+
+      if (origin.metadataRemoved) {
+        metadataBuffers.push(new ArrayBuffer(0));
+      } else {
+        File.createFromNsIFile(metadataFile).then(grabArgAndContinueHandler);
+        let file = yield undefined;
+
+        let fileReader = new FileReader();
+        fileReader.onload = continueToNextStepSync;
+        fileReader.readAsArrayBuffer(file);
+
+        yield undefined;
+
+        metadataBuffers.push(fileReader.result);
+      }
+
+      if (origin.newPath != origin.oldPath) {
+        originDir = getRelativeFile(origin.newPath);
+        exists = originDir.exists();
+        ok(!exists, "Origin directory doesn't exist");
+      }
+    }
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    if (!origin.newPath || origin.newPath != origin.oldPath) {
+      let originDir = getRelativeFile(origin.oldPath);
+      let exists = originDir.exists();
+      ok(!exists, "Origin directory doesn't exist");
+    }
+
+    if (origin.newPath) {
+      let originDir = getRelativeFile(origin.newPath);
+      let exists = originDir.exists();
+      ok(exists, "Origin directory does exist");
+
+      info("Reading out contents of metadata file");
+
+      let metadataFile = originDir.clone();
+      metadataFile.append(metadataFileName);
+
+      File.createFromNsIFile(metadataFile).then(grabArgAndContinueHandler);
+      let file = yield undefined;
+
+      let fileReader = new FileReader();
+      fileReader.onload = continueToNextStepSync;
+      fileReader.readAsArrayBuffer(file);
+
+      yield undefined;
+
+      let metadataBuffer = fileReader.result;
+
+      info("Verifying blobs differ");
+
+      if (origin.metadataUpgraded) {
+        ok(
+          compareBuffers(metadataBuffer, metadataBuffers.shift()),
+          "Metadata doesn't differ"
+        );
+      } else {
+        ok(
+          !compareBuffers(metadataBuffer, metadataBuffers.shift()),
+          "Metadata differ"
+        );
+      }
+    }
+  }
+
+  info("Initializing");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    if (origin.newPath) {
+      info("Initializing origin");
+
+      let principal;
+      if (origin.chrome) {
+        principal = getCurrentPrincipal();
+      } else {
+        principal = getPrincipal(origin.url);
+      }
+
+      if (origin.persistence == "persistent") {
+        request = initPersistentOrigin(principal, continueToNextStepSync);
+      } else {
+        request = initTemporaryOrigin(
+          origin.persistence,
+          principal,
+          continueToNextStepSync
+        );
+      }
+      yield undefined;
+
+      Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+      ok(!request.result, "Origin directory wasn't created");
+    }
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_removeOldDirectory.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_removeOldDirectory.js
new file mode 100644
index 0000000000..524104b776
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_removeOldDirectory.js
@@ -0,0 +1,102 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that the old directory is removed in
+ * MaybeUpgradeFromPersistentStorageDirectoryToDefaultStorageDirectory method.
+ */
+
+async function testSteps() {
+  const url = "http://www.mozilla.org";
+  const persistence = "default";
+  const lastAccessed = 0x0005330925e07841;
+
+  const packages = [
+    // Storage used by FF 36-48 (storage/default/ directory and re-created
+    // storage/persistent/ directory by an older FF).
