Adding upstream version 124.0.1.upstream/124.0.1

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

103 files changed, 10456 insertions, 0 deletions

diff --git a/browser/components/migration/tests/browser/browser.toml b/browser/components/migration/tests/browser/browser.toml
new file mode 100644
index 0000000000..637c6da345
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser.toml
@@ -0,0 +1,50 @@
+[DEFAULT]
+head = "head.js"
+prefs = [
+  "browser.migrate.internal-testing.enabled=true",
+  "dom.window.sizeToContent.enabled=true",
+]
+support-files = ["../head-common.js"]
+
+["browser_aboutwelcome_behavior.js"]
+
+["browser_dialog_cancel_close.js"]
+
+["browser_dialog_open.js"]
+
+["browser_dialog_resize.js"]
+
+["browser_disabled_migrator.js"]
+
+["browser_do_migration.js"]
+
+["browser_entrypoint_telemetry.js"]
+
+["browser_extension_migration.js"]
+skip-if = ["win11_2009"] # Bug 1840718
+
+["browser_file_migration.js"]
+skip-if = [
+  "os == 'win' && debug", # Bug 1827995
+  "a11y_checks", # Bug 1858037 to investigate intermittent a11y_checks results (fails on Try, passes on Autoland)
+]
+support-files = ["dummy_file.csv"]
+
+["browser_ie_edge_bookmarks_success_strings.js"]
+skip-if = ["a11y_checks"] # Bug 1858037 to investigate intermittent a11y_checks results (fails on Try, passes on Autoland)
+
+["browser_misc_telemetry.js"]
+skip-if = ["a11y_checks"] # Bug 1858037 to investigate intermittent a11y_checks results (fails on Autoland, passes on Try)
+
+["browser_no_browsers_state.js"]
+
+["browser_only_file_migrators.js"]
+
+["browser_permissions.js"]
+skip-if = ["a11y_checks"] # Bug 1858037 and 1855492 to investigate intermittent a11y_checks results (fails on Try, passes on Autoland)
+
+["browser_safari_passwords.js"]
+run-if = ["os == 'mac'"]
+
+["browser_safari_permissions.js"]
+run-if = ["os == 'mac'"]
diff --git a/browser/components/migration/tests/browser/browser_aboutwelcome_behavior.js b/browser/components/migration/tests/browser/browser_aboutwelcome_behavior.js
new file mode 100644
index 0000000000..72c90851e2
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_aboutwelcome_behavior.js
@@ -0,0 +1,100 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that if browser.migrate.content-modal.about-welcome-behavior
+ * is "autoclose", that closing the migration dialog when opened with the
+ * NEWTAB entrypoint (which currently only occurs from about:welcome),
+ * will result in the about:preferences tab closing too.
+ */
+add_task(async function test_autoclose_from_welcome() {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:blank");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.migrate.content-modal.about-welcome-behavior", "autoclose"],
+    ],
+  });
+
+  let migrationDialogPromise = waitForMigrationWizardDialogTab();
+  MigrationUtils.showMigrationWizard(window, {
+    entrypoint: MigrationUtils.MIGRATION_ENTRYPOINTS.NEWTAB,
+  });
+
+  let prefsBrowser = await migrationDialogPromise;
+  let prefsTab = gBrowser.getTabForBrowser(prefsBrowser);
+
+  let tabClosed = BrowserTestUtils.waitForTabClosing(prefsTab);
+
+  let dialog = prefsBrowser.contentDocument.querySelector(
+    "#migrationWizardDialog"
+  );
+
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+  await BrowserTestUtils.synthesizeKey("VK_ESCAPE", {}, prefsBrowser);
+  await dialogClosed;
+  await tabClosed;
+  Assert.ok(true, "Preferences tab closed with autoclose behavior.");
+});
+
+/**
+ * Tests that if browser.migrate.content-modal.about-welcome-behavior
+ * is "default", that closing the migration dialog when opened with the
+ * NEWTAB entrypoint (which currently only occurs from about:welcome),
+ * will result in the about:preferences tab still staying open.
+ */
+add_task(async function test_no_autoclose_from_welcome() {
+  // Create a new blank tab which about:preferences will open into.
+  await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:blank");
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.migrate.content-modal.about-welcome-behavior", "default"]],
+  });
+
+  let migrationDialogPromise = waitForMigrationWizardDialogTab();
+  MigrationUtils.showMigrationWizard(window, {
+    entrypoint: MigrationUtils.MIGRATION_ENTRYPOINTS.NEWTAB,
+  });
+
+  let prefsBrowser = await migrationDialogPromise;
+  let prefsTab = gBrowser.getTabForBrowser(prefsBrowser);
+
+  let dialog = prefsBrowser.contentDocument.querySelector(
+    "#migrationWizardDialog"
+  );
+
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+  await BrowserTestUtils.synthesizeKey("VK_ESCAPE", {}, prefsBrowser);
+  await dialogClosed;
+  Assert.ok(!prefsTab.closing, "about:preferences tab is not closing.");
+
+  BrowserTestUtils.removeTab(prefsTab);
+});
+
+/**
+ * Tests that if browser.migrate.content-modal.about-welcome-behavior
+ * is "standalone", that opening the migration wizard from the NEWTAB
+ * entrypoint opens the migration wizard in a standalone top-level
+ * window.
+ */
+add_task(async function test_no_autoclose_from_welcome() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.migrate.content-modal.about-welcome-behavior", "standalone"],
+    ],
+  });
+
+  let windowOpened = BrowserTestUtils.domWindowOpened();
+  MigrationUtils.showMigrationWizard(window, {
+    entrypoint: MigrationUtils.MIGRATION_ENTRYPOINTS.NEWTAB,
+  });
+  let dialogWin = await windowOpened;
+  Assert.ok(dialogWin, "Top-level dialog window opened for the migrator.");
+  await BrowserTestUtils.waitForEvent(dialogWin, "MigrationWizard:Ready");
+
+  let dialogClosed = BrowserTestUtils.domWindowClosed(dialogWin);
+  dialogWin.close();
+  await dialogClosed;
+});
diff --git a/browser/components/migration/tests/browser/browser_dialog_cancel_close.js b/browser/components/migration/tests/browser/browser_dialog_cancel_close.js
new file mode 100644
index 0000000000..8fe510cf30
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_dialog_cancel_close.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that pressing "Cancel" from the selection page of the migration
+ * dialog closes the dialog when opened in about:preferences as an HTML5
+ * dialog.
+ */
+add_task(async function test_cancel_close() {
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let cancelButton = shadow.querySelector(
+      'div[name="page-selection"] .cancel-close'
+    );
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+    cancelButton.click();
+    await dialogClosed;
+    Assert.ok(true, "Clicking the cancel button closed the dialog.");
+  });
+});
+
+/**
+ * Tests that pressing "Cancel" from the selection page of the migration
+ * dialog closes the dialog when opened in stand-alone window.
+ */
+add_task(async function test_cancel_close() {
+  let promiseWinLoaded = BrowserTestUtils.domWindowOpened().then(win => {
+    return BrowserTestUtils.waitForEvent(win, "MigrationWizard:Ready");
+  });
+
+  let win = Services.ww.openWindow(
+    window,
+    DIALOG_URL,
+    "_blank",
+    "dialog,centerscreen",
+    {}
+  );
+  await promiseWinLoaded;
+
+  win.sizeToContent();
+  let wizard = win.document.querySelector("#wizard");
+  let shadow = wizard.openOrClosedShadowRoot;
+  let cancelButton = shadow.querySelector(
+    'div[name="page-selection"] .cancel-close'
+  );
+
+  let windowClosed = BrowserTestUtils.windowClosed(win);
+  cancelButton.click();
+  await windowClosed;
+  Assert.ok(true, "Window was closed.");
+});
diff --git a/browser/components/migration/tests/browser/browser_dialog_open.js b/browser/components/migration/tests/browser/browser_dialog_open.js
new file mode 100644
index 0000000000..1ec43f0ea6
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_dialog_open.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that we can open the migration dialog in an about:preferences
+ * HTML5 dialog when calling MigrationUtils.showMigrationWizard within a
+ * tabbrowser window execution context.
+ */
+add_task(async function test_migration_dialog_open_in_tab_dialog_box() {
+  let migrationDialogPromise = waitForMigrationWizardDialogTab();
+  MigrationUtils.showMigrationWizard(window, {});
+  let prefsBrowser = await migrationDialogPromise;
+  Assert.ok(true, "Migration dialog was opened");
+  let dialog = prefsBrowser.contentDocument.querySelector(
+    "#migrationWizardDialog"
+  );
+
+  let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+  await BrowserTestUtils.synthesizeKey("VK_ESCAPE", {}, prefsBrowser);
+  await dialogClosed;
+  BrowserTestUtils.startLoadingURIString(prefsBrowser, "about:blank");
+  await BrowserTestUtils.browserLoaded(prefsBrowser);
+});
+
+/**
+ * Tests that we can open the migration dialog in a stand-alone window
+ * when calling MigrationUtils.showMigrationWizard with a null opener
+ * argument, or a non-tabbrowser window context.
+ */
+add_task(async function test_migration_dialog_open_in_xul_window() {
+  let firstWindowOpened = BrowserTestUtils.domWindowOpened();
+  MigrationUtils.showMigrationWizard(null, {});
+  let firstDialogWin = await firstWindowOpened;
+
+  await BrowserTestUtils.waitForEvent(firstDialogWin, "MigrationWizard:Ready");
+
+  Assert.ok(true, "Migration dialog was opened");
+
+  // Now open a second migration dialog, using the first as the window
+  // argument.
+
+  let secondWindowOpened = BrowserTestUtils.domWindowOpened();
+  MigrationUtils.showMigrationWizard(firstDialogWin, {});
+  let secondDialogWin = await secondWindowOpened;
+
+  await BrowserTestUtils.waitForEvent(secondDialogWin, "MigrationWizard:Ready");
+
+  for (let dialogWin of [firstDialogWin, secondDialogWin]) {
+    let dialogClosed = BrowserTestUtils.domWindowClosed(dialogWin);
+    dialogWin.close();
+    await dialogClosed;
+  }
+});
diff --git a/browser/components/migration/tests/browser/browser_dialog_resize.js b/browser/components/migration/tests/browser/browser_dialog_resize.js
new file mode 100644
index 0000000000..8fb05faf2c
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_dialog_resize.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that if the MigrationWizard resizes when opened inside of a
+ * XUL window, that it causes the containing XUL window to resize
+ * appropriately.
+ */
+add_task(async function test_migration_dialog_resize_in_xul_window() {
+  let windowOpened = BrowserTestUtils.domWindowOpened();
+  MigrationUtils.showMigrationWizard(null, {});
+  let dialogWin = await windowOpened;
+
+  await BrowserTestUtils.waitForEvent(dialogWin, "MigrationWizard:Ready");
+
+  let wizard = dialogWin.document.body.querySelector("#wizard");
+  let height = wizard.getBoundingClientRect().height;
+
+  let windowResizePromise = BrowserTestUtils.waitForEvent(dialogWin, "resize");
+  wizard.style.height = height + 100 + "px";
+  await windowResizePromise;
+  Assert.ok(true, "Migration dialog window resized.");
+
+  let dialogClosed = BrowserTestUtils.domWindowClosed(dialogWin);
+  dialogWin.close();
+  await dialogClosed;
+});
diff --git a/browser/components/migration/tests/browser/browser_disabled_migrator.js b/browser/components/migration/tests/browser/browser_disabled_migrator.js
new file mode 100644
index 0000000000..782666f6a6
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_disabled_migrator.js
@@ -0,0 +1,131 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { MigratorBase } = ChromeUtils.importESModule(
+  "resource:///modules/MigratorBase.sys.mjs"
+);
+
+/**
+ * Tests that the InternalTestingProfileMigrator is listed in
+ * the new migration wizard selector when enabled.
+ */
+add_task(async function test_enabled_migrator() {
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let selector = shadow.querySelector("#browser-profile-selector");
+    selector.click();
+
+    await new Promise(resolve => {
+      shadow
+        .querySelector("panel-list")
+        .addEventListener("shown", resolve, { once: true });
+    });
+
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${InternalTestingProfileMigrator.key}"]`
+    );
+
+    Assert.ok(
+      panelItem,
+      "The InternalTestingProfileMigrator panel-item exists."
+    );
+    panelItem.click();
+
+    Assert.ok(
+      selector.innerText.includes("Internal Testing Migrator"),
+      "Testing for enabled internal testing migrator"
+    );
+  });
+});
+
+/**
+ * Tests that the InternalTestingProfileMigrator is not listed in
+ * the new migration wizard selector when disabled.
+ */
+add_task(async function test_disabling_migrator() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.migrate.internal-testing.enabled", false]],
+  });
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let internalTestingMigrator = new InternalTestingProfileMigrator();
+
+  // We create a fake migrator that we know will still be present after
+  // disabling the InternalTestingProfileMigrator so that we don't switch
+  // the wizard to the NO_BROWSERS_FOUND page, which we're not testing here.
+  let fakeMigrator = new FakeMigrator();
+
+  let getMigratorStub = sandbox.stub(MigrationUtils, "getMigrator");
+  getMigratorStub
+    .withArgs("internal-testing")
+    .resolves(internalTestingMigrator);
+  getMigratorStub.withArgs("fake-migrator").resolves(fakeMigrator);
+
+  sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+    return ["internal-testing", "fake-migrator"];
+  });
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let selector = shadow.querySelector("#browser-profile-selector");
+    selector.click();
+
+    await new Promise(resolve => {
+      shadow
+        .querySelector("panel-list")
+        .addEventListener("shown", resolve, { once: true });
+    });
+
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${InternalTestingProfileMigrator.key}"]`
+    );
+
+    Assert.ok(
+      !panelItem,
+      "The panel-item for the InternalTestingProfileMigrator does not exist"
+    );
+  });
+
+  sandbox.restore();
+});
+
+/**
+ * A stub of a migrator used for automated testing only.
+ */
+class FakeMigrator extends MigratorBase {
+  static get key() {
+    return "fake-migrator";
+  }
+
+  static get displayNameL10nID() {
+    return "migration-wizard-migrator-display-name-firefox";
+  }
+
+  // We will create a single MigratorResource for each resource type that
+  // just immediately reports a successful migration.
+  getResources() {
+    return Object.values(MigrationUtils.resourceTypes).map(type => {
+      return {
+        type,
+        migrate: callback => {
+          callback(true /* success */);
+        },
+      };
+    });
+  }
+
+  // We need to override enabled() to always return true for testing purposes.
+  get enabled() {
+    return true;
+  }
+}
diff --git a/browser/components/migration/tests/browser/browser_do_migration.js b/browser/components/migration/tests/browser/browser_do_migration.js
new file mode 100644
index 0000000000..fab9641960
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_do_migration.js
@@ -0,0 +1,209 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that the MigrationWizard can be used to successfully migrate
+ * using the InternalTestingProfileMigrator in a few scenarios.
+ */
+add_task(async function test_successful_migrations() {
+  // Scenario 1: A single resource type is available.
+  let migration = waitForTestMigration(
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    InternalTestingProfileMigrator.testProfile
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let selector = shadow.querySelector("#browser-profile-selector");
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(shadow.activeElement, selector, "Selector should be focused.");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+    ]);
+    await migration;
+    await wizardDone;
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(
+      shadow.activeElement,
+      doneButton,
+      "Done button should be focused."
+    );
+
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+    doneButton.click();
+    await dialogClosed;
+    assertQuantitiesShown(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+    ]);
+  });
+
+  // We should make sure that the migration.time_to_produce_migrator_list
+  // scalar was set, since we know that at least one migration wizard has
+  // been opened.
+  let scalars = TelemetryTestUtils.getProcessScalars("parent", false, false);
+  Assert.ok(
+    scalars["migration.time_to_produce_migrator_list"] > 0,
+    "Non-zero scalar value recorded for migration.time_to_produce_migrator_list"
+  );
+
+  // Scenario 2: Several resource types are available, but only 1
+  // is checked / expected.
