Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

23 files changed, 1124 insertions, 0 deletions

diff --git a/toolkit/mozapps/downloads/tests/browser/browser.ini b/toolkit/mozapps/downloads/tests/browser/browser.ini
new file mode 100644
index 0000000000..da1cf956e0
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser.ini
@@ -0,0 +1,24 @@
+[DEFAULT]
+support-files =
+  unknownContentType_dialog_layout_data.pif
+  unknownContentType_dialog_layout_data.pif^headers^
+  unknownContentType_dialog_layout_data.txt
+  unknownContentType_dialog_layout_data.txt^headers^
+  head.js
+
+[browser_save_wrongextension.js]
+[browser_unknownContentType_blob.js]
+[browser_unknownContentType_delayedbutton.js]
+skip-if =
+  os == "linux" && bits == 64 && debug # Bug 1747285
+  os == "linux" && fission && tsan # Bug 1747285
+[browser_unknownContentType_dialog_layout.js]
+[browser_unknownContentType_extension.js]
+support-files =
+  unknownContentType.EXE
+  unknownContentType.EXE^headers^
+[browser_unknownContentType_policy.js]
+skip-if = os != 'win' # jnlp file are not considered executable on macOS or Linux
+support-files =
+  example.jnlp
+  example.jnlp^headers^
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_save_wrongextension.js b/toolkit/mozapps/downloads/tests/browser/browser_save_wrongextension.js
new file mode 100644
index 0000000000..ba1b6cde5c
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_save_wrongextension.js
@@ -0,0 +1,98 @@
+/* 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/. */
+
+"use strict";
+
+let url =
+  "data:text/html,<a id='link' href='http://localhost:8000/thefile.js'>Link</a>";
+
+let MockFilePicker = SpecialPowers.MockFilePicker;
+MockFilePicker.init(window);
+
+let httpServer = null;
+
+add_task(async function test() {
+  const { HttpServer } = ChromeUtils.import(
+    "resource://testing-common/httpd.js"
+  );
+
+  httpServer = new HttpServer();
+  httpServer.start(8000);
+
+  function handleRequest(aRequest, aResponse) {
+    aResponse.setStatusLine(aRequest.httpVersion, 200);
+    aResponse.setHeader("Content-Type", "text/plain");
+    aResponse.write("Some Text");
+  }
+  httpServer.registerPathHandler("/thefile.js", handleRequest);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+
+  let popupShownPromise = BrowserTestUtils.waitForEvent(document, "popupshown");
+
+  await BrowserTestUtils.synthesizeMouseAtCenter(
+    "#link",
+    { type: "contextmenu", button: 2 },
+    gBrowser.selectedBrowser
+  );
+  await popupShownPromise;
+
+  let tempDir = createTemporarySaveDirectory();
+  let destFile;
+
+  MockFilePicker.displayDirectory = tempDir;
+  MockFilePicker.showCallback = fp => {
+    let fileName = fp.defaultString;
+    destFile = tempDir.clone();
+    destFile.append(fileName);
+
+    MockFilePicker.setFiles([destFile]);
+    MockFilePicker.filterIndex = 1; // kSaveAsType_URL
+  };
+
+  let transferCompletePromise = new Promise(resolve => {
+    mockTransferCallback = resolve;
+    mockTransferRegisterer.register();
+  });
+
+  registerCleanupFunction(function () {
+    mockTransferRegisterer.unregister();
+    tempDir.remove(true);
+  });
+
+  document.getElementById("context-savelink").doCommand();
+
+  let contextMenu = document.getElementById("contentAreaContextMenu");
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(
+    document,
+    "popuphidden"
+  );
+  contextMenu.hidePopup();
+  await popupHiddenPromise;
+
+  await transferCompletePromise;
+
+  is(destFile.leafName, "thefile.js", "filename extension is not modified");
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async () => {
+  MockFilePicker.cleanup();
+  await new Promise(resolve => httpServer.stop(resolve));
+});
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/toolkit/content/tests/browser/common/mockTransfer.js",
+  this
+);
+
+function createTemporarySaveDirectory() {
+  let saveDir = Services.dirsvc.get("TmpD", Ci.nsIFile);
+  saveDir.append("testsavedir");
+  if (!saveDir.exists()) {
+    saveDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
+  }
+  return saveDir;
+}
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_blob.js b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_blob.js
new file mode 100644
index 0000000000..7b3900f46f
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_blob.js
@@ -0,0 +1,118 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const UCT_URI = "chrome://mozapps/content/downloads/unknownContentType.xhtml";
+
+async function promiseDownloadFinished(list) {
+  return new Promise(resolve => {
+    list.addView({
+      onDownloadChanged(download) {
+        info("Download changed!");
+        if (download.succeeded || download.error) {
+          info("Download succeeded or errored");
+          list.removeView(this);
+          resolve(download);
+        }
+      },
+    });
+  });
+}
+
+/**
+ * Check that both in the download "what do you want to do with this file"
+ * dialog and in the about:downloads download list, we represent blob URL
+ * download sources using the principal (origin) that generated the blob.