+    "persistentAndDefaultStorageDirectory_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking directories");
+
+  let persistentStorageDir = getRelativeFile("storage/persistent");
+  let exists = persistentStorageDir.exists();
+  ok(exists, "Persistent storage directory does exist");
+
+  let defaultStorageDir = getRelativeFile("storage/default");
+  exists = defaultStorageDir.exists();
+  ok(exists, "Default storage directory does exist");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization and getting
+  //       usage is able to ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/permanent/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking directories");
+
+  persistentStorageDir = getRelativeFile("storage/persistent");
+  exists = persistentStorageDir.exists();
+  ok(!exists, "Persistent storage directory doesn't exist");
+
+  defaultStorageDir = getRelativeFile("storage/default");
+  exists = defaultStorageDir.exists();
+  ok(exists, "Default storage directory does exist");
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage();
+  await requestFinished(request);
+
+  info("Initializing origin");
+
+  request = initTemporaryOrigin(persistence, getPrincipal(url));
+  await requestFinished(request);
+
+  ok(!request.result, "Origin directory wasn't created");
+
+  info("Getting usage");
+
+  request = getUsage(function () {}, /* getAll */ true);
+  await requestFinished(request);
+
+  info("Verifying result");
+
+  const result = request.result;
+  is(result.length, 1, "Correct number of usage results");
+
+  info("Verifying usage result");
+
+  const usageResult = result[0];
+  Assert.equal(usageResult.origin, url, "Origin equals");
+  Assert.equal(usageResult.lastAccessed, lastAccessed, "LastAccessed equals");
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_upgradeOriginDirectories.js b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_upgradeOriginDirectories.js
new file mode 100644
index 0000000000..6965a95e69
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeFromPersistentStorageDirectory_upgradeOriginDirectories.js
@@ -0,0 +1,162 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function* testSteps() {
+  const origins = [
+    {
+      oldPath: "storage/persistent/1007+f+app+++system.gaiamobile.org",
+      upgraded: true,
+    },
+
+    {
+      oldPath: "storage/persistent/1007+t+https+++developer.cdn.mozilla.net",
+      upgraded: true,
+    },
+
+    {
+      oldPath: "storage/persistent/http+++www.mozilla.org",
+      newPath: "storage/default/http+++www.mozilla.org",
+      url: "http://www.mozilla.org",
+      persistence: "default",
+      upgraded: true,
+    },
+    {
+      oldPath: "storage/persistent/http+++www.mozilla.org+8080",
+      newPath: "storage/default/http+++www.mozilla.org+8080",
+      url: "http://www.mozilla.org:8080",
+      persistence: "default",
+    },
+  ];
+
+  const metadataFileName = ".metadata";
+
+  const packages = [
+    // Storage used by FF 26-35 (storage/persistent/ directory with already
+    // upgraded origin directories and not yet upgraded flat origin
+    // directories).
+    "persistentStorageDirectory_originDirectories_profile",
+    "../persistentStorageDirectory_shared",
+  ];
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking origin directories");
+
+  for (const origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    let idbDir = originDir.clone();
+    idbDir.append("idb");
+
+    exists = idbDir.exists();
+    if (origin.upgraded) {
+      ok(exists, "idb directory does exist");
+    } else {
+      ok(!exists, "idb directory doesn't exist");
+    }
+
+    let metadataFile = originDir.clone();
+    metadataFile.append(metadataFileName);
+
+    exists = metadataFile.exists();
+    if (origin.upgraded) {
+      ok(exists, "Metadata file does exist");
+    } else {
+      ok(!exists, "Metadata file doesn't exist");
+    }
+
+    if (origin.newPath) {
+      originDir = getRelativeFile(origin.newPath);
+      exists = originDir.exists();
+      ok(!exists, "Origin directory doesn't exist");
+    }
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization and getting
+  //       usage is able to ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking origin directories");
+
+  for (const origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(!exists, "Origin directory doesn't exist");
+
+    if (origin.newPath) {
+      originDir = getRelativeFile(origin.newPath);
+      exists = originDir.exists();
+      ok(exists, "Origin directory does exist");
+
+      let idbDir = originDir.clone();
+      idbDir.append("idb");
+
+      exists = idbDir.exists();
+      ok(exists, "idb directory does exist");
+
+      let metadataFile = originDir.clone();
+      metadataFile.append(metadataFileName);
+
+      exists = metadataFile.exists();
+      ok(exists, "Metadata file does exist");
+    }
+  }
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    if (origin.newPath) {
+      info("Initializing origin");
+
+      let principal = getPrincipal(origin.url);
+      request = initTemporaryOrigin(
+        origin.persistence,
+        principal,
+        continueToNextStepSync
+      );
+      yield undefined;
+
+      Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+      ok(!request.result, "Origin directory wasn't created");
+    }
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom0_0.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom0_0.js
new file mode 100644
index 0000000000..f1e97ab043
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom0_0.js
@@ -0,0 +1,158 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify UpgradeStorageFrom0_0To1_0 method.
+ */
+
+function* testSteps() {
+  const origins = [
+    {
+      path: "storage/default/1007+f+app+++system.gaiamobile.org",
+      obsolete: true,
+    },
+
+    {
+      path: "storage/default/1007+t+https+++developer.cdn.mozilla.net",
+      obsolete: true,
+    },
+
+    {
+      path: "storage/default/http+++www.mozilla.org",
+      obsolete: false,
+      url: "http://www.mozilla.org",
+      persistence: "default",
+    },
+  ];
+
+  const storageFileName = "storage.sqlite";
+  const metadataFileName = ".metadata";
+  const metadata2FileName = ".metadata-v2";
+
+  const packages = [
+    // Storage used by FF 36-48 (storage/default/ directory, but no
+    // storage.sqlite and no .metadata-v2 files).