+  migration = waitForTestMigration(
+    [
+      MigrationUtils.resourceTypes.BOOKMARKS,
+      MigrationUtils.resourceTypes.PASSWORDS,
+    ],
+    [MigrationUtils.resourceTypes.PASSWORDS],
+    InternalTestingProfileMigrator.testProfile
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let selector = shadow.querySelector("#browser-profile-selector");
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(shadow.activeElement, selector, "Selector should be focused.");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+    ]);
+    await migration;
+    await wizardDone;
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(
+      shadow.activeElement,
+      doneButton,
+      "Done button should be focused."
+    );
+
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+    doneButton.click();
+    await dialogClosed;
+    assertQuantitiesShown(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+    ]);
+  });
+
+  // Scenario 3: Several resource types are available, all are checked.
+  let allResourceTypeStrs = Object.values(
+    MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES
+  ).filter(resourceStr => {
+    return !MigrationWizardConstants.PROFILE_RESET_ONLY_RESOURCE_TYPES[
+      resourceStr
+    ];
+  });
+
+  let allResourceTypes = allResourceTypeStrs.map(resourceTypeStr => {
+    return MigrationUtils.resourceTypes[resourceTypeStr];
+  });
+
+  migration = waitForTestMigration(
+    allResourceTypes,
+    allResourceTypes,
+    InternalTestingProfileMigrator.testProfile
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let selector = shadow.querySelector("#browser-profile-selector");
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(shadow.activeElement, selector, "Selector should be focused.");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, allResourceTypeStrs);
+    await migration;
+    await wizardDone;
+    assertQuantitiesShown(wizard, allResourceTypeStrs);
+  });
+});
+
+/**
+ * Tests that if somehow the Migration Wizard requests to import a
+ * resource type that the migrator doesn't have the ability to import,
+ * that it's ignored and the migration completes normally.
+ */
+add_task(async function test_invalid_resource_type() {
+  let migration = waitForTestMigration(
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    InternalTestingProfileMigrator.testProfile
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    // The Migration Wizard _shouldn't_ display anything except BOOKMARKS,
+    // since that's the only resource type that the selected migrator is
+    // supposed to currently support, but we'll check the other checkboxes
+    // even though they're hidden just to see what happens.
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY,
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA,
+    ]);
+    await migration;
+    await wizardDone;
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(
+      shadow.activeElement,
+      doneButton,
+      "Done button should be focused."
+    );
+
+    assertQuantitiesShown(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+    ]);
+
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+    doneButton.click();
+    await dialogClosed;
+  });
+});
diff --git a/browser/components/migration/tests/browser/browser_entrypoint_telemetry.js b/browser/components/migration/tests/browser/browser_entrypoint_telemetry.js
new file mode 100644
index 0000000000..a1bb23d7fc
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_entrypoint_telemetry.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const HISTOGRAM_ID = "FX_MIGRATION_ENTRY_POINT_CATEGORICAL";
+
+async function showThenCloseMigrationWizardViaEntrypoint(entrypoint) {
+  let openedPromise = BrowserTestUtils.waitForMigrationWizard(window);
+
+  MigrationUtils.showMigrationWizard(window, {
+    entrypoint,
+  });
+
+  let wizardTab = await openedPromise;
+  Assert.ok(wizardTab, "Migration wizard opened.");
+
+  await BrowserTestUtils.removeTab(wizardTab);
+}
+
+add_setup(async () => {
+  // Load the initial tab at example.com. This makes it so that if
+  // when we load the wizard in about:preferences, we'll load the
+  // about:preferences page in a new tab rather than overtaking the
+  // initial one. This makes cleanup of the wizard more explicit, since
+  // we can just close the tab.
+  let browser = gBrowser.selectedBrowser;
+  BrowserTestUtils.startLoadingURIString(browser, "https://example.com");
+  await BrowserTestUtils.browserLoaded(browser);
+});
+
+/**
+ * Tests that the entrypoint passed to MigrationUtils.showMigrationWizard gets
+ * written to both the FX_MIGRATION_ENTRY_POINT_CATEGORICAL histogram.
+ */
+add_task(async function test_entrypoints() {
+  let histogram = TelemetryTestUtils.getAndClearHistogram(HISTOGRAM_ID);
+
+  // Let's arbitrarily pick the "Bookmarks" entrypoint, and make sure this
+  // is recorded.
+  await showThenCloseMigrationWizardViaEntrypoint(
+    MigrationUtils.MIGRATION_ENTRYPOINTS.BOOKMARKS
+  );
+  let entrypointIndex = getEntrypointHistogramIndex(
+    MigrationUtils.MIGRATION_ENTRYPOINTS.BOOKMARKS
+  );
+
+  TelemetryTestUtils.assertHistogram(histogram, entrypointIndex, 1);
+
+  histogram = TelemetryTestUtils.getAndClearHistogram(HISTOGRAM_ID);
+
+  // Now let's pick the "Preferences" entrypoint, and make sure this
+  // is recorded.
+  await showThenCloseMigrationWizardViaEntrypoint(
+    MigrationUtils.MIGRATION_ENTRYPOINTS.PREFERENCES
+  );
+  entrypointIndex = getEntrypointHistogramIndex(
+    MigrationUtils.MIGRATION_ENTRYPOINTS.PREFERENCES
+  );
+
+  TelemetryTestUtils.assertHistogram(histogram, entrypointIndex, 1);
+
+  histogram = TelemetryTestUtils.getAndClearHistogram(HISTOGRAM_ID);
+
+  // Finally, check the fallback by passing in something invalid as an entrypoint.
+  await showThenCloseMigrationWizardViaEntrypoint(undefined);
+  entrypointIndex = getEntrypointHistogramIndex(
+    MigrationUtils.MIGRATION_ENTRYPOINTS.UNKNOWN
+  );
+
+  TelemetryTestUtils.assertHistogram(histogram, entrypointIndex, 1);
+});
diff --git a/browser/components/migration/tests/browser/browser_extension_migration.js b/browser/components/migration/tests/browser/browser_extension_migration.js
new file mode 100644
index 0000000000..e9c3c65e6d
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_extension_migration.js
@@ -0,0 +1,238 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+let gFluentStrings = new Localization([
+  "branding/brand.ftl",
+  "browser/migrationWizard.ftl",
+]);
+
+/**
+ * Ensures that the wizard is on the progress page and that the extension
+ * resource group matches a particular state.
+ *
+ * @param {Element} wizard
+ *   The <migration-wizard> element to inspect.
+ * @param {number} state
+ *   One of the constants from MigrationWizardConstants.PROGRESS_VALUE,
+ *   describing what state the resource group should be in.
+ * @param {object} description
+ *   An object to express more details of how the resource group should be
+ *   displayed.
+ * @param {string} description.message
+ *   The message that should be displayed for the resource group. This message
+ *   maybe be contained in different elements depending on the state.
+ * @param {string} description.linkURL
+ *   The URL for the <a> element that should be displayed to the user for the
+ *   particular state.
+ * @param {string} description.linkText
+ *   The text content for the <a> element that should be displayed to the user
+ *   for the particular state.
+ * @returns {Promise<undefined>}
+ */
+async function assertExtensionsProgressState(wizard, state, description) {
+  let shadow = wizard.openOrClosedShadowRoot;
+
+  // Make sure that we're showing the progress page first.
+  let deck = shadow.querySelector("#wizard-deck");
+  Assert.equal(
+    deck.selectedViewName,
+    `page-${MigrationWizardConstants.PAGES.PROGRESS}`
+  );
+
+  let progressGroup = shadow.querySelector(
+    `.resource-progress-group[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS}"`
+  );
+
+  let progressIcon = progressGroup.querySelector(".progress-icon");
+  let messageText = progressGroup.querySelector("span.message-text");
+  let supportLink = progressGroup.querySelector(".support-text");
+  let extensionsSuccessLink = progressGroup.querySelector(
+    "#extensions-success-link"
+  );
+
+  if (state == MigrationWizardConstants.PROGRESS_VALUE.SUCCESS) {
+    Assert.stringMatches(progressIcon.getAttribute("state"), "success");
+    Assert.stringMatches(messageText.textContent, "");
+    Assert.stringMatches(supportLink.textContent, "");
+    await assertSuccessLink(extensionsSuccessLink, description.message);
+  } else if (state == MigrationWizardConstants.PROGRESS_VALUE.WARNING) {
+    Assert.stringMatches(progressIcon.getAttribute("state"), "warning");
+    Assert.stringMatches(messageText.textContent, description.message);
+    Assert.stringMatches(supportLink.textContent, description.linkText);
+    Assert.stringMatches(supportLink.href, description.linkURL);
+    await assertSuccessLink(extensionsSuccessLink, "");
+  } else if (state == MigrationWizardConstants.PROGRESS_VALUE.INFO) {
+    Assert.stringMatches(progressIcon.getAttribute("state"), "info");
+    Assert.stringMatches(supportLink.textContent, "");
+    await assertSuccessLink(extensionsSuccessLink, description.message);
+  }
+}
+
+/**
+ * Checks that the extensions migration success link has the right
+ * text content, and if the text content is non-blank, ensures that
+ * clicking on the link opens up about:addons in a background tab.
+ *
+ * The about:addons tab will be automatically closed before proceeding.
+ *
+ * @param {Element} link
+ *   The extensions migration success link element.
+ * @param {string} message
+ *   The expected string to appear in the link textContent. If the
+ *   link is not expected to appear, this should be the empty string.
+ * @returns {Promise<undefined>}
+ */
+async function assertSuccessLink(link, message) {
+  Assert.stringMatches(link.textContent, message);
+  if (message) {
+    let aboutAddonsOpened = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      "about:addons"
+    );
+    EventUtils.synthesizeMouseAtCenter(link, {}, link.ownerGlobal);
+    let tab = await aboutAddonsOpened;
+    BrowserTestUtils.removeTab(tab);
+  }
+}
+
+/**
+ * Checks the case where no extensions were matched.
+ */
+add_task(async function test_extension_migration_no_matched_extensions() {
+  let migration = waitForTestMigration(
+    [MigrationUtils.resourceTypes.EXTENSIONS],
+    [MigrationUtils.resourceTypes.EXTENSIONS],
+    InternalTestingProfileMigrator.testProfile,
+    [MigrationUtils.resourceTypes.EXTENSIONS],
+    3 /* totalExtensions */,
+    0 /* matchedExtensions */
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS,
+    ]);
+    await migration;
+    await wizardDone;
+    await assertExtensionsProgressState(
+      wizard,
+      MigrationWizardConstants.PROGRESS_VALUE.WARNING,
+      {
+        message: await gFluentStrings.formatValue(
+          "migration-wizard-progress-no-matched-extensions"
+        ),
+        linkURL: Services.urlFormatter.formatURLPref(
+          "extensions.getAddons.link.url"
+        ),
+        linkText: await gFluentStrings.formatValue(
+          "migration-wizard-progress-extensions-addons-link"
+        ),
+      }
+    );
+  });
+});
+
+/**
+ * Checks the case where some but not all extensions were matched.
+ */
+add_task(
+  async function test_extension_migration_partially_matched_extensions() {
+    const TOTAL_EXTENSIONS = 3;
+    const TOTAL_MATCHES = 1;
+
+    let migration = waitForTestMigration(
+      [MigrationUtils.resourceTypes.EXTENSIONS],
+      [MigrationUtils.resourceTypes.EXTENSIONS],
+      InternalTestingProfileMigrator.testProfile,
+      [],
+      TOTAL_EXTENSIONS,
+      TOTAL_MATCHES
+    );
+
+    await withMigrationWizardDialog(async prefsWin => {
+      let dialogBody = prefsWin.document.body;
+      let wizard = dialogBody.querySelector("migration-wizard");
+
+      let wizardDone = BrowserTestUtils.waitForEvent(
+        wizard,
+        "MigrationWizard:DoneMigration"
+      );
+      selectResourceTypesAndStartMigration(wizard, [
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS,
+      ]);
+      await migration;
+      await wizardDone;
+      await assertExtensionsProgressState(
+        wizard,
+        MigrationWizardConstants.PROGRESS_VALUE.INFO,
+        {
+          message: await gFluentStrings.formatValue(
+            "migration-wizard-progress-partial-success-extensions",
+            {
+              matched: TOTAL_MATCHES,
+              quantity: TOTAL_EXTENSIONS,
+            }
+          ),
+          linkText: await gFluentStrings.formatValue(
+            "migration-wizard-progress-extensions-support-link"
+          ),
+        }
+      );
+    });
+  }
+);
+
+/**
+ * Checks the case where all extensions were matched.
+ */
+add_task(async function test_extension_migration_fully_matched_extensions() {
+  const TOTAL_EXTENSIONS = 15;
+  const TOTAL_MATCHES = TOTAL_EXTENSIONS;
+
+  let migration = waitForTestMigration(
+    [MigrationUtils.resourceTypes.EXTENSIONS],
+    [MigrationUtils.resourceTypes.EXTENSIONS],
+    InternalTestingProfileMigrator.testProfile,
+    [],
+    TOTAL_EXTENSIONS,
+    TOTAL_MATCHES
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS,
+    ]);
+    await migration;
+    await wizardDone;
+    await assertExtensionsProgressState(
+      wizard,
+      MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+      {
+        message: await gFluentStrings.formatValue(
+          "migration-wizard-progress-success-extensions",
+          {
+            quantity: TOTAL_EXTENSIONS,
+          }
+        ),
+        linkURL: "",
+        linkText: "",
+      }
+    );
+  });
+});
diff --git a/browser/components/migration/tests/browser/browser_file_migration.js b/browser/components/migration/tests/browser/browser_file_migration.js
new file mode 100644
index 0000000000..04241d29d5
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_file_migration.js
@@ -0,0 +1,306 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { FileMigratorBase } = ChromeUtils.importESModule(
+  "resource:///modules/FileMigrators.sys.mjs"
+);
+
+const DUMMY_FILEMIGRATOR_KEY = "dummy-file-migrator";
+const DUMMY_FILEPICKER_TITLE = "Some dummy file picker title";
+const DUMMY_FILTER_TITLE = "Some file type";
+const DUMMY_EXTENSION_PATTERN = "*.test";
+const TEST_FILE_PATH = getTestFilePath("dummy_file.csv");
+
+/**
+ * A subclass of FileMigratorBase that doesn't do anything, but
+ * is useful for testing.
+ *
+ * Notably, the `migrate` method is not overridden here. Tests that
+ * use this class should use Sinon to stub out the migrate method.
+ */
+class DummyFileMigrator extends FileMigratorBase {
+  static get key() {
+    return DUMMY_FILEMIGRATOR_KEY;
+  }
+
+  static get displayNameL10nID() {
+    return "migration-wizard-migrator-display-name-file-password-csv";
+  }
+
+  static get brandImage() {
+    return "chrome://branding/content/document.ico";
+  }
+
+  get enabled() {
+    return true;
+  }
+
+  get progressHeaderL10nID() {
+    return "migration-passwords-from-file-progress-header";
+  }
+
+  get successHeaderL10nID() {
+    return "migration-passwords-from-file-success-header";
+  }
+
+  async getFilePickerConfig() {
+    return Promise.resolve({
+      title: DUMMY_FILEPICKER_TITLE,
+      filters: [
+        {
+          title: DUMMY_FILTER_TITLE,
+          extensionPattern: DUMMY_EXTENSION_PATTERN,
+        },
+      ],
+    });
+  }
+
+  get displayedResourceTypes() {
+    return [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS];
+  }
+}
+
+const { MockFilePicker } = SpecialPowers;
+
+add_setup(async () => {
+  // We use MockFilePicker to simulate a native file picker, and prepare it
+  // to return a dummy file pointed at TEST_FILE_PATH. The file at
+  // TEST_FILE_PATH is not required (nor expected) to exist.
+  MockFilePicker.init(window);
+  registerCleanupFunction(() => {
+    MockFilePicker.cleanup();
+  });
+});
+
+/**
+ * Tests the flow of selecting a file migrator (in this case,
+ * the DummyFileMigrator), getting the file picker opened for it,
+ * and then passing the path of the selected file to the migrator.
+ */
+add_task(async function test_file_migration() {
+  let migrator = new DummyFileMigrator();
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  // First, use Sinon to insert our DummyFileMigrator as the only available
+  // file migrator.