+ */
+add_task(async function test_check_blob_origin_representation() {
+  forcePromptForFiles("text/plain", "txt");
+
+  await check_blob_origin(
+    "https://example.org/1",
+    "example.org",
+    "example.org"
+  );
+  await check_blob_origin(
+    "data:text/html,<body>Some Text<br>",
+    "(data)",
+    "blob"
+  );
+});
+
+async function check_blob_origin(pageURL, expectedSource, expectedListOrigin) {
+  await BrowserTestUtils.withNewTab(pageURL, async browser => {
+    // Ensure we wait for the download to finish:
+    let downloadList = await Downloads.getList(Downloads.PUBLIC);
+    let downloadPromise = promiseDownloadFinished(downloadList);
+
+    // Wait for the download prompting dialog
+    let dialogPromise = BrowserTestUtils.domWindowOpenedAndLoaded(
+      null,
+      win => win.document.documentURI == UCT_URI
+    );
+
+    // create and click an <a download> link to a txt file.
+    await SpecialPowers.spawn(browser, [], () => {
+      // Use `eval` to get a blob URL scoped to content, so that content is
+      // actually allowed to open it and so we can check the origin is correct.
+      let url = content.eval(`
+        window.foo = new Blob(["Hello"], {type: "text/plain"});
+        URL.createObjectURL(window.foo)`);
+      let link = content.document.createElement("a");
+      link.href = url;
+      link.textContent = "Click me, click me, me me me";
+      link.download = "my-file.txt";
+      content.document.body.append(link);
+      link.click();
+    });
+
+    // Check what we display in the dialog
+    let dialogWin = await dialogPromise;
+    let source = dialogWin.document.getElementById("source");
+    is(
+      source.value,
+      expectedSource,
+      "Should list origin as source if available."
+    );
+
+    // Close the dialog
+    let closedPromise = BrowserTestUtils.windowClosed(dialogWin);
+    // Ensure we're definitely saving (otherwise this depends on mime service
+    // defaults):
+    dialogWin.document.getElementById("save").click();
+    let dialogNode = dialogWin.document.querySelector("dialog");
+    dialogNode.getButton("accept").disabled = false;
+    dialogNode.acceptDialog();
+    await closedPromise;
+
+    // Wait for the download to finish and ensure it is cleared up.
+    let download = await downloadPromise;
+    registerCleanupFunction(async () => {
+      let target = download.target.path;
+      await download.finalize();
+      await IOUtils.remove(target);
+    });
+
+    // Check that the same download is displayed correctly in about:downloads.
+    await BrowserTestUtils.withNewTab("about:downloads", async dlBrowser => {
+      let doc = dlBrowser.contentDocument;
+      let listNode = doc.getElementById("downloadsListBox");
+      await BrowserTestUtils.waitForMutationCondition(
+        listNode,
+        { childList: true, subtree: true, attributeFilter: ["value"] },
+        () =>
+          listNode.firstElementChild
+            ?.querySelector(".downloadDetailsNormal")
+            ?.getAttribute("value")
+      );
+      let download = listNode.firstElementChild;
+      let detailString = download.querySelector(".downloadDetailsNormal").value;
+      Assert.stringContains(
+        detailString,
+        expectedListOrigin,
+        "Should list origin in download list if available."
+      );
+    });
+  });
+}
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_delayedbutton.js b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_delayedbutton.js
new file mode 100644
index 0000000000..426a740cd7
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_delayedbutton.js
@@ -0,0 +1,96 @@
+/* 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/. */
+
+const UCT_URI = "chrome://mozapps/content/downloads/unknownContentType.xhtml";
+const LOAD_URI =
+  "http://mochi.test:8888/browser/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt";
+
+const DIALOG_DELAY =
+  Services.prefs.getIntPref("security.dialog_enable_delay") + 200;
+
+let UCTObserver = {
+  opened: PromiseUtils.defer(),
+  closed: PromiseUtils.defer(),
+
+  observe(aSubject, aTopic, aData) {
+    let win = aSubject;
+
+    switch (aTopic) {
+      case "domwindowopened":
+        win.addEventListener(
+          "load",
+          function onLoad(event) {
+            // Let the dialog initialize
+            SimpleTest.executeSoon(function () {
+              UCTObserver.opened.resolve(win);
+            });
+          },
+          { once: true }
+        );
+        break;
+
+      case "domwindowclosed":
+        if (win.location == UCT_URI) {
+          this.closed.resolve();
+        }
+        break;
+    }
+  },
+};
+
+function waitDelay(delay) {
+  return new Promise((resolve, reject) => {
+    /* eslint-disable mozilla/no-arbitrary-setTimeout */
+    window.setTimeout(resolve, delay);
+  });
+}
+
+add_task(async function test_unknownContentType_delayedbutton() {
+  info("Starting browser_unknownContentType_delayedbutton.js...");
+  forcePromptForFiles("text/plain", "txt");
+
+  Services.ww.registerNotification(UCTObserver);
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: LOAD_URI,
+      waitForLoad: false,
+      waitForStateStop: true,
+    },
+    async function () {
+      let uctWindow = await UCTObserver.opened.promise;
+      let dialog = uctWindow.document.getElementById("unknownContentType");
+      let ok = dialog.getButton("accept");
+
+      SimpleTest.is(ok.disabled, true, "button started disabled");
+
+      await waitDelay(DIALOG_DELAY);
+
+      SimpleTest.is(ok.disabled, false, "button was enabled");
+
+      let focusOutOfDialog = SimpleTest.promiseFocus(window);
+      window.focus();
+      await focusOutOfDialog;
+
+      SimpleTest.is(ok.disabled, true, "button was disabled");
+
+      let focusOnDialog = SimpleTest.promiseFocus(uctWindow);
+      uctWindow.focus();
+      await focusOnDialog;
+
+      SimpleTest.is(ok.disabled, true, "button remained disabled");
+
+      await waitDelay(DIALOG_DELAY);
+      SimpleTest.is(ok.disabled, false, "button re-enabled after delay");
+
+      dialog.cancelDialog();
+      await UCTObserver.closed.promise;
+
+      Services.ww.unregisterNotification(UCTObserver);
+      uctWindow = null;
+      UCTObserver = null;
+    }
+  );
+});
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_dialog_layout.js b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_dialog_layout.js
new file mode 100644
index 0000000000..577e341f90
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_dialog_layout.js
@@ -0,0 +1,103 @@
+/* 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/. */
+
+/*
+ * The unknownContentType popup can have two different layouts depending on
+ * whether a helper application can be selected or not.