+    "version0_0_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking storage file");
+
+  let storageFile = getRelativeFile(storageFileName);
+
+  let exists = storageFile.exists();
+  ok(!exists, "Storage file doesn't exist");
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.path);
+
+    exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    let metadataFile = originDir.clone();
+    metadataFile.append(metadataFileName);
+
+    exists = metadataFile.exists();
+    ok(exists, "Metadata file does exist");
+
+    let metadata2File = originDir.clone();
+    metadata2File.append(metadata2FileName);
+
+    exists = metadata2File.exists();
+    ok(!exists, "Metadata file doesn't exist");
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  exists = storageFile.exists();
+  ok(exists, "Storage file does exist");
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.path);
+
+    exists = originDir.exists();
+    if (origin.obsolete) {
+      ok(!exists, "Origin directory doesn't exist");
+    } else {
+      ok(exists, "Origin directory does exist");
+
+      let metadataFile = originDir.clone();
+      metadataFile.append(metadataFileName);
+
+      exists = metadataFile.exists();
+      ok(exists, "Metadata file does exist");
+
+      let metadata2File = originDir.clone();
+      metadata2File.append(metadata2FileName);
+
+      exists = metadata2File.exists();
+      ok(exists, "Metadata file does exist");
+    }
+  }
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    if (!origin.obsolete) {
+      info("Initializing origin");
+
+      let principal = getPrincipal(origin.url);
+      request = initTemporaryOrigin(
+        origin.persistence,
+        principal,
+        continueToNextStepSync
+      );
+      yield undefined;
+
+      Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+      ok(!request.result, "Origin directory wasn't created");
+    }
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_idb.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_idb.js
new file mode 100644
index 0000000000..34508f85e8
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_idb.js
@@ -0,0 +1,43 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify indexedDB::QuotaClient::UpgradeStorageFrom1_0To2_0
+ * method.
+ */
+
+async function testSteps() {
+  const packages = [
+    // Storage used by FF 49-54 (storage version 1.0 with idb directory).
+    "version1_0_idb_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Initializing");
+
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeAppsData.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeAppsData.js
new file mode 100644
index 0000000000..c3589ee686
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeAppsData.js
@@ -0,0 +1,100 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify MaybeRemoveAppsData method.
+ */
+
+function* testSteps() {
+  const origins = [
+    {
+      path: "storage/default/http+++www.mozilla.org",
+      obsolete: false,
+    },
+
+    {
+      path: "storage/default/app+++system.gaiamobile.org^appId=1007",
+      obsolete: true,
+    },
+
+    {
+      path: "storage/default/https+++developer.cdn.mozilla.net^appId=1007&inBrowser=1",
+      obsolete: true,
+    },
+  ];
+
+  const packages = [
+    // Storage used by FF 49-54 (storage version 1.0 with apps data).
+    "version1_0_appsData_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.path);
+
+    let exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once getting usage is able to ignore unknown
+  //       directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/permanent/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.path);
+
+    let exists = originDir.exists();
+    if (origin.obsolete) {
+      ok(!exists, "Origin directory doesn't exist");
+    } else {
+      ok(exists, "Origin directory does exist");
+    }
+  }
+
+  info("Getting usage");
+
+  getUsage(grabResultAndContinueHandler, /* getAll */ true);
+  let result = yield undefined;
+
+  info("Verifying result");
+
+  is(result.length, 1, "Correct number of usage results");
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeMorgueDirectory.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeMorgueDirectory.js
new file mode 100644
index 0000000000..b58f170d52
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_removeMorgueDirectory.js
@@ -0,0 +1,60 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify MaybeRemoveMorgueDirectory method.
+ */
+
+function* testSteps() {
+  const morgueFile = "storage/default/http+++example.com/morgue";
+
+  const packages = [
+    // Storage used by FF 49-54 (storage version 1.0 with morgue directory).
+    "version1_0_morgueDirectory_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking morgue file");
+
+  let file = getRelativeFile(morgueFile);
+
+  let exists = file.exists();
+  ok(exists, "Morgue file does exist");
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  info("Checking morgue file");
+
+  exists = file.exists();
+  ok(!exists, "Morgue file doesn't exist");
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_stripObsoleteOriginAttributes.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_stripObsoleteOriginAttributes.js
new file mode 100644
index 0000000000..b0706d3640
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom1_0_stripObsoleteOriginAttributes.js
@@ -0,0 +1,179 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify MaybeStripObsoleteOriginAttributes method.