+  sandbox.stub(MigrationUtils, "getFileMigrator").callsFake(() => {
+    return migrator;
+  });
+  sandbox.stub(MigrationUtils, "availableFileMigrators").get(() => {
+    return [migrator];
+  });
+
+  // This is the expected success state that our DummyFileMigrator will
+  // return as the final progress update to the migration wizard.
+  const SUCCESS_STATE = {
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]:
+      "2 added",
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED]:
+      "1 updated",
+  };
+
+  let migrateStub = sandbox.stub(migrator, "migrate").callsFake(filePath => {
+    Assert.equal(filePath, TEST_FILE_PATH);
+    return SUCCESS_STATE;
+  });
+
+  let dummyFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
+  dummyFile.initWithPath(TEST_FILE_PATH);
+  let filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      MockFilePicker.setFiles([dummyFile]);
+      resolve();
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnOK;
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    // Now select our DummyFileMigrator from the list.
+    let selector = shadow.querySelector("#browser-profile-selector");
+    selector.click();
+
+    info("Waiting for panel-list shown");
+    await new Promise(resolve => {
+      shadow
+        .querySelector("panel-list")
+        .addEventListener("shown", resolve, { once: true });
+    });
+
+    info("Panel list shown. Clicking on panel-item");
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${DUMMY_FILEMIGRATOR_KEY}"]`
+    );
+    panelItem.click();
+
+    // Selecting a file migrator from the selector should automatically
+    // open the file picker, so we await it here. Once the file is
+    // selected, migration should begin immediately.
+
+    info("Waiting for file picker");
+    await filePickerShownPromise;
+    await wizardDone;
+    Assert.ok(migrateStub.called, "Migrate on DummyFileMigrator was called.");
+
+    // At this point, with migration having completed, we should be showing
+    // the PROGRESS page with the SUCCESS_STATE represented.
+    let deck = shadow.querySelector("#wizard-deck");
+    Assert.equal(
+      deck.selectedViewName,
+      `page-${MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS}`
+    );
+
+    // We expect only the displayed resource types in SUCCESS_STATE are
+    // displayed now.
+    let progressGroups = shadow.querySelectorAll(
+      "div[name='page-file-import-progress'] .resource-progress-group"
+    );
+    for (let progressGroup of progressGroups) {
+      let expectedMessageText =
+        SUCCESS_STATE[progressGroup.dataset.resourceType];
+      if (expectedMessageText) {
+        let progressIcon = progressGroup.querySelector(".progress-icon");
+        Assert.stringMatches(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Should be showing completed state."
+        );
+
+        let messageText =
+          progressGroup.querySelector(".message-text").textContent;
+        Assert.equal(messageText, expectedMessageText);
+      } else {
+        Assert.ok(
+          BrowserTestUtils.isHidden(progressGroup),
+          `Resource progress group for ${progressGroup.dataset.resourceType}` +
+            ` should be hidden.`
+        );
+      }
+    }
+  });
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that the migration wizard will go back to the selection page and
+ * show an error message if the migration for a FileMigrator throws an
+ * exception.
+ */
+add_task(async function test_file_migration_error() {
+  let migrator = new DummyFileMigrator();
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  // First, use Sinon to insert our DummyFileMigrator as the only available
+  // file migrator.
+  sandbox.stub(MigrationUtils, "getFileMigrator").callsFake(() => {
+    return migrator;
+  });
+  sandbox.stub(MigrationUtils, "availableFileMigrators").get(() => {
+    return [migrator];
+  });
+
+  const ERROR_MESSAGE = "This is my error message";
+
+  let migrateStub = sandbox.stub(migrator, "migrate").callsFake(() => {
+    throw new Error(ERROR_MESSAGE);
+  });
+
+  let dummyFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
+  dummyFile.initWithPath(TEST_FILE_PATH);
+  let filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      MockFilePicker.setFiles([dummyFile]);
+      resolve();
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnOK;
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    // Now select our DummyFileMigrator from the list.
+    let selector = shadow.querySelector("#browser-profile-selector");
+    selector.click();
+
+    info("Waiting for panel-list shown");
+    await new Promise(resolve => {
+      shadow
+        .querySelector("panel-list")
+        .addEventListener("shown", resolve, { once: true });
+    });
+
+    info("Panel list shown. Clicking on panel-item");
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${DUMMY_FILEMIGRATOR_KEY}"]`
+    );
+    panelItem.click();
+
+    // Selecting a file migrator from the selector should automatically
+    // open the file picker, so we await it here. Once the file is
+    // selected, migration should begin immediately.
+
+    info("Waiting for file picker");
+    await filePickerShownPromise;
+    await wizardDone;
+    Assert.ok(migrateStub.called, "Migrate on DummyFileMigrator was called.");
+
+    // At this point, with migration having completed, we should be showing
+    // the SELECTION page again with the ERROR_MESSAGE displayed.
+    let deck = shadow.querySelector("#wizard-deck");
+    await BrowserTestUtils.waitForMutationCondition(
+      deck,
+      { attributeFilter: ["selected-view"] },
+      () => {
+        return (
+          deck.getAttribute("selected-view") ==
+          "page-" + MigrationWizardConstants.PAGES.SELECTION
+        );
+      }
+    );
+
+    Assert.equal(
+      selector.selectedPanelItem.getAttribute("key"),
+      DUMMY_FILEMIGRATOR_KEY,
+      "Should have the file migrator selected."
+    );
+
+    let errorMessageContainer = shadow.querySelector(".file-import-error");
+    Assert.ok(
+      BrowserTestUtils.isVisible(errorMessageContainer),
+      "Should be showing the error message container"
+    );
+
+    let fileImportErrorMessage = shadow.querySelector(
+      "#file-import-error-message"
+    ).textContent;
+    Assert.equal(fileImportErrorMessage, ERROR_MESSAGE);
+  });
+
+  sandbox.restore();
+});
diff --git a/browser/components/migration/tests/browser/browser_ie_edge_bookmarks_success_strings.js b/browser/components/migration/tests/browser/browser_ie_edge_bookmarks_success_strings.js
new file mode 100644
index 0000000000..34e8a8de2e
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_ie_edge_bookmarks_success_strings.js
@@ -0,0 +1,89 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that the progress strings that the Migration Wizard shows
+ * during migrations for IE and Edge uses the term "Favorites" rather
+ * then "Bookmarks".
+ */
+add_task(async function test_ie_edge_bookmarks_success_strings() {
+  for (let key of ["ie", "edge", "internal-testing"]) {
+    let sandbox = sinon.createSandbox();
+
+    sandbox.stub(InternalTestingProfileMigrator, "key").get(() => {
+      return key;
+    });
+
+    sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+      return key;
+    });
+
+    let testingMigrator = new InternalTestingProfileMigrator();
+    sandbox.stub(MigrationUtils, "getMigrator").callsFake(() => {
+      return Promise.resolve(testingMigrator);
+    });
+
+    let migration = waitForTestMigration(
+      [MigrationUtils.resourceTypes.BOOKMARKS],
+      [MigrationUtils.resourceTypes.BOOKMARKS],
+      InternalTestingProfileMigrator.testProfile
+    );
+
+    await withMigrationWizardDialog(async prefsWin => {
+      let dialogBody = prefsWin.document.body;
+      let wizard = dialogBody.querySelector("migration-wizard");
+      let wizardDone = BrowserTestUtils.waitForEvent(
+        wizard,
+        "MigrationWizard:DoneMigration"
+      );
+      selectResourceTypesAndStartMigration(
+        wizard,
+        [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS],
+        key
+      );
+      await migration;
+
+      let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+      let shadow = wizard.openOrClosedShadowRoot;
+
+      // If we were using IE or Edge (EdgeHTLM), then the success message should
+      // include the word "favorites". Otherwise, we expect it to include
+      // the word "bookmarks".
+      let bookmarksProgressGroup = shadow.querySelector(
+        `.resource-progress-group[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS}"`
+      );
+      let messageTextElement =
+        bookmarksProgressGroup.querySelector(".message-text");
+
+      await BrowserTestUtils.waitForCondition(() => {
+        return messageTextElement.textContent.trim();
+      });
+
+      let messageText = messageTextElement.textContent.toLowerCase();
+
+      if (key == "internal-testing") {
+        Assert.ok(
+          messageText.includes("bookmarks"),
+          `Message text should refer to bookmarks: ${messageText}.`
+        );
+      } else {
+        Assert.ok(
+          messageText.includes("favorites"),
+          `Message text should refer to favorites: ${messageText}`
+        );
+      }
+
+      let doneButton = shadow.querySelector(
+        "div[name='page-progress'] .done-button"
+      );
+      let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+      doneButton.click();
+      await dialogClosed;
+      await wizardDone;
+    });
+
+    sandbox.restore();
+  }
+});
diff --git a/browser/components/migration/tests/browser/browser_misc_telemetry.js b/browser/components/migration/tests/browser/browser_misc_telemetry.js
new file mode 100644
index 0000000000..4fc6518e49
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_misc_telemetry.js
@@ -0,0 +1,178 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { ChromeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeProfileMigrator.sys.mjs"
+);
+
+/**
+ * Tests that if the migration wizard is opened when the
+ * MOZ_UNINSTALLER_PROFILE_REFRESH environment variable is defined,
+ * that the migration.uninstaller_profile_refresh scalar is set,
+ * and the environment variable is cleared.
+ */
+add_task(async function test_uninstaller_migration() {
+  if (AppConstants.platform != "win") {
+    return;
+  }
+
+  Services.env.set("MOZ_UNINSTALLER_PROFILE_REFRESH", "1");
+  let wizardPromise = BrowserTestUtils.domWindowOpened();
+  // Opening the migration wizard this way is a blocking function, so
+  // we delegate it to a runnable.
+  executeSoon(() => {
+    MigrationUtils.showMigrationWizard(null, { isStartupMigration: true });
+  });
+  let wizardWin = await wizardPromise;
+
+  await BrowserTestUtils.waitForEvent(wizardWin, "MigrationWizard:Ready");
+
+  let scalars = TelemetryTestUtils.getProcessScalars("parent", false, true);
+  TelemetryTestUtils.assertScalar(
+    scalars,
+    "migration.uninstaller_profile_refresh",
+    1
+  );
+
+  Assert.equal(
+    Services.env.get("MOZ_UNINSTALLER_PROFILE_REFRESH"),
+    "",
+    "Cleared MOZ_UNINSTALLER_PROFILE_REFRESH environment variable."
+  );
+  await BrowserTestUtils.closeWindow(wizardWin);
+});
+
+/**
+ * Tests that we populate the migration.discovered_migrators keyed scalar
+ * with a count of discovered browsers and profiles.
+ */
+add_task(async function test_discovered_migrators_keyed_scalar() {
+  Services.telemetry.clearScalars();
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  // We'll pretend that this system only has the
+  // InternalTestingProfileMigrator and ChromeProfileMigrator around to
+  // start
+  sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+    return ["internal-testing", "chrome"];
+  });
+
+  // The InternalTestingProfileMigrator by default returns a single profile
+  // from `getSourceProfiles`, and now we'll just prepare the
+  // ChromeProfileMigrator to return two fake profiles.
+  sandbox.stub(ChromeProfileMigrator.prototype, "getSourceProfiles").resolves([
+    { id: "chrome-test-1", name: "Chrome test profile 1" },
+    { id: "chrome-test-2", name: "Chrome test profile 2" },
+  ]);
+
+  sandbox
+    .stub(ChromeProfileMigrator.prototype, "hasPermissions")
+    .resolves(true);
+
+  // We also need to ensure that the ChromeProfileMigrator actually has
+  // some resources to migrate, otherwise it won't get listed.
+  sandbox
+    .stub(ChromeProfileMigrator.prototype, "getResources")
+    .callsFake(() => {
+      return Promise.resolve(
+        Object.values(MigrationUtils.resourceType).map(resourceType => {
+          return {
+            type: resourceType,
+            migrate: () => {},
+          };
+        })
+      );
+    });
+
+  await withMigrationWizardDialog(async () => {
+    let scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "migration.discovered_migrators",
+      InternalTestingProfileMigrator.key,
+      1
+    );
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "migration.discovered_migrators",
+      ChromeProfileMigrator.key,
+      2
+    );
+  });
+
+  // Now, reset, and we'll try the case where a migrator returns `null` from
+  // `getSourceProfiles` using the InternalTestingProfileMigrator again.
+  sandbox.restore();
+
+  sandbox = sinon.createSandbox();
+
+  sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+    return ["internal-testing"];
+  });
+
+  sandbox
+    .stub(ChromeProfileMigrator.prototype, "getSourceProfiles")
+    .resolves(null);
+
+  await withMigrationWizardDialog(async () => {
+    let scalars = TelemetryTestUtils.getProcessScalars("parent", true, true);
+    TelemetryTestUtils.assertKeyedScalar(
+      scalars,
+      "migration.discovered_migrators",
+      InternalTestingProfileMigrator.key,
+      1
+    );
+  });
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that we write to the FX_MIGRATION_ERRORS histogram when a
+ * resource fails to migrate properly.
+ */
+add_task(async function test_fx_migration_errors() {
+  let migration = waitForTestMigration(
+    [
+      MigrationUtils.resourceTypes.BOOKMARKS,
+      MigrationUtils.resourceTypes.PASSWORDS,
+    ],
+    [
+      MigrationUtils.resourceTypes.BOOKMARKS,
+      MigrationUtils.resourceTypes.PASSWORDS,
+    ],
+    InternalTestingProfileMigrator.testProfile,
+    [MigrationUtils.resourceTypes.PASSWORDS]
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+    ]);
+    await migration;
+    await wizardDone;
+
+    assertQuantitiesShown(
+      wizard,
+      [
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+      ],
+      [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS]
+    );
+  });
+});
diff --git a/browser/components/migration/tests/browser/browser_no_browsers_state.js b/browser/components/migration/tests/browser/browser_no_browsers_state.js
new file mode 100644
index 0000000000..cd4677f31d
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_no_browsers_state.js
@@ -0,0 +1,92 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that the wizard switches to the NO_BROWSERS_FOUND page
+ * when no migrators are detected.
+ */
+add_task(async function test_browser_no_programs() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+    return [];
+  });
+
+  // Let's enable the Passwords CSV import by default so that it appears
+  // as a file migrator.
+  await SpecialPowers.pushPrefEnv({
+    set: [["signon.management.page.fileImport.enabled", true]],
+  });
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let deck = shadow.querySelector("#wizard-deck");
+
+    await BrowserTestUtils.waitForMutationCondition(
+      deck,
+      { attributeFilter: ["selected-view"] },
+      () => {
+        return (
+          deck.getAttribute("selected-view") ==
+          "page-" + MigrationWizardConstants.PAGES.NO_BROWSERS_FOUND
+        );
+      }
+    );
+
+    Assert.ok(
+      true,
+      "Went to no browser page after attempting to search for migrators."
+    );
+    let chooseImportFromFile = shadow.querySelector("#choose-import-from-file");
+    Assert.ok(
+      !chooseImportFromFile.hidden,
+      "Selecting a file migrator should still be possible."
+    );
+  });
+
+  // Now disable all file migrators to make sure that the "Import from file"
+  // button is hidden.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["signon.management.page.fileImport.enabled", false],
+      ["browser.migrate.bookmarks-file.enabled", false],
+    ],
+  });
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let deck = shadow.querySelector("#wizard-deck");
+
+    await BrowserTestUtils.waitForMutationCondition(
+      deck,
+      { attributeFilter: ["selected-view"] },
+      () => {
+        return (
+          deck.getAttribute("selected-view") ==
+          "page-" + MigrationWizardConstants.PAGES.NO_BROWSERS_FOUND
+        );
+      }
+    );
+
+    Assert.ok(
+      true,
+      "Went to no browser page after attempting to search for migrators."
+    );
+    let chooseImportFromFile = shadow.querySelector("#choose-import-from-file");
+    Assert.ok(
+      chooseImportFromFile.hidden,
+      "Selecting a file migrator should not be possible."
+    );
+  });
+
+  sandbox.restore();
+});
diff --git a/browser/components/migration/tests/browser/browser_only_file_migrators.js b/browser/components/migration/tests/browser/browser_only_file_migrators.js
new file mode 100644
index 0000000000..ca18a8c0d5
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_only_file_migrators.js
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that the NO_BROWSERS_FOUND page has a button to redirect to the
+ * selection page when only file migrators are found.