+ * This tests that both layouts have correct collapsed elements.
+ */
+
+const UCT_URI = "chrome://mozapps/content/downloads/unknownContentType.xhtml";
+
+let tests = [
+  {
+    // This URL will trigger the simple UI, where only the Save an Cancel buttons are available
+    url: "http://mochi.test:8888/browser/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif",
+    elements: {
+      basicBox: { collapsed: false },
+      normalBox: { collapsed: true },
+    },
+  },
+  {
+    // This URL will trigger the full UI
+    url: "http://mochi.test:8888/browser/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt",
+    elements: {
+      basicBox: { collapsed: true },
+      normalBox: { collapsed: false },
+    },
+  },
+];
+
+add_task(async function test_unknownContentType_dialog_layout() {
+  forcePromptForFiles("text/plain", "txt");
+  forcePromptForFiles("application/octet-stream", "pif");
+
+  for (let test of tests) {
+    let UCTObserver = {
+      opened: PromiseUtils.defer(),
+      closed: PromiseUtils.defer(),
+
+      observe(aSubject, aTopic, aData) {
+        let win = aSubject;
+
+        switch (aTopic) {
+          case "domwindowopened":
+            win.addEventListener(
+              "load",
+              function onLoad(event) {
+                // Let the dialog initialize
+                SimpleTest.executeSoon(function () {
+                  UCTObserver.opened.resolve(win);
+                });
+              },
+              { once: true }
+            );
+            break;
+
+          case "domwindowclosed":
+            if (win.location == UCT_URI) {
+              this.closed.resolve();
+            }
+            break;
+        }
+      },
+    };
+
+    Services.ww.registerNotification(UCTObserver);
+    await BrowserTestUtils.withNewTab(
+      {
+        gBrowser,
+        url: test.url,
+        waitForLoad: false,
+        waitForStateStop: true,
+      },
+      async function () {
+        let uctWindow = await UCTObserver.opened.promise;
+
+        for (let [id, props] of Object.entries(test.elements)) {
+          let elem = uctWindow.dialog.dialogElement(id);
+          for (let [prop, value] of Object.entries(props)) {
+            SimpleTest.is(
+              elem[prop],
+              value,
+              "Element with id " +
+                id +
+                " has property " +
+                prop +
+                " set to " +
+                value
+            );
+          }
+        }
+        let focusOnDialog = SimpleTest.promiseFocus(uctWindow);
+        uctWindow.focus();
+        await focusOnDialog;
+
+        uctWindow.document.getElementById("unknownContentType").cancelDialog();
+        uctWindow = null;
+        Services.ww.unregisterNotification(UCTObserver);
+      }
+    );
+  }
+});
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_extension.js b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_extension.js
new file mode 100644
index 0000000000..1bb836c1d8
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_extension.js
@@ -0,0 +1,58 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "http://example.com"
+);
+
+/**
+ * Check that case-sensitivity doesn't cause us to duplicate
+ * file name extensions.
+ */
+add_task(async function test_download_filename_extension() {
+  forcePromptForFiles("application/octet-stream", "exe");
+  let windowObserver = BrowserTestUtils.domWindowOpenedAndLoaded();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "unknownContentType.EXE",
+    waitForLoad: false,
+  });
+  let win = await windowObserver;
+
+  let list = await Downloads.getList(Downloads.ALL);
+  let downloadFinishedPromise = new Promise(resolve => {
+    list.addView({
+      onDownloadChanged(download) {
+        if (download.stopped) {
+          list.removeView(this);
+          resolve(download);
+        }
+      },
+    });
+  });
+
+  let dialog = win.document.querySelector("dialog");
+  dialog.getButton("accept").removeAttribute("disabled");
+  dialog.acceptDialog();
+  let download = await downloadFinishedPromise;
+  // We cannot assume that the filename didn't change.
+  let filename = PathUtils.filename(download.target.path);
+  Assert.ok(
+    filename.indexOf(".") == filename.lastIndexOf("."),
+    "Should not duplicate extension"
+  );
+  Assert.ok(filename.endsWith(".EXE"), "Should not change extension");
+  await list.remove(download);
+  BrowserTestUtils.removeTab(tab);
+  try {
+    await IOUtils.remove(download.target.path);
+  } catch (ex) {
+    // Ignore errors in removing the file, the system may keep it locked and
+    // it's not a critical issue.
+    info("Failed to remove the file " + ex);
+  }
+});
diff --git a/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_policy.js b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_policy.js
new file mode 100644
index 0000000000..ccb0d957bb
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/browser_unknownContentType_policy.js
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
+  "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
+);
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "http://example.com"
+);
+
+/**
+ * Check that policy allows certain extensions to be launched.