+ */
+
+loadScript("dom/quota/test/common/file.js");
+
+function* testSteps() {
+  const origins = [
+    {
+      oldPath:
+        "storage/permanent/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+      newPath:
+        "storage/permanent/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+      url: "moz-extension://8ea6d31b-917c-431f-a204-15b95e904d4f",
+      persistence: "persistent",
+    },
+
+    {
+      oldPath:
+        "storage/temporary/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+      newPath:
+        "storage/temporary/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+      url: "moz-extension://8ea6d31b-917c-431f-a204-15b95e904d4f",
+      persistence: "temporary",
+    },
+
+    {
+      oldPath:
+        "storage/default/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+      newPath:
+        "storage/default/moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+      url: "moz-extension://8ea6d31b-917c-431f-a204-15b95e904d4f",
+      persistence: "default",
+    },
+  ];
+
+  const metadataFileName = ".metadata-v2";
+
+  const packages = [
+    // Storage used by FF 49-54 (storage version 1.0 with obsolete origin
+    // attributes).
+    "version1_0_obsoleteOriginAttributes_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  let metadataBuffers = [];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    info("Reading out contents of metadata file");
+
+    let metadataFile = originDir.clone();
+    metadataFile.append(metadataFileName);
+
+    File.createFromNsIFile(metadataFile).then(grabArgAndContinueHandler);
+    let file = yield undefined;
+
+    let fileReader = new FileReader();
+    fileReader.onload = continueToNextStepSync;
+    fileReader.readAsArrayBuffer(file);
+
+    yield undefined;
+
+    metadataBuffers.push(fileReader.result);
+
+    originDir = getRelativeFile(origin.newPath);
+    exists = originDir.exists();
+    ok(!exists, "Origin directory doesn't exist");
+  }
+
+  info("Initializing");
+
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  // TODO: Remove this block once temporary storage initialization is able to
+  //       ignore unknown directories.
+  getRelativeFile("storage/default/invalid+++example.com").remove(false);
+  getRelativeFile("storage/temporary/invalid+++example.com").remove(false);
+
+  info("Checking origin directories");
+
+  for (let origin of origins) {
+    let originDir = getRelativeFile(origin.oldPath);
+    let exists = originDir.exists();
+    ok(!exists, "Origin directory doesn't exist");
+
+    originDir = getRelativeFile(origin.newPath);
+    exists = originDir.exists();
+    ok(exists, "Origin directory does exist");
+
+    info("Reading out contents of metadata file");
+
+    let metadataFile = originDir.clone();
+    metadataFile.append(metadataFileName);
+
+    File.createFromNsIFile(metadataFile).then(grabArgAndContinueHandler);
+    let file = yield undefined;
+
+    let fileReader = new FileReader();
+    fileReader.onload = continueToNextStepSync;
+    fileReader.readAsArrayBuffer(file);
+
+    yield undefined;
+
+    let metadataBuffer = fileReader.result;
+
+    info("Verifying blobs differ");
+
+    ok(
+      !compareBuffers(metadataBuffer, metadataBuffers.shift()),
+      "Metadata differ"
+    );
+  }
+
+  info("Initializing temporary storage");
+
+  request = initTemporaryStorage(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Initializing origins");
+
+  for (const origin of origins) {
+    info("Initializing origin");
+
+    let principal = getPrincipal(origin.url);
+    if (origin.persistence == "persistent") {
+      request = initPersistentOrigin(principal, continueToNextStepSync);
+    } else {
+      request = initTemporaryOrigin(
+        origin.persistence,
+        principal,
+        continueToNextStepSync
+      );
+    }
+    yield undefined;
+
+    Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+    ok(!request.result, "Origin directory wasn't created");
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_0.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_0.js
new file mode 100644
index 0000000000..f161820a8f
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_0.js
@@ -0,0 +1,97 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify UpgradeStorageFrom2_0To2_1 method.
+ */
+
+function* testSteps() {
+  const origins = [
+    "storage/default/chrome/",
+    "storage/default/http+++www.mozilla.org/",
+  ];
+  const paddingFilePath = "cache/.padding";
+
+  const packages = [
+    // Storage used by FF 55-56 (storage version 2.0).
+    // The profile contains two cache storages:
+    // - storage/default/chrome/cache,
+    // - storage/default/http+++www.mozilla.org/cache
+    // The file create_cache.js in the package was run locally, specifically it
+    // was temporarily added to xpcshell.ini and then executed:
+    //   mach xpcshell-test --interactive dom/quota/test/xpcshell/create_cache.js
+    // Note: it only creates the directory "storage/default/chrome/cache".
+    // To make it become the profile in the test, two more manual steps are
+    // needed.
+    // 1. Remove the folder "storage/temporary".
+    // 2. Copy the content under the "storage/default/chrome" to
+    //    "storage/default/http+++www.mozilla.org".
+    // 3. Manually create an asmjs folder under the
+    //    "storage/default/http+++www.mozilla.org/".