+ */
+add_task(async function test_only_file_migrators() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["signon.management.page.fileImport.enabled", true]],
+  });
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  sandbox.stub(MigrationUtils, "availableMigratorKeys").get(() => {
+    return [];
+  });
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let wizard = dialog.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+    let deck = shadow.querySelector("#wizard-deck");
+
+    await BrowserTestUtils.waitForMutationCondition(
+      deck,
+      { attributeFilter: ["selected-view"] },
+      () => {
+        return (
+          deck.getAttribute("selected-view") ==
+          "page-" + MigrationWizardConstants.PAGES.NO_BROWSERS_FOUND
+        );
+      }
+    );
+
+    let chooseImportFileButton = shadow.querySelector(
+      "#choose-import-from-file"
+    );
+
+    let changedToSelectionPage = BrowserTestUtils.waitForMutationCondition(
+      deck,
+      { attributeFilter: ["selected-view"] },
+      () => {
+        return (
+          deck.getAttribute("selected-view") ==
+          "page-" + MigrationWizardConstants.PAGES.SELECTION
+        );
+      }
+    );
+    chooseImportFileButton.click();
+    await changedToSelectionPage;
+
+    // No browser migrators should be listed.
+    let browserMigratorItems = shadow.querySelectorAll(
+      `panel-item[type="${MigrationWizardConstants.MIGRATOR_TYPES.BROWSER}"]`
+    );
+    Assert.ok(!browserMigratorItems.length, "No browser migrators listed.");
+
+    // Check to make sure there's at least one file migrator listed.
+    let fileMigratorItems = shadow.querySelectorAll(
+      `panel-item[type="${MigrationWizardConstants.MIGRATOR_TYPES.FILE}"]`
+    );
+
+    Assert.ok(!!fileMigratorItems.length, "Listed at least one file migrator.");
+  });
+});
diff --git a/browser/components/migration/tests/browser/browser_permissions.js b/browser/components/migration/tests/browser/browser_permissions.js
new file mode 100644
index 0000000000..35d902bb37
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_permissions.js
@@ -0,0 +1,166 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.migrate.chrome.get_permissions.enabled", true]],
+  });
+});
+
+/**
+ * Tests that the migration wizard can request permission from
+ * the user to read from other browser data directories when
+ * explicit permission needs to be granted.
+ *
+ * This can occur when, for example, Firefox is installed as a
+ * Snap on Ubuntu Linux. In this state, Firefox does not have
+ * direct read access to other browser's data directories (although)
+ * it can tell if they exist. For Chromium-based browsers, this
+ * means we cannot tell what profiles nor resources are available
+ * for Chromium-based browsers without read permissions.
+ *
+ * Note that the Safari migrator is not tested here, as it has
+ * its own special permission flow. This is because we can
+ * determine what resources Safari has before requiring permissions,
+ * and (as of this writing) Safari does not support multiple
+ * user profiles.
+ */
+add_task(async function test_permissions() {
+  Services.telemetry.clearEvents();
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  sandbox
+    .stub(InternalTestingProfileMigrator.prototype, "canGetPermissions")
+    .resolves("/some/path");
+
+  let hasPermissionsStub = sandbox
+    .stub(InternalTestingProfileMigrator.prototype, "hasPermissions")
+    .resolves(false);
+
+  let testingMigrator = await MigrationUtils.getMigrator(
+    InternalTestingProfileMigrator.key
+  );
+  Assert.ok(
+    testingMigrator,
+    "Got migrator, even though we don't yet have permission to read its resources."
+  );
+
+  sandbox.stub(testingMigrator, "getPermissions").callsFake(async () => {
+    testingMigrator.flushResourceCache();
+    hasPermissionsStub.resolves(true);
+    return Promise.resolve(true);
+  });
+
+  let getResourcesStub = sandbox
+    .stub(testingMigrator, "getResources")
+    .resolves([]);
+
+  let migration = waitForTestMigration(
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    [MigrationUtils.resourceTypes.BOOKMARKS],
+    InternalTestingProfileMigrator.testProfile
+  );
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    // Clear out any pre-existing events events have been logged
+    Services.telemetry.clearEvents();
+    TelemetryTestUtils.assertNumberOfEvents(0);
+
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${InternalTestingProfileMigrator.key}"]`
+    );
+    panelItem.click();
+
+    let resourceList = shadow.querySelector(".resource-selection-details");
+    Assert.ok(
+      BrowserTestUtils.isHidden(resourceList),
+      "Resources list is hidden."
+    );
+    let importButton = shadow.querySelector("#import");
+    Assert.ok(BrowserTestUtils.isHidden(importButton), "Import button hidden.");
+    let noPermissionsMessage = shadow.querySelector(".no-permissions-message");
+    Assert.ok(
+      BrowserTestUtils.isVisible(noPermissionsMessage),
+      "No permissions message shown."
+    );
+    let getPermissionButton = shadow.querySelector("#get-permissions");
+    Assert.ok(
+      BrowserTestUtils.isVisible(getPermissionButton),
+      "Get permissions button shown."
+    );
+
+    // Now put the permissions functions back into their default
+    // state - which is the "permission granted" state.
+    getResourcesStub.restore();
+    hasPermissionsStub.restore();
+
+    let refreshDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:Ready"
+    );
+
+    getPermissionButton.click();
+
+    await refreshDone;
+    Assert.ok(true, "Refreshed migrator list.");
+
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+    selectResourceTypesAndStartMigration(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+    ]);
+    await migration;
+    await wizardDone;
+
+    assertQuantitiesShown(wizard, [
+      MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+    ]);
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+
+    await new Promise(resolve => prefsWin.requestAnimationFrame(resolve));
+    Assert.equal(
+      shadow.activeElement,
+      doneButton,
+      "Done button should be focused."
+    );
+
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+    doneButton.click();
+    await dialogClosed;
+  });
+
+  TelemetryTestUtils.assertEvents(
+    [
+      {
+        category: "browser.migration",
+        method: "linux_perms",
+        object: "wizard",
+        value: null,
+        extra: {
+          migrator_key: InternalTestingProfileMigrator.key,
+        },
+      },
+    ],
+    {
+      category: "browser.migration",
+      method: "linux_perms",
+      object: "wizard",
+    }
+  );
+});
diff --git a/browser/components/migration/tests/browser/browser_safari_passwords.js b/browser/components/migration/tests/browser/browser_safari_passwords.js
new file mode 100644
index 0000000000..c005342b46
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_safari_passwords.js
@@ -0,0 +1,468 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { SafariProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/SafariProfileMigrator.sys.mjs"
+);
+const { LoginCSVImport } = ChromeUtils.importESModule(
+  "resource://gre/modules/LoginCSVImport.sys.mjs"
+);
+
+const TEST_FILE_PATH = getTestFilePath("dummy_file.csv");
+
+// We use MockFilePicker to simulate a native file picker, and prepare it
+// to return a dummy file pointed at TEST_FILE_PATH. The file at
+// TEST_FILE_PATH is not required (nor expected) to exist.
+const { MockFilePicker } = SpecialPowers;
+
+add_setup(async function () {
+  MockFilePicker.init(window);
+  registerCleanupFunction(() => {
+    MockFilePicker.cleanup();
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [["signon.management.page.fileImport.enabled", true]],
+  });
+});
+
+/**
+ * A helper function that does most of the heavy lifting for the tests in
+ * this file. Specfically, it takes care of:
+ *
+ * 1. Stubbing out the various hunks of the SafariProfileMigrator in order
+ *    to simulate a migration without actually performing one, since the
+ *    migrator itself isn't being tested here.
+ * 2. Stubbing out parts of MigrationUtils and LoginCSVImport to have a
+ *    consistent reporting on how many things are imported.
+ * 3. Setting up the MockFilePicker if expectsFilePicker is true to return
+ *    the TEST_FILE_PATH.
+ * 4. Opens up the migration wizard, and chooses to import both BOOKMARKS
+ *    and PASSWORDS, and then clicks "Import".
+ * 5. Waits for the migration wizard to show the Safari password import
+ *    instructions.
+ * 6. Runs taskFn
+ * 7. Closes the migration dialog.
+ *
+ * @param {boolean} expectsFilePicker
+ *   True if the MockFilePicker should be set up to return TEST_FILE_PATH.
+ * @param {boolean} migrateBookmarks
+ *   True if bookmarks should be migrated alongside passwords. If not, only
+ *   passwords will be migrated.
+ * @param {boolean} shouldPasswordImportFail
+ *   True if importing from the CSV file should fail.
+ * @param {Function} taskFn
+ *   An asynchronous function that takes the following parameters in this
+ *   order:
+ *
+ *    {Element} wizard
+ *      The opened migration wizard
+ *    {Promise} filePickerShownPromise
+ *      A Promise that resolves once the MockFilePicker has closed. This is
+ *      undefined if expectsFilePicker was false.
+ *    {object} importFromCSVStub
+ *      The Sinon stub object for LoginCSVImport.importFromCSV. This can be
+ *      used to check to see whether it was called.
+ *    {Promise} didMigration
+ *      A Promise that resolves to true once the migration completes.
+ *    {Promise} wizardDone
+ *      A Promise that resolves once the migration wizard reports that a
+ *      migration has completed.
+ * @returns {Promise<undefined>}
+ */
+async function testSafariPasswordHelper(
+  expectsFilePicker,
+  migrateBookmarks,
+  shouldPasswordImportFail,
+  taskFn
+) {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let safariMigrator = new SafariProfileMigrator();
+  sandbox.stub(MigrationUtils, "getMigrator").resolves(safariMigrator);
+
+  // We're not testing the permission flow here, so let's pretend that we
+  // always have permission to read resources from the disk.
+  sandbox
+    .stub(SafariProfileMigrator.prototype, "hasPermissions")
+    .resolves(true);
+
+  // Have the migrator claim that only BOOKMARKS are only available.
+  sandbox
+    .stub(SafariProfileMigrator.prototype, "getMigrateData")
+    .resolves(MigrationUtils.resourceTypes.BOOKMARKS);
+
+  let migrateStub;
+  let didMigration = new Promise(resolve => {
+    migrateStub = sandbox
+      .stub(SafariProfileMigrator.prototype, "migrate")
+      .callsFake((aResourceTypes, aStartup, aProfile, aProgressCallback) => {
+        if (!migrateBookmarks) {
+          Assert.ok(
+            false,
+            "Should not have called migrate when only migrating Safari passwords."
+          );
+        }
+
+        Assert.ok(
+          !aStartup,
+          "Migrator should not have been called as a startup migration."
+        );
+        Assert.ok(
+          aResourceTypes & MigrationUtils.resourceTypes.BOOKMARKS,
+          "Should have requested to migrate the BOOKMARKS resource."
+        );
+        Assert.ok(
+          !(aResourceTypes & MigrationUtils.resourceTypes.PASSWORDS),
+          "Should not have requested to migrate the PASSWORDS resource."
+        );
+
+        aProgressCallback(MigrationUtils.resourceTypes.BOOKMARKS, true);
+        Services.obs.notifyObservers(null, "Migration:Ended");
+        resolve();
+      });
+  });
+
+  // We'll pretend we added EXPECTED_QUANTITY passwords from the Safari
+  // password file.
+  let results = [];
+  for (let i = 0; i < EXPECTED_QUANTITY; ++i) {
+    results.push({ result: "added" });
+  }
+  let importFromCSVStub = sandbox.stub(LoginCSVImport, "importFromCSV");
+
+  if (shouldPasswordImportFail) {
+    importFromCSVStub.rejects(new Error("Some error message"));
+  } else {
+    importFromCSVStub.resolves(results);
+  }
+
+  sandbox.stub(MigrationUtils, "_importQuantities").value({
+    bookmarks: EXPECTED_QUANTITY,
+  });
+
+  let filePickerShownPromise;
+
+  if (expectsFilePicker) {
+    MockFilePicker.reset();
+
+    let dummyFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
+    dummyFile.initWithPath(TEST_FILE_PATH);
+    filePickerShownPromise = new Promise(resolve => {
+      MockFilePicker.showCallback = () => {
+        Assert.ok(true, "Filepicker shown.");
+        MockFilePicker.setFiles([dummyFile]);
+        resolve();
+      };
+    });
+    MockFilePicker.returnValue = MockFilePicker.returnOK;
+  }
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    info("Choosing Safari");
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${SafariProfileMigrator.key}"]`
+    );
+    panelItem.click();
+
+    let resourceTypeList = shadow.querySelector("#resource-type-list");
+
+    // Let's choose whether to import BOOKMARKS first.
+    let bookmarksNode = resourceTypeList.querySelector(
+      `label[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS}"]`
+    );
+    bookmarksNode.control.checked = migrateBookmarks;
+
+    // Let's make sure that PASSWORDS is displayed despite the migrator only
+    // (currently) returning BOOKMARKS as an available resource to migrate.
+    let passwordsNode = resourceTypeList.querySelector(
+      `label[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS}"]`
+    );
+    Assert.ok(
+      !passwordsNode.hidden,
+      "PASSWORDS should be available to import from."
+    );
+    passwordsNode.control.checked = true;
+
+    let deck = shadow.querySelector("#wizard-deck");
+    let switchedToSafariPermissionPage =
+      BrowserTestUtils.waitForMutationCondition(
+        deck,
+        { attributeFilter: ["selected-view"] },
+        () => {
+          return (
+            deck.getAttribute("selected-view") ==
+            "page-" + MigrationWizardConstants.PAGES.SAFARI_PASSWORD_PERMISSION
+          );
+        }
+      );
+
+    let importButton = shadow.querySelector("#import");
+    importButton.click();
+    await switchedToSafariPermissionPage;
+    Assert.ok(true, "Went to Safari permission page after attempting import.");
+
+    await taskFn(
+      wizard,
+      filePickerShownPromise,
+      importFromCSVStub,
+      didMigration,
+      migrateStub,
+      wizardDone
+    );
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+
+    doneButton.click();
+    await dialogClosed;
+  });
+
+  sandbox.restore();
+  MockFilePicker.reset();
+}
+
+/**
+ * Tests the flow of importing passwords from Safari via an
+ * exported CSV file.
+ */
+add_task(async function test_safari_password_do_import() {
+  await testSafariPasswordHelper(
+    true,
+    true,
+    false,
+    async (
+      wizard,
+      filePickerShownPromise,
+      importFromCSVStub,
+      didMigration,
+      migrateStub,
+      wizardDone
+    ) => {
+      let shadow = wizard.openOrClosedShadowRoot;
+      let safariPasswordImportSelect = shadow.querySelector(
+        "#safari-password-import-select"
+      );
+      safariPasswordImportSelect.click();
+      await filePickerShownPromise;
+      Assert.ok(true, "File picker was shown.");
+
+      await didMigration;
+      Assert.ok(importFromCSVStub.called, "Importing from CSV was called.");
+
+      await wizardDone;
+
+      assertQuantitiesShown(wizard, [
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+      ]);
+    }
+  );
+});
+
+/**
+ * Tests that only passwords get imported if the user only opts
+ * to import passwords, and that nothing else gets imported.
+ */
+add_task(async function test_safari_password_only_do_import() {
+  await testSafariPasswordHelper(
+    true,
+    false,
+    false,
+    async (
+      wizard,
+      filePickerShownPromise,
+      importFromCSVStub,
+      didMigration,
+      migrateStub,
+      wizardDone
+    ) => {
+      let shadow = wizard.openOrClosedShadowRoot;
+      let safariPasswordImportSelect = shadow.querySelector(
+        "#safari-password-import-select"
+      );
+      safariPasswordImportSelect.click();
+      await filePickerShownPromise;
+      Assert.ok(true, "File picker was shown.");
+
+      await wizardDone;
+
+      assertQuantitiesShown(wizard, [
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+      ]);
+
+      Assert.ok(importFromCSVStub.called, "Importing from CSV was called.");
+      Assert.ok(
+        !migrateStub.called,
+        "SafariProfileMigrator.migrate was not called."
+      );
+    }
+  );
+});
+
+/**
+ * Tests the flow of importing passwords from Safari when the file
+ * import fails.