+ */
+add_task(async function test_download_jnlp_policy() {
+  forcePromptForFiles("application/x-java-jnlp-file", "jnlp");
+  let windowObserver = BrowserTestUtils.domWindowOpenedAndLoaded();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "example.jnlp",
+    waitForLoad: false,
+  });
+  let win = await windowObserver;
+
+  let dialog = win.document.querySelector("dialog");
+  let normalBox = win.document.getElementById("normalBox");
+  let basicBox = win.document.getElementById("basicBox");
+  is(normalBox.collapsed, !AppConstants.IS_ESR);
+  is(basicBox.collapsed, AppConstants.IS_ESR);
+  dialog.cancelDialog();
+  BrowserTestUtils.removeTab(tab);
+
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {
+      ExemptDomainFileTypePairsFromFileTypeDownloadWarnings: [
+        {
+          file_extension: "jnlp",
+          domains: ["example.com"],
+        },
+      ],
+    },
+  });
+
+  windowObserver = BrowserTestUtils.domWindowOpenedAndLoaded();
+
+  tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PATH + "example.jnlp",
+    waitForLoad: false,
+  });
+  win = await windowObserver;
+
+  dialog = win.document.querySelector("dialog");
+  normalBox = win.document.getElementById("normalBox");
+  basicBox = win.document.getElementById("basicBox");
+  is(normalBox.collapsed, false);
+  is(basicBox.collapsed, true);
+  dialog.cancelDialog();
+  BrowserTestUtils.removeTab(tab);
+
+  await EnterprisePolicyTesting.setupPolicyEngineWithJson({
+    policies: {},
+  });
+});
diff --git a/toolkit/mozapps/downloads/tests/browser/example.jnlp b/toolkit/mozapps/downloads/tests/browser/example.jnlp
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/example.jnlp
diff --git a/toolkit/mozapps/downloads/tests/browser/example.jnlp^headers^ b/toolkit/mozapps/downloads/tests/browser/example.jnlp^headers^
new file mode 100644
index 0000000000..fac0de2095
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/example.jnlp^headers^
@@ -0,0 +1 @@
+Content-Type: application/x-java-jnlp-file
diff --git a/toolkit/mozapps/downloads/tests/browser/head.js b/toolkit/mozapps/downloads/tests/browser/head.js
new file mode 100644
index 0000000000..a5536e95b2
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/head.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+function forcePromptForFiles(mime, extension) {
+  const handlerSvc = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
+    Ci.nsIHandlerService
+  );
+  const mimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+
+  let txtHandlerInfo = mimeSvc.getFromTypeAndExtension(mime, extension);
+  txtHandlerInfo.preferredAction = Ci.nsIHandlerInfo.alwaysAsk;
+  txtHandlerInfo.alwaysAskBeforeHandling = true;
+  handlerSvc.store(txtHandlerInfo);
+  registerCleanupFunction(() => handlerSvc.remove(txtHandlerInfo));
+}
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE b/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE^headers^ b/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE^headers^
new file mode 100644
index 0000000000..09b22facc0
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType.EXE^headers^
@@ -0,0 +1 @@
+Content-Type: application/octet-stream
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif
new file mode 100644
index 0000000000..9353d13126
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif
@@ -0,0 +1 @@
+Dummy content for unknownContentType_dialog_layout_data.pif
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif^headers^ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif^headers^
new file mode 100644
index 0000000000..09b22facc0
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.pif^headers^
@@ -0,0 +1 @@
+Content-Type: application/octet-stream
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt
new file mode 100644
index 0000000000..77e7195596
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt
@@ -0,0 +1 @@
+Dummy content for unknownContentType_dialog_layout_data.txt
diff --git a/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt^headers^ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt^headers^
new file mode 100644
index 0000000000..2a3c472e26
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/browser/unknownContentType_dialog_layout_data.txt^headers^
@@ -0,0 +1,2 @@
+Content-Type: text/plain
+Content-Disposition: attachment
diff --git a/toolkit/mozapps/downloads/tests/moz.build b/toolkit/mozapps/downloads/tests/moz.build
new file mode 100644
index 0000000000..ffff033bd3
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/moz.build
@@ -0,0 +1,8 @@
+# -*- 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/.