+    "version2_0_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  clear(continueToNextStepSync);
+  yield undefined;
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking padding files before upgrade (storage version 2.0)");
+
+  for (let origin of origins) {
+    let paddingFile = getRelativeFile(origin + paddingFilePath);
+    let exists = paddingFile.exists();
+    ok(!exists, "Padding file doesn't exist");
+  }
+
+  info("Initializing");
+
+  // Initialize to trigger storage upgrade from version 2.0.
+  let request = init(continueToNextStepSync);
+  yield undefined;
+
+  Assert.equal(request.resultCode, NS_OK, "Initialization succeeded");
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  info("Checking padding files after upgrade");
+
+  for (let origin of origins) {
+    let paddingFile = getRelativeFile(origin + paddingFilePath);
+    let exists = paddingFile.exists();
+    ok(exists, "Padding file does exist");
+
+    info("Reading out contents of padding file");
+
+    File.createFromNsIFile(paddingFile).then(grabArgAndContinueHandler);
+    let domFile = yield undefined;
+
+    let fileReader = new FileReader();
+    fileReader.onload = continueToNextStepSync;
+    fileReader.readAsArrayBuffer(domFile);
+    yield undefined;
+
+    let paddingFileInfo = new Float64Array(fileReader.result);
+    Assert.equal(paddingFileInfo.length, 1, "Padding file does take 64 bytes.");
+    Assert.equal(paddingFileInfo[0], 0, "Padding size does default to zero.");
+  }
+
+  finishTest();
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_1.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_1.js
new file mode 100644
index 0000000000..eed7ed21d5
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_1.js
@@ -0,0 +1,85 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify UpgradeStorageFrom2_1To2_2 method (removal of
+ * obsolete origins, deprecated clients and unknown temporary files).
+ */
+
+async function testSteps() {
+  const filePaths = [
+    // Obsolete origins:
+    "storage/default/chrome+++content+browser.xul",
+
+    "storage/default/moz-safe-about+++home",
+
+    // TODO: These three origins don't belong here! They were added one release
+    //       later and the origin parser was fixed to handle these origins one
+    //       release later as well, so users which already upgraded to 2.2 may
+    //       still have issues related to these origins!
+    "storage/default/about+home+1",
+
+    "storage/default/about+home+1+q",
+
+    // about:reader?url=xxx (before bug 1422456)
+    "storage/default/about+reader+url=https%3A%2F%2Fexample.com",
+
+    // Deprecated client:
+    "storage/default/https+++example.com/asmjs",
+
+    // Unknown temporary file:
+    "storage/default/https+++example.com/idb/UUID123.tmp",
+  ];
+
+  const packages = [
+    // Storage used by FF 57-67 (storage version 2.1 with obsolete origins, a
+    // deprecated client and an unknown temporary file).
+    "version2_1_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  info("Checking files and directories before upgrade (storage version 2.1)");
+
+  for (const filePath of filePaths) {
+    let file = getRelativeFile(filePath);
+    let exists = file.exists();
+    ok(exists, "File or directory does exist");
+  }
+
+  info("Initializing");
+
+  // Initialize to trigger storage upgrade from version 2.1
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  info("Checking files and directories after upgrade");
+
+  for (const filePath of filePaths) {
+    let file = getRelativeFile(filePath);
+    let exists = file.exists();
+    ok(!exists, "File or directory does not exist");
+  }
+}
diff --git a/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_2.js b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_2.js
new file mode 100644
index 0000000000..8f41c05b49
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/test_upgradeStorageFrom2_2.js
@@ -0,0 +1,64 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify UpgradeStorageFrom2_2To2_3 method.
+ */
+
+async function testSteps() {
+  const packages = [
+    // Storage used by FF 68-69 (storage version 2.2).