+ */
+add_task(async function test_safari_password_empty_csv_file() {
+  await testSafariPasswordHelper(
+    true,
+    true,
+    true,
+    async (
+      wizard,
+      filePickerShownPromise,
+      importFromCSVStub,
+      didMigration,
+      migrateStub,
+      wizardDone
+    ) => {
+      let shadow = wizard.openOrClosedShadowRoot;
+      let safariPasswordImportSelect = shadow.querySelector(
+        "#safari-password-import-select"
+      );
+      safariPasswordImportSelect.click();
+      await filePickerShownPromise;
+      Assert.ok(true, "File picker was shown.");
+
+      await didMigration;
+      Assert.ok(importFromCSVStub.called, "Importing from CSV was called.");
+
+      await wizardDone;
+
+      let headerL10nID =
+        shadow.querySelector("#progress-header").dataset.l10nId;
+      Assert.equal(
+        headerL10nID,
+        "migration-wizard-progress-done-with-warnings-header"
+      );
+
+      let progressGroup = shadow.querySelector(
+        `.resource-progress-group[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS}"`
+      );
+      let progressIcon = progressGroup.querySelector(".progress-icon");
+      let messageText =
+        progressGroup.querySelector(".message-text").textContent;
+
+      Assert.equal(
+        progressIcon.getAttribute("state"),
+        "warning",
+        "Icon should be in the warning state."
+      );
+      Assert.stringMatches(
+        messageText,
+        /file doesn’t include any valid password data/
+      );
+    }
+  );
+});
+
+/**
+ * Tests that the user can skip importing passwords from Safari.
+ */
+add_task(async function test_safari_password_skip() {
+  await testSafariPasswordHelper(
+    false,
+    true,
+    false,
+    async (
+      wizard,
+      filePickerShownPromise,
+      importFromCSVStub,
+      didMigration,
+      migrateStub,
+      wizardDone
+    ) => {
+      let shadow = wizard.openOrClosedShadowRoot;
+      let safariPasswordImportSkip = shadow.querySelector(
+        "#safari-password-import-skip"
+      );
+      safariPasswordImportSkip.click();
+
+      await didMigration;
+      Assert.ok(!MockFilePicker.shown, "Never showed the file picker.");
+      Assert.ok(
+        !importFromCSVStub.called,
+        "Importing from CSV was never called."
+      );
+
+      await wizardDone;
+
+      assertQuantitiesShown(wizard, [
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+      ]);
+    }
+  );
+});
+
+/**
+ * Tests that importing from passwords for Safari doesn't exist if
+ * signon.management.page.fileImport.enabled is false.
+ */
+add_task(async function test_safari_password_disabled() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["signon.management.page.fileImport.enabled", false]],
+  });
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let safariMigrator = new SafariProfileMigrator();
+  sandbox.stub(MigrationUtils, "getMigrator").resolves(safariMigrator);
+
+  // We're not testing the permission flow here, so let's pretend that we
+  // always have permission to read resources from the disk.
+  sandbox
+    .stub(SafariProfileMigrator.prototype, "hasPermissions")
+    .resolves(true);
+
+  // Have the migrator claim that only BOOKMARKS are only available.
+  sandbox
+    .stub(SafariProfileMigrator.prototype, "getMigrateData")
+    .resolves(MigrationUtils.resourceTypes.BOOKMARKS);
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    info("Choosing Safari");
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${SafariProfileMigrator.key}"]`
+    );
+    panelItem.click();
+
+    let resourceTypeList = shadow.querySelector("#resource-type-list");
+
+    // Let's make sure that PASSWORDS is displayed despite the migrator only
+    // (currently) returning BOOKMARKS as an available resource to migrate.
+    let passwordsNode = resourceTypeList.querySelector(
+      `label[data-resource-type="${MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS}"]`
+    );
+    Assert.ok(
+      passwordsNode.hidden,
+      "PASSWORDS should not be available to import from."
+    );
+  });
+
+  await SpecialPowers.popPrefEnv();
+});
diff --git a/browser/components/migration/tests/browser/browser_safari_permissions.js b/browser/components/migration/tests/browser/browser_safari_permissions.js
new file mode 100644
index 0000000000..bac56866f0
--- /dev/null
+++ b/browser/components/migration/tests/browser/browser_safari_permissions.js
@@ -0,0 +1,136 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { SafariProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/SafariProfileMigrator.sys.mjs"
+);
+
+/**
+ * Tests that if we don't have permission to read the contents
+ * of ~/Library/Safari, that we can ask for permission to do that.
+ *
+ * This involves presenting the user with some instructions, and then
+ * showing a native folder picker for the user to select the
+ * ~/Library/Safari folder. This seems to give us read access to the
+ * folder contents.
+ *
+ * Revoking permissions for reading the ~/Library/Safari folder is
+ * not something that we know how to do just yet. It seems to be
+ * something involving macOS's System Integrity Protection. This test
+ * mocks out and simulates the actual permissions mechanism to make
+ * this test run reliably and repeatably.
+ */
+add_task(async function test_safari_permissions() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let hasPermissionsStub = sandbox
+    .stub(SafariProfileMigrator.prototype, "hasPermissions")
+    .resolves(false);
+
+  let safariMigrator = await MigrationUtils.getMigrator(
+    SafariProfileMigrator.key
+  );
+  Assert.ok(
+    safariMigrator,
+    "Got migrator, even though we don't yet have permission to read its resources."
+  );
+
+  sandbox.stub(MigrationUtils, "getMigrator").resolves(safariMigrator);
+
+  sandbox.stub(safariMigrator, "getPermissions").callsFake(async () => {
+    hasPermissionsStub.resolves(true);
+    return Promise.resolve(true);
+  });
+
+  sandbox.stub(safariMigrator, "getResources").callsFake(() => {
+    return Promise.resolve([
+      {
+        type: MigrationUtils.resourceTypes.BOOKMARKS,
+        migrate: () => {},
+      },
+    ]);
+  });
+
+  let didMigration = new Promise(resolve => {
+    sandbox
+      .stub(safariMigrator, "migrate")
+      .callsFake((aResourceTypes, aStartup, aProfile, aProgressCallback) => {
+        Assert.ok(
+          !aStartup,
+          "Migrator should not have been called as a startup migration."
+        );
+
+        aProgressCallback(MigrationUtils.resourceTypes.BOOKMARKS);
+        Services.obs.notifyObservers(null, "Migration:Ended");
+        resolve();
+      });
+  });
+
+  await withMigrationWizardDialog(async prefsWin => {
+    let dialogBody = prefsWin.document.body;
+    let wizard = dialogBody.querySelector("migration-wizard");
+    let wizardDone = BrowserTestUtils.waitForEvent(
+      wizard,
+      "MigrationWizard:DoneMigration"
+    );
+
+    let shadow = wizard.openOrClosedShadowRoot;
+
+    info("Choosing Safari");
+    let panelItem = shadow.querySelector(
+      `panel-item[key="${SafariProfileMigrator.key}"]`
+    );
+    panelItem.click();
+
+    // Let's just choose "Bookmarks" for now.
+    let resourceTypeList = shadow.querySelector("#resource-type-list");
+    let resourceNodes = resourceTypeList.querySelectorAll(
+      `label[data-resource-type]`
+    );
+    for (let resourceNode of resourceNodes) {
+      resourceNode.control.checked =
+        resourceNode.dataset.resourceType ==
+        MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS;
+    }
+
+    let deck = shadow.querySelector("#wizard-deck");
+    let switchedToSafariPermissionPage =
+      BrowserTestUtils.waitForMutationCondition(
+        deck,
+        { attributeFilter: ["selected-view"] },
+        () => {
+          return (
+            deck.getAttribute("selected-view") ==
+            "page-" + MigrationWizardConstants.PAGES.SAFARI_PERMISSION
+          );
+        }
+      );
+
+    let importButton = shadow.querySelector("#import");
+    importButton.click();
+    await switchedToSafariPermissionPage;
+    Assert.ok(true, "Went to Safari permission page after attempting import.");
+
+    let requestPermissions = shadow.querySelector(
+      "#safari-request-permissions"
+    );
+    requestPermissions.click();
+    await didMigration;
+    Assert.ok(true, "Completed migration");
+
+    let dialog = prefsWin.document.querySelector("#migrationWizardDialog");
+    let doneButton = shadow.querySelector(
+      "div[name='page-progress'] .done-button"
+    );
+    let dialogClosed = BrowserTestUtils.waitForEvent(dialog, "close");
+
+    doneButton.click();
+    await dialogClosed;
+    await wizardDone;
+  });
+});
diff --git a/browser/components/migration/tests/browser/dummy_file.csv b/browser/components/migration/tests/browser/dummy_file.csv
new file mode 100644
index 0000000000..48a099ab76
--- /dev/null
+++ b/browser/components/migration/tests/browser/dummy_file.csv
@@ -0,0 +1 @@
+This file intentionally left blank.
\ No newline at end of file
diff --git a/browser/components/migration/tests/browser/head.js b/browser/components/migration/tests/browser/head.js
new file mode 100644
index 0000000000..d3d188a7e1
--- /dev/null
+++ b/browser/components/migration/tests/browser/head.js
@@ -0,0 +1,534 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* import-globals-from ../head-common.js */
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/browser/components/migration/tests/browser/head-common.js",
+  this
+);
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+const { InternalTestingProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/InternalTestingProfileMigrator.sys.mjs"
+);
+const { TelemetryTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TelemetryTestUtils.sys.mjs"
+);
+
+const DIALOG_URL =
+  "chrome://browser/content/migration/migration-dialog-window.html";
+
+/**
+ * We'll have this be our magic number of quantities of various imports.
+ * We will use Sinon to prepare MigrationUtils to presume that this was
+ * how many of each quantity-supported resource type was imported.
+ */
+const EXPECTED_QUANTITY = 123;
+
+/**
+ * These are the resource types that currently display their import success
+ * message with a quantity.
+ */
+const RESOURCE_TYPES_WITH_QUANTITIES = [
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS,
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY,
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS,
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA,
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PAYMENT_METHODS,
+  MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS,
+];
+
+/**
+ * The withMigrationWizardDialog callback, called after the
+ * dialog has loaded and the wizard is ready.
+ *
+ * @callback withMigrationWizardDialogCallback
+ * @param {DOMWindow} window
+ *   The content window of the migration wizard subdialog frame.
+ * @returns {Promise<undefined>}
+ */
+
+/**
+ * Opens the migration wizard HTML5 dialog in about:preferences in the
+ * current window's selected tab, runs an async taskFn, and then
+ * cleans up by loading about:blank in the tab before resolving.
+ *
+ * @param {withMigrationWizardDialogCallback} taskFn
+ *   An async test function to be called while the migration wizard
+ *   dialog is open.
+ * @returns {Promise<undefined>}
+ */
+async function withMigrationWizardDialog(taskFn) {
+  let migrationDialogPromise = waitForMigrationWizardDialogTab();
+  await MigrationUtils.showMigrationWizard(window, {});
+  let prefsBrowser = await migrationDialogPromise;
+
+  try {
+    await taskFn(prefsBrowser.contentWindow);
+  } finally {
+    if (gBrowser.tabs.length > 1) {
+      BrowserTestUtils.removeTab(gBrowser.getTabForBrowser(prefsBrowser));
+    } else {
+      BrowserTestUtils.startLoadingURIString(prefsBrowser, "about:blank");
+      await BrowserTestUtils.browserLoaded(prefsBrowser);
+    }
+  }
+}
+
+/**
+ * Returns a Promise that resolves when an about:preferences tab opens
+ * in the current window which loads the migration wizard dialog.
+ * The Promise will wait until the migration wizard reports that it
+ * is ready with the "MigrationWizard:Ready" event.
+ *
+ * @returns {Promise<browser>}
+ *   Resolves with the about:preferences browser element.
+ */
+async function waitForMigrationWizardDialogTab() {
+  let wizardReady = BrowserTestUtils.waitForEvent(
+    window,
+    "MigrationWizard:Ready"
+  );
+
+  let tab;
+  if (gBrowser.selectedTab.isEmpty) {
+    tab = gBrowser.selectedTab;
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, url => {
+      return url.startsWith("about:preferences");
+    });
+  } else {
+    tab = await BrowserTestUtils.waitForNewTab(gBrowser, url => {
+      return url.startsWith("about:preferences");
+    });
+  }
+
+  await wizardReady;
+  info("Done waiting - migration subdialog loaded and ready.");
+
+  return tab.linkedBrowser;
+}
+
+/**
+ * A helper function that prepares the InternalTestingProfileMigrator
+ * with some set of fake available resources, and resolves a Promise
+ * when the InternalTestingProfileMigrator is used for a migration.
+ *
+ * @param {number[]} availableResourceTypes
+ *   An array of resource types from MigrationUtils.resourcesTypes.
+ *   A single MigrationResource will be created per type, with a
+ *   no-op migrate function.
+ * @param {number[]} expectedResourceTypes
+ *   An array of resource types from MigrationUtils.resourceTypes.
+ *   These are the resource types that are expected to be passed
+ *   to the InternalTestingProfileMigrator.migrate function.
+ * @param {object|string} expectedProfile
+ *   The profile object or string that is expected to be passed
+ *   to the InternalTestingProfileMigrator.migrate function.
+ * @param {number[]} [errorResourceTypes=[]]
+ *   Resource types that we should pretend have failed to complete
+ *   their migration properly.
+ * @param {number} [totalExtensions=1]
+ *   If migrating extensions, the total that should be reported to
+ *   have been found from the source browser.
+ * @param {number} [matchedExtensions=1]
+ *   If migrating extensions, the number of extensions that should
+ *   be reported as having equivalent matches for this browser.
+ * @returns {Promise<undefined>}
+ */
+async function waitForTestMigration(
+  availableResourceTypes,
+  expectedResourceTypes,
+  expectedProfile,
+  errorResourceTypes = [],
+  totalExtensions = 1,
+  matchedExtensions = 1
+) {
+  let sandbox = sinon.createSandbox();
+  let sourceHistogram = TelemetryTestUtils.getAndClearHistogram(
+    "FX_MIGRATION_SOURCE_BROWSER"
+  );
+  let usageHistogram =
+    TelemetryTestUtils.getAndClearKeyedHistogram("FX_MIGRATION_USAGE");
+  let errorHistogram = TelemetryTestUtils.getAndClearKeyedHistogram(
+    "FX_MIGRATION_ERRORS"
+  );
+
+  // Fake out the getResources method of the migrator so that we return
+  // a single fake MigratorResource per availableResourceType.
+  sandbox
+    .stub(InternalTestingProfileMigrator.prototype, "getResources")
+    .callsFake(aProfile => {
+      Assert.deepEqual(
+        aProfile,
+        expectedProfile,
+        "Should have gotten the expected profile."
+      );
+      return Promise.resolve(
+        availableResourceTypes.map(resourceType => {
+          return {
+            type: resourceType,
+            migrate: () => {},
+          };
+        })
+      );
+    });
+
+  sandbox.stub(MigrationUtils, "_importQuantities").value({
+    bookmarks: EXPECTED_QUANTITY,
+    history: EXPECTED_QUANTITY,
+    logins: EXPECTED_QUANTITY,
+    cards: EXPECTED_QUANTITY,
+  });
+
+  sandbox
+    .stub(MigrationUtils, "getSourceIdForTelemetry")
+    .withArgs(InternalTestingProfileMigrator.key)
+    .returns(InternalTestingProfileMigrator.sourceID);
+
+  // Fake out the migrate method of the migrator and assert that the
+  // next time it's called, its arguments match our expectations.
+  return new Promise(resolve => {
+    sandbox
+      .stub(InternalTestingProfileMigrator.prototype, "migrate")
+      .callsFake((aResourceTypes, aStartup, aProfile, aProgressCallback) => {
+        Assert.ok(
+          !aStartup,
+          "Migrator should not have been called as a startup migration."