+
+XPCSHELL_TESTS_MANIFESTS += ["unit/xpcshell.ini"]
+BROWSER_CHROME_MANIFESTS += ["browser/browser.ini"]
diff --git a/toolkit/mozapps/downloads/tests/unit/head_downloads.js b/toolkit/mozapps/downloads/tests/unit/head_downloads.js
new file mode 100644
index 0000000000..f3178decef
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/head_downloads.js
@@ -0,0 +1,5 @@
+registerCleanupFunction(function () {
+  Services.startup.advanceShutdownPhase(
+    Services.startup.SHUTDOWN_PHASE_APPSHUTDOWNCONFIRMED
+  );
+});
diff --git a/toolkit/mozapps/downloads/tests/unit/test_DownloadUtils.js b/toolkit/mozapps/downloads/tests/unit/test_DownloadUtils.js
new file mode 100644
index 0000000000..956601c71e
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/test_DownloadUtils.js
@@ -0,0 +1,398 @@
+/* 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/. */
+
+const { DownloadUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/DownloadUtils.sys.mjs"
+);
+
+const gDecimalSymbol = Number(5.4).toLocaleString().match(/\D/);
+function _(str) {
+  return str.replace(/\./g, gDecimalSymbol);
+}
+
+function testConvertByteUnits(aBytes, aValue, aUnit) {
+  let [value, unit] = DownloadUtils.convertByteUnits(aBytes);
+  Assert.equal(value, aValue);
+  Assert.equal(unit, aUnit);
+}
+
+function testTransferTotal(aCurrBytes, aMaxBytes, aTransfer) {
+  let transfer = DownloadUtils.getTransferTotal(aCurrBytes, aMaxBytes);
+  Assert.equal(transfer, aTransfer);
+}
+
+// Get the em-dash character because typing it directly here doesn't work :(
+var gDash = DownloadUtils.getDownloadStatus(0)[0].match(/left (.) 0 bytes/)[1];
+
+var gVals = [
+  0,
+  100,
+  2345,
+  55555,
+  982341,
+  23194134,
+  1482,
+  58,
+  9921949201,
+  13498132,
+  Infinity,
+];
+
+function testStatus(aFunc, aCurr, aMore, aRate, aTest) {
+  dump("Status Test: " + [aCurr, aMore, aRate, aTest] + "\n");
+  let curr = gVals[aCurr];
+  let max = curr + gVals[aMore];
+  let speed = gVals[aRate];
+
+  let [status, last] = aFunc(curr, max, speed);
+
+  if (0) {
+    dump(
+      "testStatus(" +
+        aCurr +
+        ", " +
+        aMore +
+        ", " +
+        aRate +
+        ', ["' +
+        status.replace(gDash, "--") +
+        '", ' +
+        last.toFixed(3) +
+        "]);\n"
+    );
+  }
+
+  // Make sure the status text matches
+  Assert.equal(status, _(aTest[0].replace(/--/, gDash)));
+
+  // Make sure the lastSeconds matches
+  if (last == Infinity) {
+    Assert.equal(last, aTest[1]);
+  } else {
+    Assert.ok(Math.abs(last - aTest[1]) < 0.1);
+  }
+}
+
+function testFormattedTimeStatus(aSec, aExpected) {
+  dump("Formatted Time Status Test: [" + aSec + "]\n");
+
+  let status = DownloadUtils.getFormattedTimeStatus(aSec);
+  dump("Formatted Time Status Test Returns: (" + status.l10n.id + ")\n");
+
+  Assert.equal(status.l10n.id, aExpected);
+}
+
+function testURI(aURI, aDisp, aHost) {
+  dump("URI Test: " + [aURI, aDisp, aHost] + "\n");
+
+  let [disp, host] = DownloadUtils.getURIHost(aURI);
+
+  // Make sure we have the right display host and full host
+  Assert.equal(disp, aDisp);
+  Assert.equal(host, aHost);
+}
+
+function testGetReadableDates(aDate, aCompactValue) {
+  const now = new Date(2000, 11, 31, 11, 59, 59);
+
+  let [dateCompact] = DownloadUtils.getReadableDates(aDate, now);
+  Assert.equal(dateCompact, aCompactValue);
+}
+
+function testAllGetReadableDates() {
+  // This test cannot depend on the current date and time, or the date format.
+  // It depends on being run with the English localization, however.
+  const today_11_30 = new Date(2000, 11, 31, 11, 30, 15);
+  const today_12_30 = new Date(2000, 11, 31, 12, 30, 15);
+  const yesterday_11_30 = new Date(2000, 11, 30, 11, 30, 15);
+  const yesterday_12_30 = new Date(2000, 11, 30, 12, 30, 15);
+  const twodaysago = new Date(2000, 11, 29, 11, 30, 15);
+  const sixdaysago = new Date(2000, 11, 25, 11, 30, 15);
+  const sevendaysago = new Date(2000, 11, 24, 11, 30, 15);
+
+  let cDtf = Services.intl.DateTimeFormat;
+
+  testGetReadableDates(
+    today_11_30,
+    new cDtf(undefined, { timeStyle: "short" }).format(today_11_30)
+  );
+  testGetReadableDates(
+    today_12_30,
+    new cDtf(undefined, { timeStyle: "short" }).format(today_12_30)
+  );
+
+  testGetReadableDates(yesterday_11_30, "Yesterday");
+  testGetReadableDates(yesterday_12_30, "Yesterday");
+  testGetReadableDates(
+    twodaysago,
+    twodaysago.toLocaleDateString(undefined, { weekday: "long" })
+  );
+  testGetReadableDates(
+    sixdaysago,
+    sixdaysago.toLocaleDateString(undefined, { weekday: "long" })
+  );
+  testGetReadableDates(
+    sevendaysago,
+    sevendaysago.toLocaleDateString(undefined, { month: "long" }) +
+      " " +
+      sevendaysago.getDate().toString().padStart(2, "0")
+  );
+
+  let [, dateTimeFull] = DownloadUtils.getReadableDates(today_11_30);
+
+  const dtOptions = { dateStyle: "long", timeStyle: "short" };
+  Assert.equal(
+    dateTimeFull,
+    new cDtf(undefined, dtOptions).format(today_11_30)
+  );
+}
+
+function run_test() {
+  testConvertByteUnits(-1, "-1", "bytes");
+  testConvertByteUnits(1, _("1"), "bytes");
+  testConvertByteUnits(42, _("42"), "bytes");
+  testConvertByteUnits(123, _("123"), "bytes");
+  testConvertByteUnits(1024, _("1.0"), "KB");
+  testConvertByteUnits(8888, _("8.7"), "KB");
+  testConvertByteUnits(59283, _("57.9"), "KB");
+  testConvertByteUnits(640000, _("625"), "KB");
+  testConvertByteUnits(1048576, _("1.0"), "MB");
+  testConvertByteUnits(307232768, _("293"), "MB");
+  testConvertByteUnits(1073741824, _("1.0"), "GB");
+
+  testTransferTotal(1, 1, _("1 of 1 bytes"));
+  testTransferTotal(234, 4924, _("234 bytes of 4.8 KB"));
+  testTransferTotal(94923, 233923, _("92.7 of 228 KB"));
+  testTransferTotal(4924, 94923, _("4.8 of 92.7 KB"));
+  testTransferTotal(2342, 294960345, _("2.3 KB of 281 MB"));
+  testTransferTotal(234, undefined, _("234 bytes"));
+  testTransferTotal(4889023, undefined, _("4.7 MB"));
+
+  if (0) {
+    // Help find some interesting test cases
+    let r = () => Math.floor(Math.random() * 10);
+    for (let i = 0; i < 100; i++) {
+      testStatus(r(), r(), r());
+    }
+  }
+
+  // First, test with rates, via getDownloadStatus...