+    "version2_2_profile",
+    "../defaultStorageDirectory_shared",
+  ];
+
+  function verifyDatabaseTable(shouldExist) {
+    let file = getRelativeFile("storage.sqlite");
+    let conn = Services.storage.openUnsharedDatabase(file);
+
+    let exists = conn.tableExists("database");
+    if (shouldExist) {
+      ok(exists, "Database table does exist");
+    } else {
+      ok(!exists, "Database table does not exist");
+    }
+
+    conn.close();
+  }
+
+  info("Clearing");
+
+  let request = clear();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "beforeInstall");
+
+  info("Installing packages");
+
+  installPackages(packages);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInstall");
+
+  verifyDatabaseTable(/* shouldExist */ false);
+
+  info("Initializing");
+
+  // Initialize to trigger storage upgrade from version 2.2
+  request = init();
+  await requestFinished(request);
+
+  info("Verifying storage");
+
+  verifyStorage(packages, "afterInit");
+
+  request = reset();
+  await requestFinished(request);
+
+  verifyDatabaseTable(/* shouldExist */ true);
+}
diff --git a/dom/quota/test/xpcshell/upgrades/version0_0_profile.json b/dom/quota/test/xpcshell/upgrades/version0_0_profile.json
new file mode 100644
index 0000000000..05c0d27fe3
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version0_0_profile.json
@@ -0,0 +1,88 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "1007+f+app+++system.gaiamobile.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "1007+t+https+++developer.cdn.mozilla.org",
+                "dir": true,
+                "entries": [{ "name": ".metadata", "dir": false }]
+              },
+              {
+                "name": "https+++developer.cdn.mozilla.org",
+                "dir": true
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "todo": "This shouldn't exist, it regressed after accidental changes done in bug 1320404",
+                "name": "https+++developer.cdn.mozilla.net",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "https+++developer.cdn.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version0_0_profile.zip b/dom/quota/test/xpcshell/upgrades/version0_0_profile.zip
new file mode 100644
index 0000000000..5ef577191c
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version0_0_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.json b/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.json
new file mode 100644
index 0000000000..88f5d5dcee
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.json
@@ -0,0 +1,72 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "app+++system.gaiamobile.org^appId=1007",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "https+++developer.cdn.mozilla.net^appId=1007&inBrowser=1",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.zip b/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.zip
new file mode 100644
index 0000000000..582edb43af
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_appsData_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.json b/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.json
new file mode 100644
index 0000000000..9f3b53f57d
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.json
@@ -0,0 +1,73 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-safe-about+home",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "idb",
+                    "dir": true,
+                    "entries": [
+                      { "name": "631132235dGb", "dir": true },
+                      { "name": "631132235dGb.files", "dir": true },
+                      { "name": "631132235dGb.sqlite", "dir": false }
+                    ]
+                  },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-safe-about+home",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "idb",
+                    "dir": true,
+                    "entries": [
+                      { "name": "631132235dGb.files", "dir": true },
+                      { "name": "631132235dGb.sqlite", "dir": false }
+                    ]
+                  },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.zip b/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.zip
new file mode 100644
index 0000000000..8abfae79c2
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_idb_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.json b/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.json
new file mode 100644
index 0000000000..855f7846bc
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.json
@@ -0,0 +1,57 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "morgue", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "http+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.zip b/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.zip
new file mode 100644
index 0000000000..88543784ec
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_morgueDirectory_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.json b/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.json
new file mode 100644
index 0000000000..071c4413f4
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.json
@@ -0,0 +1,112 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f^addonId=indexedDB-test%40kmaglione.mozilla.com",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "permanent",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          {