+        );
+
+        let bitMask = 0;
+        for (let resourceType of expectedResourceTypes) {
+          bitMask |= resourceType;
+        }
+
+        Assert.deepEqual(
+          aResourceTypes,
+          bitMask,
+          "Got the expected resource types"
+        );
+        Assert.deepEqual(
+          aProfile,
+          expectedProfile,
+          "Got the expected profile object"
+        );
+
+        for (let resourceType of expectedResourceTypes) {
+          let shouldError = errorResourceTypes.includes(resourceType);
+          if (
+            resourceType == MigrationUtils.resourceTypes.EXTENSIONS &&
+            !shouldError
+          ) {
+            let progressValue;
+            if (totalExtensions == matchedExtensions) {
+              progressValue = MigrationWizardConstants.PROGRESS_VALUE.SUCCESS;
+            } else if (
+              totalExtensions > matchedExtensions &&
+              matchedExtensions
+            ) {
+              progressValue = MigrationWizardConstants.PROGRESS_VALUE.INFO;
+            } else {
+              Assert.ok(
+                false,
+                "Total and matched extensions should be greater than 0 on success." +
+                  `Total: ${totalExtensions}, Matched: ${matchedExtensions}`
+              );
+            }
+            aProgressCallback(resourceType, !shouldError, {
+              totalExtensions: Array(totalExtensions),
+              importedExtensions: Array(matchedExtensions),
+              progressValue,
+            });
+          } else {
+            aProgressCallback(resourceType, !shouldError);
+          }
+        }
+
+        let usageHistogramSnapshot =
+          usageHistogram.snapshot()[InternalTestingProfileMigrator.key];
+
+        let errorHistogramSnapshot =
+          errorHistogram.snapshot()[InternalTestingProfileMigrator.key];
+
+        for (let resourceTypeName in MigrationUtils.resourceTypes) {
+          let resourceType = MigrationUtils.resourceTypes[resourceTypeName];
+          if (resourceType == MigrationUtils.resourceTypes.ALL) {
+            continue;
+          }
+
+          if (expectedResourceTypes.includes(resourceType)) {
+            Assert.equal(
+              usageHistogramSnapshot.values[Math.log2(resourceType)],
+              1,
+              `Should have set resource type ${resourceTypeName} on the FX_MIGRATION_USAGE keyed histogram.`
+            );
+
+            if (errorResourceTypes.includes(resourceType)) {
+              Assert.equal(
+                errorHistogramSnapshot.values[Math.log2(resourceType)],
+                1,
+                `Should have set resource type ${resourceTypeName} on the FX_MIGRATION_ERRORS keyed histogram.`
+              );
+            }
+          } else {
+            let value = usageHistogramSnapshot.values[Math.log2(resourceType)];
+            Assert.ok(
+              value === 0 || value === undefined,
+              `Should not have set resource type ${resourceTypeName} on the FX_MIGRATION_USAGE keyed histogram.`
+            );
+          }
+        }
+
+        Services.obs.notifyObservers(null, "Migration:Ended");
+
+        TelemetryTestUtils.assertHistogram(
+          sourceHistogram,
+          InternalTestingProfileMigrator.sourceID,
+          1
+        );
+
+        resolve();
+      });
+  }).finally(async () => {
+    sandbox.restore();
+
+    // MigratorBase caches resources fetched by the getResources method
+    // as a performance optimization. In order to allow different tests
+    // to have different available resources, we call into a special
+    // method of InternalTestingProfileMigrator that clears that
+    // cache.
+    let migrator = await MigrationUtils.getMigrator(
+      InternalTestingProfileMigrator.key
+    );
+    migrator.flushResourceCache();
+  });
+}
+
+/**
+ * Takes a MigrationWizard element and chooses the
+ * InternalTestingProfileMigrator as the browser to migrate from. Then, it
+ * checks the checkboxes associated with the selectedResourceTypes and
+ * unchecks the rest before clicking the "Import" button.
+ *
+ * @param {Element} wizard
+ *   The MigrationWizard element.
+ * @param {string[]} selectedResourceTypes
+ *   An array of resource type strings from
+ *   MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.
+ * @param {string} [migratorKey=InternalTestingProfileMigrator.key]
+ *   The key for the migrator to use. Defaults to the
+ *   InternalTestingProfileMigrator.
+ */
+async function selectResourceTypesAndStartMigration(
+  wizard,
+  selectedResourceTypes,
+  migratorKey = InternalTestingProfileMigrator.key
+) {
+  let shadow = wizard.openOrClosedShadowRoot;
+
+  // First, select the InternalTestingProfileMigrator browser.
+  let selector = shadow.querySelector("#browser-profile-selector");
+  selector.click();
+
+  await new Promise(resolve => {
+    shadow
+      .querySelector("panel-list")
+      .addEventListener("shown", resolve, { once: true });
+  });
+
+  let panelItem = shadow.querySelector(`panel-item[key="${migratorKey}"]`);
+  panelItem.click();
+
+  // And then check the right checkboxes for the resource types.
+  let resourceTypeList = shadow.querySelector("#resource-type-list");
+  for (let resourceType of getChoosableResourceTypes()) {
+    let node = resourceTypeList.querySelector(
+      `label[data-resource-type="${resourceType}"]`
+    );
+    node.control.checked = selectedResourceTypes.includes(resourceType);
+  }
+
+  let importButton = shadow.querySelector("#import");
+  importButton.click();
+}
+
+/**
+ * Assert that the resource types passed in expectedResourceTypes are
+ * showing a success state after a migration, and if they are part of
+ * the RESOURCE_TYPES_WITH_QUANTITIES group, that they're showing the
+ * EXPECTED_QUANTITY magic number in their success message. Otherwise,
+ * we (currently) check that they show the empty string.
+ *
+ * @param {Element} wizard
+ *   The MigrationWizard element.
+ * @param {string[]} expectedResourceTypes
+ *   An array of resource type strings from
+ *   MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.
+ * @param {string[]} [warningResourceTypes=[]]
+ *   An array of resource type strings from
+ *   MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES. These
+ *   are the resources that should be showing a warning message.
+ */
+function assertQuantitiesShown(
+  wizard,
+  expectedResourceTypes,
+  warningResourceTypes = []
+) {
+  let shadow = wizard.openOrClosedShadowRoot;
+
+  // Make sure that we're showing the progress page first.
+  let deck = shadow.querySelector("#wizard-deck");
+  Assert.equal(
+    deck.selectedViewName,
+    `page-${MigrationWizardConstants.PAGES.PROGRESS}`
+  );
+
+  let headerL10nID = shadow.querySelector("#progress-header").dataset.l10nId;
+  if (warningResourceTypes.length) {
+    Assert.equal(
+      headerL10nID,
+      "migration-wizard-progress-done-with-warnings-header"
+    );
+  } else {
+    Assert.equal(headerL10nID, "migration-wizard-progress-done-header");
+  }
+
+  // Go through each displayed resource and make sure that only the
+  // ones that are expected are shown, and are showing the right
+  // success message.
+
+  let progressGroups = shadow.querySelectorAll(".resource-progress-group");
+  for (let progressGroup of progressGroups) {
+    if (expectedResourceTypes.includes(progressGroup.dataset.resourceType)) {
+      let progressIcon = progressGroup.querySelector(".progress-icon");
+      let messageText =
+        progressGroup.querySelector(".message-text").textContent;
+
+      if (warningResourceTypes.includes(progressGroup.dataset.resourceType)) {
+        Assert.equal(
+          progressIcon.getAttribute("state"),
+          "warning",
+          "Should be showing the warning icon state."
+        );
+      } else {
+        Assert.equal(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Should be showing the success icon state."
+        );
+      }
+
+      if (
+        RESOURCE_TYPES_WITH_QUANTITIES.includes(
+          progressGroup.dataset.resourceType
+        )
+      ) {
+        if (
+          progressGroup.dataset.resourceType ==
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY
+        ) {
+          // HISTORY is a special case that doesn't show the number of imported
+          // history entries, but instead shows the maximum number of days of history
+          // that might have been imported.
+          Assert.notEqual(
+            messageText.indexOf(MigrationUtils.HISTORY_MAX_AGE_IN_DAYS),
+            -1,
+            `Found expected maximum number of days of history: ${messageText}`
+          );
+        } else if (
+          progressGroup.dataset.resourceType ==
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA
+        ) {
+          // FORMDATA is another special case, because we simply show "Form history" as
+          // the message string, rather than a particular quantity.
+          Assert.equal(
+            messageText,
+            "Form history",
+            `Found expected form data string: ${messageText}`
+          );
+        } else if (
+          progressGroup.dataset.resourceType ==
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS
+        ) {
+          // waitForTestMigration by default sets up a "successful" migration of 1
+          // extension.
+          Assert.stringMatches(messageText, "1 extension");
+        } else {
+          Assert.notEqual(
+            messageText.indexOf(EXPECTED_QUANTITY),
+            -1,
+            `Found expected quantity in message string: ${messageText}`
+          );
+        }
+      } else {
+        // If you've found yourself here, and this is failing, it's probably because you've
+        // updated MigrationWizardParent.#getStringForImportQuantity to return a string for
+        // a resource type that's not in RESOURCE_TYPES_WITH_QUANTITIES, and you'll need
+        // to modify this function to check for that string.
+        Assert.equal(
+          messageText,
+          "",
+          "Expected the empty string if the resource type " +
+            "isn't in RESOURCE_TYPES_WITH_QUANTITIES"
+        );
+      }
+    } else {
+      Assert.ok(
+        BrowserTestUtils.isHidden(progressGroup),
+        `Resource progress group for ${progressGroup.dataset.resourceType}` +
+          ` should be hidden.`
+      );
+    }
+  }
+}
+
+/**
+ * Translates an entrypoint string into the proper numeric value for the
+ * FX_MIGRATION_ENTRY_POINT_CATEGORICAL histogram.
+ *
+ * @param {string} entrypoint
+ *   The entrypoint to translate from MIGRATION_ENTRYPOINTS.
+ * @returns {number}
+ *   The numeric index value for the FX_MIGRATION_ENTRY_POINT_CATEGORICAL
+ *   histogram.
+ */
+function getEntrypointHistogramIndex(entrypoint) {
+  switch (entrypoint) {
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.FIRSTRUN: {
+      return 1;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.FXREFRESH: {
+      return 2;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.PLACES: {
+      return 3;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.PASSWORDS: {
+      return 4;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.NEWTAB: {
+      return 5;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.FILE_MENU: {
+      return 6;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.HELP_MENU: {
+      return 7;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.BOOKMARKS_TOOLBAR: {
+      return 8;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.PREFERENCES: {
+      return 9;
+    }
+    case MigrationUtils.MIGRATION_ENTRYPOINTS.UNKNOWN:
+    // Intentional fall-through
+    default: {
+      return 0; // Unknown
+    }
+  }
+}
diff --git a/browser/components/migration/tests/chrome/chrome.toml b/browser/components/migration/tests/chrome/chrome.toml
new file mode 100644
index 0000000000..8f1c943f31
--- /dev/null
+++ b/browser/components/migration/tests/chrome/chrome.toml
@@ -0,0 +1,5 @@
+[DEFAULT]
+skip-if = ["os == 'android'"]
+support-files = ["../head-common.js"]
+
+["test_migration_wizard.html"]
diff --git a/browser/components/migration/tests/chrome/test_migration_wizard.html b/browser/components/migration/tests/chrome/test_migration_wizard.html
new file mode 100644
index 0000000000..d991cce114
--- /dev/null
+++ b/browser/components/migration/tests/chrome/test_migration_wizard.html
@@ -0,0 +1,1533 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Basic tests for the Migration Wizard component</title>
+    <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+    <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+    <script src="head-common.js"></script>
+    <script
+      src="chrome://browser/content/migration/migration-wizard.mjs"
+      type="module"
+    ></script>
+    <link
+      rel="stylesheet"
+      href="chrome://mochikit/content/tests/SimpleTest/test.css"
+    />
+    <script>
+      /* import-globals-from ../head-common.js */
+
+      "use strict";
+
+      const { BrowserTestUtils } = ChromeUtils.importESModule(
+        "resource://testing-common/BrowserTestUtils.sys.mjs"
+      );
+
+      const MIGRATOR_PROFILE_INSTANCES = [
+        {
+          key: "some-browser-0",
+          type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+          displayName: "Some Browser 0",
+          resourceTypes: ["HISTORY", "FORMDATA", "PASSWORDS", "BOOKMARKS", "EXTENSIONS"],
+          profile: { id: "person-2", name: "Person 2" },
+          hasPermissions: true,
+        },
+        {
+          key: "some-browser-1",
+          type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+          displayName: "Some Browser 1",
+          resourceTypes: ["HISTORY", "BOOKMARKS"],
+          profile: null,
+          hasPermissions: true,
+        },
+      ];
+
+      let gWiz = null;
+      let gShadowRoot = null;
+      let gDeck = null;
+
+      /**
+       * Returns the .resource-progress-group div for a particular resource
+       * type.
+       *
+       * @param {string} displayedResourceType
+       *   One of the constants belonging to
+       *   MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.
+       * @returns {Element}
+       */
+      function getResourceGroup(displayedResourceType) {
+        return gShadowRoot.querySelector(
+          `.resource-progress-group[data-resource-type="${displayedResourceType}"]`
+        );
+      }
+
+      add_setup(async function() {
+        gWiz = document.getElementById("test-wizard");
+        gShadowRoot = gWiz.openOrClosedShadowRoot;
+        gDeck = gShadowRoot.querySelector("#wizard-deck");
+      });
+
+      /**
+       * Tests that the MigrationWizard:RequestState event is fired when the
+       * <migration-wizard> is added to the DOM if the auto-request-state attribute
+       * is set, and then ensures that the starting page is correct.
+       *
+       * This also tests that the MigrationWizard:RequestState is not fired automatically
+       * if the auto-request-state attribute is not set, but is then fired upon calling
+       * requestState().
+       *
+       * This uses a dynamically created <migration-wizard> instead of the one already
+       * in the content div to make sure that the init event is captured.
+       */
+      add_task(async function test_init_event() {
+        const REQUEST_STATE_EVENT = "MigrationWizard:RequestState";
+
+        let wiz = document.createElement("migration-wizard");
+        wiz.toggleAttribute("auto-request-state", true);
+        let content = document.getElementById("content");
+        let promise = new Promise(resolve => {
+          content.addEventListener(REQUEST_STATE_EVENT, resolve, {
+            once: true,
+          });
+        });
+        content.appendChild(wiz);
+        await promise;
+        ok(true, `Saw ${REQUEST_STATE_EVENT} event.`);
+        let shadowRoot = wiz.openOrClosedShadowRoot;
+        let deck = shadowRoot.querySelector("#wizard-deck");
+        is(
+          deck.selectedViewName,
+          "page-loading",
+          "Should have the loading page selected"
+        );
+        wiz.remove();
+
+        wiz.toggleAttribute("auto-request-state", false);
+        let sawEvent = false;
+        let handler = () => {
+          sawEvent = true;
+        };
+        content.addEventListener(REQUEST_STATE_EVENT, handler);
+        content.appendChild(wiz);
+        ok(!sawEvent, `Should not have seen ${REQUEST_STATE_EVENT} event.`);
+        content.removeEventListener(REQUEST_STATE_EVENT, handler);
+
+        promise = new Promise(resolve => {
+          content.addEventListener(REQUEST_STATE_EVENT, resolve, {
+            once: true,
+          });
+        });
+        wiz.requestState();
+        await promise;
+        ok(true, `Saw ${REQUEST_STATE_EVENT} event.`);
+        wiz.remove();
+      });
+
+      /**
+       * Tests that the wizard can show a list of browser and profiles.
+       */
+      add_task(async function test_selection() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: false,
+        });
+
+        let selector = gShadowRoot.querySelector("#browser-profile-selector");
+        let preamble = gShadowRoot.querySelector(".resource-selection-preamble");
+        ok(!isHidden(preamble), "preamble should shown.");
+
+        let panelList = gShadowRoot.querySelector("panel-list");
+        is(panelList.childElementCount, 2, "Should have two child elements");
+
+        let resourceTypeList = gShadowRoot.querySelector("#resource-type-list");
+        let details = gShadowRoot.querySelector("details");
+        ok(details.open, "Details should be open");
+
+        // Test that the resource type checkboxes are shown or hidden depending on
+        // which resourceTypes are included with the MigratorProfileInstance.