+  let statusFunc = DownloadUtils.getDownloadStatus.bind(DownloadUtils);
+
+  testStatus(statusFunc, 2, 1, 7, [
+    "A few seconds left -- 2.3 of 2.4 KB (58 bytes/sec)",
+    1.724,
+  ]);
+  testStatus(statusFunc, 1, 2, 6, [
+    "A few seconds left -- 100 bytes of 2.4 KB (1.4 KB/sec)",
+    1.582,
+  ]);
+  testStatus(statusFunc, 4, 3, 9, [
+    "A few seconds left -- 959 KB of 1.0 MB (12.9 MB/sec)",
+    0.004,
+  ]);
+  testStatus(statusFunc, 2, 3, 8, [
+    "A few seconds left -- 2.3 of 56.5 KB (9.2 GB/sec)",
+    0.0,
+  ]);
+
+  testStatus(statusFunc, 8, 4, 3, [
+    "17s left -- 9.2 of 9.2 GB (54.3 KB/sec)",
+    17.682,
+  ]);
+  testStatus(statusFunc, 1, 3, 2, [
+    "23s left -- 100 bytes of 54.4 KB (2.3 KB/sec)",
+    23.691,
+  ]);
+  testStatus(statusFunc, 9, 3, 2, [
+    "23s left -- 12.9 of 12.9 MB (2.3 KB/sec)",
+    23.691,
+  ]);
+  testStatus(statusFunc, 5, 6, 7, [
+    "25s left -- 22.1 of 22.1 MB (58 bytes/sec)",
+    25.552,
+  ]);
+
+  testStatus(statusFunc, 3, 9, 3, [
+    "4m left -- 54.3 KB of 12.9 MB (54.3 KB/sec)",
+    242.969,
+  ]);
+  testStatus(statusFunc, 2, 3, 1, [
+    "9m left -- 2.3 of 56.5 KB (100 bytes/sec)",
+    555.55,
+  ]);
+  testStatus(statusFunc, 4, 3, 7, [
+    "15m left -- 959 KB of 1.0 MB (58 bytes/sec)",
+    957.845,
+  ]);
+  testStatus(statusFunc, 5, 3, 7, [
+    "15m left -- 22.1 of 22.2 MB (58 bytes/sec)",
+    957.845,
+  ]);
+
+  testStatus(statusFunc, 1, 9, 2, [
+    "1h 35m left -- 100 bytes of 12.9 MB (2.3 KB/sec)",
+    5756.133,
+  ]);
+  testStatus(statusFunc, 2, 9, 6, [
+    "2h 31m left -- 2.3 KB of 12.9 MB (1.4 KB/sec)",
+    9108.051,
+  ]);
+  testStatus(statusFunc, 2, 4, 1, [
+    "2h 43m left -- 2.3 of 962 KB (100 bytes/sec)",
+    9823.41,
+  ]);
+  testStatus(statusFunc, 6, 4, 7, [
+    "4h 42m left -- 1.4 of 961 KB (58 bytes/sec)",
+    16936.914,
+  ]);
+
+  testStatus(statusFunc, 6, 9, 1, [
+    "1d 13h left -- 1.4 KB of 12.9 MB (100 bytes/sec)",
+    134981.32,
+  ]);
+  testStatus(statusFunc, 3, 8, 3, [
+    "2d 1h left -- 54.3 KB of 9.2 GB (54.3 KB/sec)",
+    178596.872,
+  ]);
+  testStatus(statusFunc, 1, 8, 6, [
+    "77d 11h left -- 100 bytes of 9.2 GB (1.4 KB/sec)",
+    6694972.47,
+  ]);
+  testStatus(statusFunc, 6, 8, 7, [
+    "1,979d 22h left -- 1.4 KB of 9.2 GB (58 bytes/sec)",
+    171068089.672,
+  ]);
+
+  testStatus(statusFunc, 0, 0, 5, [
+    "Unknown time left -- 0 of 0 bytes (22.1 MB/sec)",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 0, 6, 0, [
+    "Unknown time left -- 0 bytes of 1.4 KB (0 bytes/sec)",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 6, 6, 0, [
+    "Unknown time left -- 1.4 of 2.9 KB (0 bytes/sec)",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 8, 5, 0, [
+    "Unknown time left -- 9.2 of 9.3 GB (0 bytes/sec)",
+    Infinity,
+  ]);
+
+  // With rate equal to Infinity
+  testStatus(statusFunc, 0, 0, 10, [
+    "Unknown time left -- 0 of 0 bytes (Really fast)",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 1, 2, 10, [
+    "A few seconds left -- 100 bytes of 2.4 KB (Really fast)",
+    0,
+  ]);
+
+  // Now test without rates, via getDownloadStatusNoRate.