+            "name": "temporary",
+            "dir": true,
+            "entries": [
+              {
+                "name": "moz-extension+++8ea6d31b-917c-431f-a204-15b95e904d4f",
+                "dir": true,
+                "entries": [
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.zip b/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.zip
new file mode 100644
index 0000000000..2b4125edf9
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version1_0_obsoleteOriginAttributes_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version2_0_profile.json b/dom/quota/test/xpcshell/upgrades/version2_0_profile.json
new file mode 100644
index 0000000000..04ad73eae3
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_0_profile.json
@@ -0,0 +1,105 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [
+                      { "name": "morgue", "dir": true },
+                      { "name": "caches.sqlite", "dir": false }
+                    ]
+                  },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  { "name": "asmjs", "dir": true },
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [
+                      { "name": "morgue", "dir": true },
+                      { "name": "caches.sqlite", "dir": false }
+                    ]
+                  }
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "chrome",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [
+                      { "name": "morgue", "dir": true },
+                      { "name": ".padding", "dir": false },
+                      { "name": "caches.sqlite", "dir": false }
+                    ]
+                  },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              },
+              {
+                "name": "http+++www.mozilla.org",
+                "dir": true,
+                "entries": [
+                  {
+                    "name": "cache",
+                    "dir": true,
+                    "entries": [
+                      { "name": "morgue", "dir": true },
+                      { "name": ".padding", "dir": false },
+                      { "name": "caches.sqlite", "dir": false }
+                    ]
+                  },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version2_0_profile.zip b/dom/quota/test/xpcshell/upgrades/version2_0_profile.zip
new file mode 100644
index 0000000000..c140df56e4
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_0_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version2_1_profile.json b/dom/quota/test/xpcshell/upgrades/version2_1_profile.json
new file mode 100644
index 0000000000..a7866d1123
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_1_profile.json
@@ -0,0 +1,69 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              { "name": "about+home+1", "dir": true },
+              { "name": "about+home+1+q", "dir": true },
+              {
+                "name": "about+reader+url=https%3A%2F%2Fexample.com",
+                "dir": true
+              },
+              { "name": "chrome+++content+browser.xul", "dir": true },
+              {
+                "name": "https+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "asmjs", "dir": true },
+                  {
+                    "name": "idb",
+                    "dir": true,
+                    "entries": [{ "name": "UUID123.tmp", "dir": false }]
+                  }
+                ]
+              },
+              { "name": "moz-safe-about+++home", "dir": true }
+            ]
+          }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [
+          {
+            "name": "default",
+            "dir": true,
+            "entries": [
+              {
+                "name": "https+++example.com",
+                "dir": true,
+                "entries": [
+                  { "name": "idb", "dir": true },
+                  { "name": ".metadata", "dir": false },
+                  { "name": ".metadata-v2", "dir": false }
+                ]
+              }
+            ]
+          },
+          { "name": "ls-archive.sqlite", "dir": false }
+        ]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version2_1_profile.zip b/dom/quota/test/xpcshell/upgrades/version2_1_profile.zip
new file mode 100644
index 0000000000..908dac7058
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_1_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/version2_2_profile.json b/dom/quota/test/xpcshell/upgrades/version2_2_profile.json
new file mode 100644
index 0000000000..4b7265e3b4
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_2_profile.json
@@ -0,0 +1,18 @@
+[
+  { "key": "beforeInstall", "entries": [] },
+  {
+    "key": "afterInstall",
+    "entries": [{ "name": "storage.sqlite", "dir": false }]
+  },
+  {
+    "key": "afterInit",
+    "entries": [
+      {
+        "name": "storage",
+        "dir": true,
+        "entries": [{ "name": "ls-archive.sqlite", "dir": false }]
+      },
+      { "name": "storage.sqlite", "dir": false }
+    ]
+  }
+]
diff --git a/dom/quota/test/xpcshell/upgrades/version2_2_profile.zip b/dom/quota/test/xpcshell/upgrades/version2_2_profile.zip
new file mode 100644
index 0000000000..b6ae7e7d76
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/version2_2_profile.zip