+        for (let migratorInstance of MIGRATOR_PROFILE_INSTANCES) {
+          selector.click();
+          await new Promise(resolve => {
+            gShadowRoot
+              .querySelector("panel-list")
+              .addEventListener("shown", resolve, { once: true });
+          });
+          let panelItem = gShadowRoot.querySelector(
+            `panel-item[key="${migratorInstance.key}"]`
+          );
+          ok(panelItem, "Should find panel-item.");
+          panelItem.click();
+
+          is(
+            selector.querySelector("#migrator-name").textContent,
+            migratorInstance.displayName,
+            "Selector should show display name"
+          );
+          let profileName = selector.querySelector("#profile-name");
+
+          if (migratorInstance.profile) {
+            ok(!isHidden(profileName), "Profile name element should be displayed.");
+            is(
+              profileName.textContent,
+              migratorInstance.profile.name,
+              "Selector should show profile name"
+            );
+          } else {
+            ok(isHidden(profileName), "Profile name element should be hidden.");
+            is(profileName.textContent, "");
+          }
+
+          for (let resourceType of getChoosableResourceTypes()) {
+            let node = resourceTypeList.querySelector(
+              `label[data-resource-type="${resourceType}"]`
+            );
+
+            if (migratorInstance.resourceTypes.includes(resourceType)) {
+              ok(!isHidden(node), `Selection for ${resourceType} should be shown.`);
+              ok(
+                node.control.checked,
+                `Checkbox for ${resourceType} should be checked.`
+              );
+            } else {
+              ok(isHidden(node), `Selection for ${resourceType} should be hidden.`);
+              ok(
+                !node.control.checked,
+                `Checkbox for ${resourceType} should be unchecked.`
+              );
+            }
+          }
+        }
+
+        let selectAll = gShadowRoot.querySelector("#select-all");
+        let summary = gShadowRoot.querySelector("summary");
+        ok(isHidden(selectAll), "Selection for select-all should be hidden.");
+        ok(isHidden(summary), "Summary should be hidden.");
+        ok(!isHidden(details), "Details should be shown.");
+      });
+
+      /**
+       * Tests the migration wizard with no resources
+       */
+      add_task(async function test_no_resources() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: [{
+            key: "some-browser-0",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 0 with no resources",
+            resourceTypes: [],
+            profile: { id: "person-1", name: "Person 1" },
+            hasPermissions: true,
+          }],
+          showImportAll: false,
+        });
+
+        let noResourcesFound = gShadowRoot.querySelector(".no-resources-found");
+        let hideOnErrorEls = gShadowRoot.querySelectorAll(".hide-on-error");
+        ok(
+          !isHidden(noResourcesFound),
+          "Error message of no reasources should be shown."
+        );
+        for (let hideOnErrorEl of hideOnErrorEls) {
+          ok(isHidden(hideOnErrorEl), "Item should be hidden.");
+        }
+      });
+
+      /**
+       * Tests variant 2 of the migration wizard
+       */
+      add_task(async function test_selection_variant_2() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: true,
+        });
+
+        let preamble = gShadowRoot.querySelector(".resource-selection-preamble");
+        ok(isHidden(preamble), "preamble should be hidden.");
+
+        let selector = gShadowRoot.querySelector("#browser-profile-selector");
+        selector.click();
+        await new Promise(resolve => {
+          let panelList = gShadowRoot.querySelector("panel-list");
+          if (panelList) {
+            panelList.addEventListener("shown", resolve, { once: true });
+          }
+        });
+
+        let panelItems = gShadowRoot.querySelectorAll("panel-list > panel-item");
+        is(panelItems.length, 2, "Should have two panel items");
+
+        let details = gShadowRoot.querySelector("details");
+        ok(!details.open, "Details should be closed");
+        details.open = true;
+
+        for (let i = 0; i < panelItems.length; i++) {
+          let migratorInstance = MIGRATOR_PROFILE_INSTANCES[i];
+          let panelItem = panelItems[i];
+          panelItem.click();
+          for (let resourceType of getChoosableResourceTypes()) {
+            let node = gShadowRoot.querySelector(
+              `#resource-type-list label[data-resource-type="${resourceType}"]`
+            );
+            if (migratorInstance.resourceTypes.includes(resourceType)) {
+              ok(!isHidden(node), `Selection for ${resourceType} should be shown.`);
+              ok(
+                node.control.checked,
+                `Checkbox for ${resourceType} should be checked.`
+              );
+            } else {
+              ok(isHidden(node), `Selection for ${resourceType} should be hidden.`);
+              ok(
+                !node.control.checked,
+                `Checkbox for ${resourceType} should be unchecked.`
+              );
+            }
+          }
+        }
+
+        let selectAll = gShadowRoot.querySelector("#select-all");
+        let summary = gShadowRoot.querySelector("summary");
+        ok(!isHidden(selectAll), "Selection for select-all should be shown.");
+        ok(selectAll.control.checked, "Checkbox for select-all should be checked.");
+        ok(!isHidden(summary), "Summary should be shown.");
+        ok(!isHidden(details), "Details should be shown.");
+
+        let selectAllCheckbox = gShadowRoot.querySelector(".select-all-checkbox");
+        selectAllCheckbox.checked = true;
+        selectAllCheckbox.dispatchEvent(new CustomEvent("change"));
+        let resourceLabels = gShadowRoot.querySelectorAll("label[data-resource-type]");
+        for (let resourceLabel of resourceLabels) {
+          if (resourceLabel.hidden) {
+            ok(
+              !resourceLabel.control.checked,
+              `Hidden checkbox for ${resourceLabel.dataset.resourceType} should be unchecked.`
+
+            );
+          } else {
+            ok(
+              resourceLabel.control.checked,
+              `Visible checkbox for ${resourceLabel.dataset.resourceType} should be checked.`
+            );
+          }
+        }
+
+        let selectedDataHeader = gShadowRoot.querySelector(".selected-data-header");
+        let selectedData = gShadowRoot.querySelector(".selected-data");
+
+        let bookmarks = gShadowRoot.querySelector("#bookmarks");
+        let history = gShadowRoot.querySelector("#history");
+
+        let selectedDataUpdated = BrowserTestUtils.waitForEvent(
+          gWiz,
+          "MigrationWizard:ResourcesUpdated"
+        );
+        bookmarks.control.checked = true;
+        history.control.checked = true;
+        bookmarks.dispatchEvent(new CustomEvent("change"));
+
+        ok(bookmarks.control.checked, "Bookmarks should be checked");
+        ok(history.control.checked, "History should be checked");
+
+        await selectedDataUpdated;
+
+        is(
+          selectedData.textContent,
+          "Bookmarks and history",
+          "Testing if selected-data reflects the selected resources."
+        );
+
+        is(
+          selectedDataHeader.dataset.l10nId,
+          "migration-all-available-data-label",
+          "Testing if selected-data-header reflects the selected resources"
+        );
+
+        let importButton = gShadowRoot.querySelector("#import");
+
+        ok(
+          !importButton.disabled,
+          "Testing if import button is enabled when at least one resource is selected."
+        );
+
+        let importButtonUpdated = BrowserTestUtils.waitForEvent(
+          gWiz,
+          "MigrationWizard:ResourcesUpdated"
+        );
+
+        selectAllCheckbox.checked = false;
+        selectAllCheckbox.dispatchEvent(new CustomEvent("change", { bubbles: true }));
+        await importButtonUpdated;
+
+        ok(
+          importButton.disabled,
+          "Testing if import button is disabled when no resources are selected."
+        );
+      });
+
+      /**
+       * Tests variant 2 of the migration wizard when there's a single resource
+       * item.
+       */
+      add_task(async function test_selection_variant_2_single_item() {
+        let resourcesUpdated = BrowserTestUtils.waitForEvent(
+          gWiz,
+          "MigrationWizard:ResourcesUpdated"
+        );
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: [{
+            key: "some-browser-0",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 0 with a single resource",
+            resourceTypes: ["HISTORY"],
+            profile: { id: "person-1", name: "Person 1" },
+            hasPermissions: true,
+          }, {
+            key: "some-browser-1",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 1 with a two resources",
+            resourceTypes: ["HISTORY", "BOOKMARKS"],
+            profile: { id: "person-2", name: "Person 2" },
+            hasPermissions: true,
+          }],
+          showImportAll: true,
+        });
+        await resourcesUpdated;
+
+        let selectAll = gShadowRoot.querySelector("#select-all");
+        let summary = gShadowRoot.querySelector("summary");
+        let details = gShadowRoot.querySelector("details");
+        ok(!details.open, "Details should be closed");
+        details.open = true;
+
+        ok(isHidden(selectAll), "Selection for select-all should be hidden.");
+        ok(!isHidden(summary), "Summary should be shown.");
+        ok(!isHidden(details), "Details should be shown.");
+
+        resourcesUpdated = BrowserTestUtils.waitForEvent(
+          gWiz,
+          "MigrationWizard:ResourcesUpdated"
+        );
+        let browser1Item = gShadowRoot.querySelector("panel-item[key='some-browser-1']");
+        browser1Item.click();
+        await resourcesUpdated;
+
+        ok(!isHidden(selectAll), "Selection for select-all should be shown.");
+        ok(!isHidden(summary), "Summary should be shown.");
+        ok(!isHidden(details), "Details should be shown.");
+      });
+
+      /**
+       * Tests that the Select All checkbox is checked if all non-hidden resource
+       * types are checked, and unchecked otherwise.
+       */
+      add_task(async function test_selection_variant_2_select_all() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: true,
+        });
+
+        let details = gShadowRoot.querySelector("details");
+        ok(!details.open, "Details should be closed");
+        details.open = true;
+
+        let selectAll = gShadowRoot.querySelector("#select-all");
+        ok(selectAll.control.checked, "Select all should be checked by default");
+
+        let bookmarksResourceLabel = gShadowRoot.querySelector(
+          "label[data-resource-type='BOOKMARKS']"
+        );
+        ok(bookmarksResourceLabel.control.checked, "Bookmarks should be checked");
+
+        bookmarksResourceLabel.control.click();
+        ok(!bookmarksResourceLabel.control.checked, "Bookmarks should no longer be checked");
+        ok(!selectAll.control.checked, "Select all should not longer be checked");
+
+        bookmarksResourceLabel.control.click();
+        ok(bookmarksResourceLabel.control.checked, "Bookmarks should be checked again");
+        ok(selectAll.control.checked, "Select all should be checked");
+      });
+
+      /**
+       * Tests that the wizard can show partial progress during migration.
+       */
+      add_task(async function test_partial_progress() {
+        const BOOKMARKS_SUCCESS_STRING = "Some bookmarks success string";
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: BOOKMARKS_SUCCESS_STRING,
+            },
+            // Don't include PASSWORDS to check that it's hidden.
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+            },
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+            },
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+            },
+          },
+        });
+        is(
+          gDeck.selectedViewName,
+          "page-progress",
+          "Should have the progress page selected"
+        );
+
+        // Bookmarks
+        let bookmarksGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS
+        );
+        ok(!isHidden(bookmarksGroup), "Bookmarks group should be visible");
+        let progressIcon = bookmarksGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          bookmarksGroup.querySelector(".message-text").textContent,
+          BOOKMARKS_SUCCESS_STRING
+        );
+
+        // Passwords
+        let passwordsGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS
+        );
+        ok(isHidden(passwordsGroup), "Passwords group should be hidden");
+
+        // History
+        let historyGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY
+        );
+        ok(!isHidden(historyGroup), "History group should be visible");
+        progressIcon = historyGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(historyGroup.querySelector(".message-text").textContent.trim(), "");
+
+        // Extensions
+        let extensionsGroup = getResourceGroup(MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS);
+        ok(!isHidden(extensionsGroup), "Extensions group should be visible");
+        progressIcon = extensionsGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(extensionsGroup.querySelector("a.message-text").textContent.trim(), "");
+        is(extensionsGroup.querySelector("span.message-text").textContent.trim(), "");
+
+        // Form Data
+        let formDataGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA
+        );
+        ok(!isHidden(formDataGroup), "Form data group should be visible");
+        progressIcon = formDataGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(formDataGroup.querySelector(".message-text").textContent.trim(), "");
+
+        // With progress still being underway, the header should be using the
+        // in progress string.
+        let header = gShadowRoot.querySelector("#progress-header");
+        is(
+          header.getAttribute("data-l10n-id"),
+          "migration-wizard-progress-header",
+          "Should be showing in-progress header string"
+        );
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(isHidden(doneButton), "Done button should be hidden");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(!isHidden(cancelButton), "Cancel button should be visible");
+        ok(cancelButton.disabled, "Cancel button should be disabled");
+      });
+
+      /**
+       * Tests that the wizard can show completed migration progress.
+       */
+      add_task(async function test_completed_progress() {
+        const BOOKMARKS_SUCCESS_STRING = "Some bookmarks success string";
+        const PASSWORDS_SUCCESS_STRING = "Some passwords success string";
+        const FORMDATA_SUCCESS_STRING = "Some formdata string";
+        const EXTENSIONS_SUCCESS_STRING = "Some extensions string";
+        const EXTENSIONS_SUCCESS_HREF = "about:addons";
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: BOOKMARKS_SUCCESS_STRING,
+            },
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: PASSWORDS_SUCCESS_STRING,
+            },
+            // Don't include HISTORY to check that it's hidden.
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: EXTENSIONS_SUCCESS_STRING,
+            },
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: FORMDATA_SUCCESS_STRING,
+            },
+          },
+        });
+        is(
+          gDeck.selectedViewName,
+          "page-progress",
+          "Should have the progress page selected"
+        );
+
+        // Bookmarks
+        let bookmarksGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS
+        );
+        ok(!isHidden(bookmarksGroup), "Bookmarks group should be visible");
+        let progressIcon = bookmarksGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          bookmarksGroup.querySelector(".message-text").textContent,
+          BOOKMARKS_SUCCESS_STRING
+        );
+
+        // Passwords
+        let passwordsGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.PASSWORDS
+        );
+        ok(!isHidden(passwordsGroup), "Passwords group should be visible");
+        progressIcon = passwordsGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          passwordsGroup.querySelector(".message-text").textContent,
+          PASSWORDS_SUCCESS_STRING
+        );
+
+        // History
+        let historyGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.HISTORY
+        );
+        ok(isHidden(historyGroup), "History group should be hidden");
+
+        // Extensions
+        let extensionsDataGroup = getResourceGroup(MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS);
+        ok(!isHidden(extensionsDataGroup), "Extensions data group should be visible");
+        progressIcon = extensionsDataGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          extensionsDataGroup.querySelector("a.message-text").textContent,
+          EXTENSIONS_SUCCESS_STRING
+        );
+        is(
+          extensionsDataGroup.querySelector("a.message-text").href,
+          EXTENSIONS_SUCCESS_HREF
+        )
+        // Form Data
+        let formDataGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.FORMDATA
+        );
+        ok(!isHidden(formDataGroup), "Form data group should be visible");
+        progressIcon = formDataGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          formDataGroup.querySelector(".message-text").textContent,
+          FORMDATA_SUCCESS_STRING
+        );
+
+        // With progress being complete, the header should be using the completed
+        // migration string.
+        let header = gShadowRoot.querySelector("#progress-header");
+        is(
+          header.getAttribute("data-l10n-id"),
+          "migration-wizard-progress-done-header",
+          "Should be showing completed migration header string"
+        );
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(!isHidden(doneButton), "Done button should be visible and enabled");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+      });
+
+      add_task(async function test_extension_partial_success() {
+        const EXTENSIONS_INFO_STRING = "Extensions info string";
+        const EXTENSIONS_INFO_HREF = "about:addons";
+        const EXTENSIONS_SUPPORT_STRING = "extensions support string";
+        const EXTENSIONS_SUPPORT_HREF = "about:blank";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.INFO,
+              message: EXTENSIONS_INFO_STRING,
+              linkText: EXTENSIONS_SUPPORT_STRING,
+              linkURL: EXTENSIONS_SUPPORT_HREF,
+            }
+          }
+        });
+        is(
+          gDeck.selectedViewName,
+          "page-progress",
+          "Should have the progress page selected"
+        );
+
+        let extensionsGroup = getResourceGroup(MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS);
+        ok(!isHidden(extensionsGroup), "Extensions group should be visible");
+        let progressIcon = extensionsGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "info",
+          "Progress should be completed, in info state"
+        );
+        is(
+          extensionsGroup.querySelector("a.message-text").textContent,
+          EXTENSIONS_INFO_STRING
+        );
+        is(
+          extensionsGroup.querySelector("a.message-text").href,
+          EXTENSIONS_INFO_HREF
+        );
+        is(
+          extensionsGroup.querySelector(".support-text").textContent,
+          EXTENSIONS_SUPPORT_STRING
+        );
+        is(
+          extensionsGroup.querySelector(".support-text").href,
+          EXTENSIONS_SUPPORT_HREF
+        );
+
+        // With progress being complete, the header should be using the completed
+        // migration string.