+  statusFunc = DownloadUtils.getDownloadStatusNoRate.bind(DownloadUtils);
+
+  testStatus(statusFunc, 2, 1, 7, [
+    "A few seconds left -- 2.3 of 2.4 KB",
+    1.724,
+  ]);
+  testStatus(statusFunc, 1, 2, 6, [
+    "A few seconds left -- 100 bytes of 2.4 KB",
+    1.582,
+  ]);
+  testStatus(statusFunc, 4, 3, 9, [
+    "A few seconds left -- 959 KB of 1.0 MB",
+    0.004,
+  ]);
+  testStatus(statusFunc, 2, 3, 8, [
+    "A few seconds left -- 2.3 of 56.5 KB",
+    0.0,
+  ]);
+
+  testStatus(statusFunc, 8, 4, 3, ["17s left -- 9.2 of 9.2 GB", 17.682]);
+  testStatus(statusFunc, 1, 3, 2, ["23s left -- 100 bytes of 54.4 KB", 23.691]);
+  testStatus(statusFunc, 9, 3, 2, ["23s left -- 12.9 of 12.9 MB", 23.691]);
+  testStatus(statusFunc, 5, 6, 7, ["25s left -- 22.1 of 22.1 MB", 25.552]);
+
+  testStatus(statusFunc, 3, 9, 3, ["4m left -- 54.3 KB of 12.9 MB", 242.969]);
+  testStatus(statusFunc, 2, 3, 1, ["9m left -- 2.3 of 56.5 KB", 555.55]);
+  testStatus(statusFunc, 4, 3, 7, ["15m left -- 959 KB of 1.0 MB", 957.845]);
+  testStatus(statusFunc, 5, 3, 7, ["15m left -- 22.1 of 22.2 MB", 957.845]);
+
+  testStatus(statusFunc, 1, 9, 2, [
+    "1h 35m left -- 100 bytes of 12.9 MB",
+    5756.133,
+  ]);
+  testStatus(statusFunc, 2, 9, 6, [
+    "2h 31m left -- 2.3 KB of 12.9 MB",
+    9108.051,
+  ]);
+  testStatus(statusFunc, 2, 4, 1, ["2h 43m left -- 2.3 of 962 KB", 9823.41]);
+  testStatus(statusFunc, 6, 4, 7, ["4h 42m left -- 1.4 of 961 KB", 16936.914]);
+
+  testStatus(statusFunc, 6, 9, 1, [
+    "1d 13h left -- 1.4 KB of 12.9 MB",
+    134981.32,
+  ]);
+  testStatus(statusFunc, 3, 8, 3, [
+    "2d 1h left -- 54.3 KB of 9.2 GB",
+    178596.872,
+  ]);
+  testStatus(statusFunc, 1, 8, 6, [
+    "77d 11h left -- 100 bytes of 9.2 GB",
+    6694972.47,
+  ]);
+  testStatus(statusFunc, 6, 8, 7, [
+    "1,979d 22h left -- 1.4 KB of 9.2 GB",
+    171068089.672,
+  ]);
+
+  testStatus(statusFunc, 0, 0, 5, [
+    "Unknown time left -- 0 of 0 bytes",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 0, 6, 0, [
+    "Unknown time left -- 0 bytes of 1.4 KB",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 6, 6, 0, [
+    "Unknown time left -- 1.4 of 2.9 KB",
+    Infinity,
+  ]);
+  testStatus(statusFunc, 8, 5, 0, [
+    "Unknown time left -- 9.2 of 9.3 GB",
+    Infinity,
+  ]);
+
+  testFormattedTimeStatus(-1, "downloading-file-opens-in-some-time-2");
+  // Passing in null will return a status of file-opens-in-seconds, as Math.floor(null) = 0
+  testFormattedTimeStatus(null, "downloading-file-opens-in-seconds-2");
+  testFormattedTimeStatus(0, "downloading-file-opens-in-seconds-2");
+  testFormattedTimeStatus(30, "downloading-file-opens-in-seconds-2");
+
+  testURI("http://www.mozilla.org/", "mozilla.org", "www.mozilla.org");
+  testURI(
+    "http://www.city.mikasa.hokkaido.jp/",
+    "city.mikasa.hokkaido.jp",
+    "www.city.mikasa.hokkaido.jp"
+  );
+  testURI("data:text/html,Hello World", "data resource", "data resource");
+  testURI(
+    "jar:http://www.mozilla.com/file!/magic",
+    "mozilla.com",
+    "www.mozilla.com"
+  );
+  testURI("file:///C:/Cool/Stuff/", "local file", "local file");
+  // Don't test for moz-icon if we don't have a protocol handler for it (e.g. b2g):
+  if ("@mozilla.org/network/protocol;1?name=moz-icon" in Cc) {
+    testURI("moz-icon:file:///test.extension", "local file", "local file");
+    testURI("moz-icon://.extension", "moz-icon resource", "moz-icon resource");
+  }
+  testURI("about:config", "about resource", "about resource");
+  testURI("invalid.uri", "", "");
+
+  testAllGetReadableDates();
+}
diff --git a/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
new file mode 100644
index 0000000000..786da28b75
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
@@ -0,0 +1,56 @@
+/* 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 bug 448344 to make sure when we're in low minutes, we show both minutes
+ * and seconds; but continue to show only minutes when we have plenty.