diff --git a/dom/quota/test/xpcshell/upgrades/xpcshell.toml b/dom/quota/test/xpcshell/upgrades/xpcshell.toml
new file mode 100644
index 0000000000..2b771f619f
--- /dev/null
+++ b/dom/quota/test/xpcshell/upgrades/xpcshell.toml
@@ -0,0 +1,75 @@
+[DEFAULT]
+head = "head.js"
+support-files = [
+  "cacheVersion1_profile.json",
+  "cacheVersion1_profile.zip",
+  "indexedDBAndPersistentStorageDirectory_profile.json",
+  "indexedDBAndPersistentStorageDirectory_profile.zip",
+  "indexedDBDirectory_flatOriginDirectories_profile.json",
+  "indexedDBDirectory_flatOriginDirectories_profile.zip",
+  "indexedDBDirectory_profile.json",
+  "indexedDBDirectory_profile.zip",
+  "localStorageArchive1upgrade_profile.zip",
+  "localStorageArchive4upgrade_profile.zip",
+  "localStorageArchiveDowngrade_profile.zip",
+  "persistentAndDefaultStorageDirectory_profile.json",
+  "persistentAndDefaultStorageDirectory_profile.zip",
+  "persistentStorageDirectory_flatOriginDirectories_profile.json",
+  "persistentStorageDirectory_flatOriginDirectories_profile.zip",
+  "persistentStorageDirectory_originDirectories_profile.json",
+  "persistentStorageDirectory_originDirectories_profile.zip",
+  "persistentStorageDirectory_profile.json",
+  "persistentStorageDirectory_profile.zip",
+  "version0_0_profile.json",
+  "version0_0_profile.zip",
+  "version1_0_appsData_profile.json",
+  "version1_0_appsData_profile.zip",
+  "version1_0_idb_profile.json",
+  "version1_0_idb_profile.zip",
+  "version1_0_morgueDirectory_profile.json",
+  "version1_0_morgueDirectory_profile.zip",
+  "version1_0_obsoleteOriginAttributes_profile.json",
+  "version1_0_obsoleteOriginAttributes_profile.zip",
+  "version2_0_profile.json",
+  "version2_0_profile.zip",
+  "version2_1_profile.json",
+  "version2_1_profile.zip",
+  "version2_2_profile.json",
+  "version2_2_profile.zip",
+]
+
+["test_localStorageArchive1upgrade.js"]
+
+["test_localStorageArchive4upgrade.js"]
+
+["test_localStorageArchiveDowngrade.js"]
+
+["test_upgradeCacheFrom1.js"]
+
+["test_upgradeFromFlatOriginDirectories.js"]
+
+["test_upgradeFromIndexedDBDirectory.js"]
+
+["test_upgradeFromIndexedDBDirectory_removeOldDirectory.js"]
+
+["test_upgradeFromPersistentStorageDirectory.js"]
+
+["test_upgradeFromPersistentStorageDirectory_removeOldDirectory.js"]
+
+["test_upgradeFromPersistentStorageDirectory_upgradeOriginDirectories.js"]
+
+["test_upgradeStorageFrom0_0.js"]
+
+["test_upgradeStorageFrom1_0_idb.js"]
+
+["test_upgradeStorageFrom1_0_removeAppsData.js"]
+
+["test_upgradeStorageFrom1_0_removeMorgueDirectory.js"]
+
+["test_upgradeStorageFrom1_0_stripObsoleteOriginAttributes.js"]
+
+["test_upgradeStorageFrom2_0.js"]
+
+["test_upgradeStorageFrom2_1.js"]
+
+["test_upgradeStorageFrom2_2.js"]
diff --git a/dom/quota/test/xpcshell/xpcshell.toml b/dom/quota/test/xpcshell/xpcshell.toml
new file mode 100644
index 0000000000..736a2c2e1e
--- /dev/null
+++ b/dom/quota/test/xpcshell/xpcshell.toml
@@ -0,0 +1,100 @@
+[DEFAULT]
+head = "head.js"
+tags = "condprof"
+support-files = [
+  "basics_profile.zip",
+  "clearStoragesForOriginPrefix_profile.json",
+  "clearStoragesForOriginPrefix_profile.zip",
+  "clearStoragesForPrincipal_profile.zip",
+  "clearStoragesForPrivateBrowsing_profile.json",
+  "clearStoragesForPrivateBrowsing_profile.zip",
+  "createLocalStorage_profile.zip",
+  "defaultStorageDirectory_shared.json",
+  "defaultStorageDirectory_shared.zip",
+  "getUsage_profile.zip",
+  "groupMismatch_profile.zip",
+  "indexedDBDirectory_shared.json",
+  "indexedDBDirectory_shared.zip",
+  "originMismatch_profile.json",
+  "originMismatch_profile.zip",
+  "persistentStorageDirectory_shared.json",
+  "persistentStorageDirectory_shared.zip",
+  "removeLocalStorage1_profile.zip",
+  "removeLocalStorage2_profile.zip",
+  "tempMetadataCleanup_profile.zip",
+  "unknownFiles_profile.zip",
+]
+
+["make_unknownFiles.js"]
+skip-if = ["true"] # Only used for recreating unknownFiles_profile.zip
+
+["make_unsetLastAccessTime.js"]
+skip-if = ["true"] # Only used for recreating unsetLastAccessTime_profile.zip
+
+["test_allowListFiles.js"]
+
+["test_bad_origin_directory.js"]
+
+["test_basics.js"]
+
+["test_clearStoragesForOriginAttributesPattern.js"]
+
+["test_clearStoragesForOriginPrefix.js"]
+
+["test_clearStoragesForPrincipal.js"]
+
+["test_clearStoragesForPrivateBrowsing.js"]
+
+["test_createLocalStorage.js"]
+
+["test_estimateOrigin.js"]
+
+["test_getUsage.js"]
+
+["test_groupMismatch.js"]
+skip-if = ["true"] # The group is now always empty, so metadata can't differ anymore.
+
+["test_initTemporaryStorage.js"]
+skip-if = ["condprof"] # frequent perma fail, then goes away.
+
+["test_initializePersistentClient.js"]
+
+["test_initializeTemporaryClient.js"]
+
+["test_listOrigins.js"]
+
+["test_originEndsWithDot.js"]
+
+["test_originMismatch.js"]
+
+["test_originWithCaret.js"]
+
+["test_orpahnedQuotaObject.js"]
+
+["test_persist.js"]
+
+["test_persist_eviction.js"]
+
+["test_persist_globalLimit.js"]
+
+["test_persist_groupLimit.js"]
+
+["test_removeLocalStorage.js"]
+
+["test_simpledb.js"]
+
+["test_specialOrigins.js"]
+
+["test_storagePressure.js"]
+skip-if = ["condprof"]
+
+["test_tempMetadataCleanup.js"]
+
+["test_unaccessedOrigins.js"]
+
+["test_unknownFiles.js"]
+
+["test_unsetLastAccessTime.js"]
+support-files = ["unsetLastAccessTime_profile.zip"]
+
+["test_validOrigins.js"]