+ */
+
+const { DownloadUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/DownloadUtils.sys.mjs"
+);
+
+/**
+ * Print some debug message to the console. All arguments will be printed,
+ * separated by spaces.
+ *
+ * @param [arg0, arg1, arg2, ...]
+ *        Any number of arguments to print out
+ * @usage _("Hello World") -> prints "Hello World"
+ * @usage _(1, 2, 3) -> prints "1 2 3"
+ */
+var _ = function (some, debug, text, to) {
+  print(Array.from(arguments).join(" "));
+};
+
+_("Make an array of time lefts and expected string to be shown for that time");
+var expectedTimes = [
+  [1.1, "A few seconds left", "under 4sec -> few"],
+  [2.5, "A few seconds left", "under 4sec -> few"],
+  [3.9, "A few seconds left", "under 4sec -> few"],
+  [5.3, "5s left", "truncate seconds"],
+  [1.1 * 60, "1m 6s left", "under 4min -> show sec"],
+  [2.5 * 60, "2m 30s left", "under 4min -> show sec"],
+  [3.9 * 60, "3m 54s left", "under 4min -> show sec"],
+  [5.3 * 60, "5m left", "over 4min -> only show min"],
+  [1.1 * 3600, "1h 6m left", "over 1hr -> show min/sec"],
+  [2.5 * 3600, "2h 30m left", "over 1hr -> show min/sec"],
+  [3.9 * 3600, "3h 54m left", "over 1hr -> show min/sec"],
+  [5.3 * 3600, "5h 18m left", "over 1hr -> show min/sec"],
+];
+_(expectedTimes.join("\n"));
+
+function run_test() {
+  expectedTimes.forEach(function ([time, expectStatus, comment]) {
+    _("Running test with time", time);
+    _("Test comment:", comment);
+    let [status, last] = DownloadUtils.getTimeLeft(time);
+
+    _("Got status:", status, "last:", last);
+    _("Expecting..", expectStatus);
+    Assert.equal(status, expectStatus);
+
+    _();
+  });
+}
diff --git a/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js b/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js
new file mode 100644
index 0000000000..d60baee447
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/test_syncedDownloadUtils.js
@@ -0,0 +1,28 @@
+/* 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 bug 420482 by making sure multiple consumers of DownloadUtils gets the
+ * same time remaining time if they provide the same time left but a different
+ * "last time".
+ */
+
+const { DownloadUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/DownloadUtils.sys.mjs"
+);
+
+function run_test() {
+  // Simulate having multiple downloads requesting time left
+  let downloadTimes = {};
+  for (let time of [1, 30, 60, 3456, 9999]) {
+    downloadTimes[time] = DownloadUtils.getTimeLeft(time)[0];
+  }
+
+  // Pretend we're a download status bar also asking for a time left, but we're
+  // using a different "last sec". We need to make sure we get the same time.
+  let lastSec = 314;
+  for (let [time, text] of Object.entries(downloadTimes)) {
+    Assert.equal(DownloadUtils.getTimeLeft(time, lastSec)[0], text);
+  }
+}
diff --git a/toolkit/mozapps/downloads/tests/unit/test_unspecified_arguments.js b/toolkit/mozapps/downloads/tests/unit/test_unspecified_arguments.js
new file mode 100644
index 0000000000..eb512d93ab
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/test_unspecified_arguments.js
@@ -0,0 +1,33 @@
+/* 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/. */
+
+/**
+ * Make sure passing null and nothing to various variable-arg DownloadUtils
+ * methods provide the same result.
+ */
+
+const { DownloadUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/DownloadUtils.sys.mjs"
+);
+
+function run_test() {
+  Assert.equal(
+    DownloadUtils.getDownloadStatus(1000, null, null, null) + "",
+    DownloadUtils.getDownloadStatus(1000) + ""
+  );
+  Assert.equal(
+    DownloadUtils.getDownloadStatus(1000, null, null) + "",
+    DownloadUtils.getDownloadStatus(1000, null) + ""
+  );
+
+  Assert.equal(
+    DownloadUtils.getTransferTotal(1000, null) + "",
+    DownloadUtils.getTransferTotal(1000) + ""
+  );
+
+  Assert.equal(
+    DownloadUtils.getTimeLeft(1000, null) + "",
+    DownloadUtils.getTimeLeft(1000) + ""
+  );
+}
diff --git a/toolkit/mozapps/downloads/tests/unit/xpcshell.ini b/toolkit/mozapps/downloads/tests/unit/xpcshell.ini
new file mode 100644
index 0000000000..703c84152d
--- /dev/null
+++ b/toolkit/mozapps/downloads/tests/unit/xpcshell.ini
@@ -0,0 +1,7 @@
+[DEFAULT]
+head = head_downloads.js
+
+[test_DownloadUtils.js]
+[test_lowMinutes.js]
+[test_syncedDownloadUtils.js]
+[test_unspecified_arguments.js]