+        let header = gShadowRoot.querySelector("#progress-header");
+        is(
+          header.getAttribute("data-l10n-id"),
+          "migration-wizard-progress-done-header",
+          "Should be showing completed migration header string"
+        );
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(!isHidden(doneButton), "Done button should be visible and enabled");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+      });
+
+      add_task(async function test_extension_error() {
+        const EXTENSIONS_ERROR_STRING = "Extensions error string";
+        const EXTENSIONS_SUPPORT_STRING = "extensions support string";
+        const EXTENSIONS_SUPPORT_HREF = "about:blank";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.WARNING,
+              message: EXTENSIONS_ERROR_STRING,
+              linkText: EXTENSIONS_SUPPORT_STRING,
+              linkURL: EXTENSIONS_SUPPORT_HREF,
+            }
+          }
+        });
+        is(
+          gDeck.selectedViewName,
+          "page-progress",
+          "Should have the progress page selected"
+        );
+
+        let extensionsGroup = getResourceGroup(MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.EXTENSIONS);
+        ok(!isHidden(extensionsGroup), "Extensions group should be visible");
+        let progressIcon = extensionsGroup.querySelector(".progress-icon");
+        is(progressIcon.getAttribute("state"), "warning");
+        is(
+          extensionsGroup.querySelector("a.message-text").textContent,
+          ""
+        );
+        is(
+          extensionsGroup.querySelector("span.message-text").textContent,
+          EXTENSIONS_ERROR_STRING
+        );
+        is(
+          extensionsGroup.querySelector(".support-text").textContent,
+          EXTENSIONS_SUPPORT_STRING
+        );
+        is(
+          extensionsGroup.querySelector(".support-text").href,
+          EXTENSIONS_SUPPORT_HREF
+        );
+
+        // With progress being complete, the header should be using the completed
+        // migration string.
+        let header = gShadowRoot.querySelector("#progress-header");
+        is(
+          header.getAttribute("data-l10n-id"),
+          "migration-wizard-progress-done-with-warnings-header",
+          "Should be showing completed migration header string"
+        );
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(!isHidden(doneButton), "Done button should be visible and enabled");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+      });
+
+      /**
+       * Tests that the wizard can show partial progress during file migration.
+       */
+      add_task(async function test_partial_file_progress() {
+        const PASSWORDS_SUCCESS_STRING = "Some passwords success string";
+        const TITLE = "Partial progress";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS,
+          title: "Partial progress",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_FROM_FILE]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: PASSWORDS_SUCCESS_STRING,
+            },
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+            },
+          },
+        });
+
+        is(
+          gDeck.selectedViewName,
+          "page-file-import-progress",
+          "Should have the file progress page selected"
+        );
+
+        let header = gShadowRoot.querySelector("#file-import-progress-header");
+        is(header.textContent, TITLE, "Title is set correctly.");
+
+        let passwordsFromFileGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_FROM_FILE
+        );
+        ok(!isHidden(passwordsFromFileGroup), "Passwords from file group should be visible");
+        let progressIcon = passwordsFromFileGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          passwordsFromFileGroup.querySelector(".message-text").textContent,
+          PASSWORDS_SUCCESS_STRING
+        );
+
+        let passwordsUpdatedGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED
+        );
+        ok(isHidden(passwordsUpdatedGroup), "Passwords updated group should be hidden");
+
+        let passwordsNewGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW
+        );
+        ok(!isHidden(passwordsNewGroup), "Passwords new group should be visible");
+        progressIcon = passwordsNewGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(passwordsNewGroup.querySelector(".message-text").textContent.trim(), "");
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-file-import-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(isHidden(doneButton), "Done button should be hidden");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(!isHidden(cancelButton), "Cancel button should be visible");
+        ok(cancelButton.disabled, "Cancel button should be disabled");
+      });
+
+      /**
+       * Tests that the wizard can show completed migration progress.
+       */
+      add_task(async function test_completed_file_progress() {
+        const PASSWORDS_NEW_SUCCESS_STRING = "2 added";
+        const PASSWORDS_UPDATED_SUCCESS_STRING = "5 updated";
+        const TITLE = "Done doing file import";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS,
+          title: TITLE,
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: PASSWORDS_NEW_SUCCESS_STRING,
+            },
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: PASSWORDS_UPDATED_SUCCESS_STRING,
+            },
+          },
+        });
+        is(
+          gDeck.selectedViewName,
+          "page-file-import-progress",
+          "Should have the file progress page selected"
+        );
+
+        let header = gShadowRoot.querySelector("#file-import-progress-header");
+        is(header.textContent, TITLE, "Title is set correctly.");
+
+        let passwordsNewGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW
+        );
+        ok(!isHidden(passwordsNewGroup), "Passwords new group should be visible");
+        let progressIcon = passwordsNewGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          passwordsNewGroup.querySelector(".message-text").textContent,
+          PASSWORDS_NEW_SUCCESS_STRING
+        );
+
+        let passwordsUpdatedGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED
+        );
+        ok(!isHidden(passwordsUpdatedGroup), "Passwords updated group should be visible");
+        progressIcon = passwordsUpdatedGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          passwordsUpdatedGroup.querySelector(".message-text").textContent,
+          PASSWORDS_UPDATED_SUCCESS_STRING
+        );
+
+        let passwordsFromFileGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_FROM_FILE
+        );
+        ok(isHidden(passwordsFromFileGroup), "Passwords from file group should be hidden");
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-file-import-progress']");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(!isHidden(doneButton), "Done button should be visible and enabled");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+      });
+
+      /**
+       * Tests that the buttons that dismiss the wizard when embedded in
+       * a dialog are only visible when in dialog mode, and dispatch a
+       * MigrationWizard:Close event when clicked.
+       */
+      add_task(async function test_dialog_mode_close() {
+        gWiz.toggleAttribute("dialog-mode", true);
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+        });
+
+        // For now, there's only a single .cancel-close button, so let's just test
+        // that one. Let's make this test fail if there are multiple so that we can
+        // then update this test to switch to the right pages to test those buttons
+        // too.
+        let buttons = gShadowRoot.querySelectorAll(".cancel-close:not([disabled])");
+        ok(
+          buttons.length,
+          "This test expects at least one enabled .cancel-close button"
+        );
+        let button = buttons[0];
+        ok(
+          !isHidden(button),
+          ".cancel-close button should be visible in dialog mode."
+        );
+        let closeEvent = BrowserTestUtils.waitForEvent(gWiz, "MigrationWizard:Close");
+        button.click();
+        await closeEvent;
+
+        gWiz.toggleAttribute("dialog-mode", false);
+        ok(
+          isHidden(button),
+          ".cancel-close button should be hidden when not in dialog mode."
+        );
+      });
+
+      /**
+       * Internet Explorer and Edge refer to bookmarks as "favorites",
+       * and we change our labels to suit when either of those browsers are
+       * selected as the migration source. This test tests that behavior in the
+       * selection page.
+       */
+      add_task(async function test_ie_edge_favorites_selection() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: false,
+        });
+
+        let bookmarksCheckboxLabel = gShadowRoot.querySelector("#bookmarks");
+        let span = bookmarksCheckboxLabel.querySelector("span[default-data-l10n-id]");
+        ok(span, "The bookmarks selection span has a default-data-l10n-id attribute");
+        is(
+          span.getAttribute("data-l10n-id"),
+          span.getAttribute("default-data-l10n-id"),
+          "Should be showing the default string for bookmarks"
+        );
+
+        // Now test when in Variant 2, for the string in the <summary>.
+        let selectedDataUpdated = BrowserTestUtils.waitForEvent(
+          gWiz,
+          "MigrationWizard:ResourcesUpdated"
+        );
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: true,
+        });
+
+        await selectedDataUpdated;
+
+        let summary = gShadowRoot.querySelector("summary");
+        ok(
+          summary.textContent.toLowerCase().includes("bookmarks"),
+          "Summary should include the string 'bookmarks'"
+        );
+
+        for (let key of MigrationWizardConstants.USES_FAVORITES) {
+          gWiz.setState({
+            page: MigrationWizardConstants.PAGES.SELECTION,
+            migrators: [{
+              key,
+              displayName: "Legacy Microsoft Browser",
+              resourceTypes: ["BOOKMARKS"],
+              profile: null,
+              hasPermissions: true,
+            }],
+            showImportAll: false,
+          });
+
+          is(
+            span.getAttribute("data-l10n-id"),
+            span.getAttribute("ie-edge-data-l10n-id"),
+            "Should be showing the IE/Edge string for bookmarks"
+          );
+
+          // Now test when in Variant 2, for the string in the <summary>.
+          selectedDataUpdated = BrowserTestUtils.waitForEvent(
+            gWiz,
+            "MigrationWizard:ResourcesUpdated"
+          );
+
+          gWiz.setState({
+            page: MigrationWizardConstants.PAGES.SELECTION,
+            migrators: [{
+              key,
+              displayName: "Legacy Microsoft Browser",
+              resourceTypes: ["BOOKMARKS"],
+              profile: null,
+              hasPermissions: true,
+            }],
+            showImportAll: true,
+          });
+
+          await selectedDataUpdated;
+
+          ok(
+            summary.textContent.toLowerCase().includes("favorites"),
+            "Summary should include the string 'favorites'"
+          );
+        }
+      });
+
+      /**
+       * Internet Explorer and Edge refer to bookmarks as "favorites",
+       * and we change our labels to suit when either of those browsers are
+       * selected as the migration source. This test tests that behavior in the
+       * progress page
+       */
+      add_task(async function test_ie_edge_favorites_progress() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              inProgress: false,
+              message: "A string from the parent",
+            },
+          },
+        });
+
+        let bookmarksGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS
+        );
+        let span = bookmarksGroup.querySelector("span[default-data-l10n-id]");
+        ok(span, "Should have found a span with default-data-l10n-id");
+        is(
+          span.getAttribute("data-l10n-id"),
+          span.getAttribute("default-data-l10n-id"),
+          "Should be using the default string."
+        );
+
+
+        for (let key of MigrationWizardConstants.USES_FAVORITES) {
+          gWiz.setState({
+            page: MigrationWizardConstants.PAGES.PROGRESS,
+            key,
+            progress: {
+              [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+                inProgress: false,
+                message: "A string from the parent",
+              },
+            },
+          });
+
+          is(
+            span.getAttribute("data-l10n-id"),
+            span.getAttribute("ie-edge-data-l10n-id"),
+            "Should be showing the IE/Edge string for bookmarks"
+          );
+        }
+      });
+
+      /**
+       * Tests that the button shown in either the browser migration success or
+       * file migration success pages is a "continue" button rather than a
+       * "done" button.
+       */
+      add_task(async function test_embedded_continue_button() {
+        gWiz.toggleAttribute("dialog-mode", false);
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: "A string from the parent",
+            },
+          },
+        });
+
+        let progressPage = gShadowRoot.querySelector("div[name='page-progress']");
+        let cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+        let doneButton = progressPage.querySelector(".done-button");
+        ok(isHidden(doneButton), "Done button should be hidden when embedding");
+        let continueButton = progressPage.querySelector(".continue-button");
+        ok(!isHidden(continueButton), "Continue button should be displayed");
+
+        let content = document.getElementById("content");
+
+        let promise = new Promise(resolve => {
+          content.addEventListener("MigrationWizard:Close", resolve, {
+            once: true,
+          });
+        });
+        continueButton.click();
+        await promise;
+        ok(
+          true,
+          "Clicking on the Continue button sent the MigrationWizard:Close event."
+        );
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS,
+          title: "Done importing file data",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]: {
+              inProgress: false,
+              message: "Some message",
+            },
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED]: {
+              inProgress: false,
+              message: "Some other",
+            },
+          },
+        });
+
+        progressPage = gShadowRoot.querySelector("div[name='page-file-import-progress']");
+        cancelButton = progressPage.querySelector(".cancel-close");
+        ok(isHidden(cancelButton), "Cancel button should be hidden");
+        doneButton = progressPage.querySelector(".done-button");
+        ok(isHidden(doneButton), "Done button should be hidden when embedding");
+        continueButton = progressPage.querySelector(".continue-button");
+        ok(!isHidden(continueButton), "Continue button should be displayed");
+
+        promise = new Promise(resolve => {
+          content.addEventListener("MigrationWizard:Close", resolve, {
+            once: true,
+          });
+        });
+        continueButton.click();
+        await promise;
+        ok(
+          true,
+          "Clicking on the Continue button sent the MigrationWizard:Close event."
+        );
+
+        gWiz.toggleAttribute("dialog-mode", true);
+      });
+
+      /**
+       * Tests that if a progress update comes down which puts a resource from
+       * being done to loading, that the status message is cleared.
+       */
+      add_task(async function test_clear_status_message_when_in_progress() {
+        const STRING_TO_CLEAR = "This string should get cleared";
+        gWiz.toggleAttribute("dialog-mode", false);
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: STRING_TO_CLEAR,
+            },
+          },
+        });
+
+        let bookmarksGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS
+        );
+        ok(!isHidden(bookmarksGroup), "Bookmarks group should be visible");
+        let progressIcon = bookmarksGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          bookmarksGroup.querySelector(".message-text").textContent,
+          STRING_TO_CLEAR
+        );
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES.BOOKMARKS]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+              message: "",
+            },
+          },
+        });
+
+        ok(!isHidden(bookmarksGroup), "Bookmarks group should be visible");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(
+          bookmarksGroup.querySelector(".message-text").textContent.trim(),
+          ""
+        );
+      });
+
+      /**
+       * Tests that if a file progress update comes down which puts a resource
+       * from being done to loading, that the status message is cleared.
+       *
+       * This is extremely similar to the above test, except that it's for progress
+       * updates for file resources.
+       */
+      add_task(async function test_clear_status_message_when_in_file_progress() {
+        const STRING_TO_CLEAR = "This string should get cleared";
+        gWiz.toggleAttribute("dialog-mode", false);
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.SUCCESS,
+              message: STRING_TO_CLEAR,
+            },
+          },
+        });
+
+        let passwordsGroup = getResourceGroup(
+          MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW
+        );
+        ok(!isHidden(passwordsGroup), "Passwords group should be visible");
+        let progressIcon = passwordsGroup.querySelector(".progress-icon");
+        is(
+          progressIcon.getAttribute("state"),
+          "success",
+          "Progress should be completed"
+        );
+        is(
+          passwordsGroup.querySelector(".message-text").textContent,
+          STRING_TO_CLEAR
+        );
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.FILE_IMPORT_PROGRESS,
+          key: "chrome",
+          progress: {
+            [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]: {
+              value: MigrationWizardConstants.PROGRESS_VALUE.LOADING,
+              message: "",
+            },
+          },
+        });
+
+        ok(!isHidden(passwordsGroup), "Passwords group should be visible");
+        is(
+          progressIcon.getAttribute("state"),
+          "loading",
+          "Progress should be still be underway"
+        );
+        is(
+          passwordsGroup.querySelector(".message-text").textContent.trim(),
+          ""
+        );
+      });
+
+      /**
+       * Tests that the migration wizard can be put into the selection page after
+       * a file migrator error and show an error message.
+       */
+      add_task(async function test_file_migrator_error() {
+        const FILE_MIGRATOR_KEY = "some-file-migrator";
+        const FILE_IMPORT_ERROR_MESSAGE = "This is an error message";
+        const MIGRATORS = [
+          {
+            key: "some-browser-0",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 0",
+            resourceTypes: ["HISTORY", "FORMDATA", "PASSWORDS", "BOOKMARKS"],
+            profile: { id: "person-2", name: "Person 2" },
+            hasPermissions: true,
+          },
+          {
+            key: "some-browser-1",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 1",
+            resourceTypes: ["HISTORY", "BOOKMARKS"],
+            profile: null,
+            hasPermissions: true,
+          },
+          {
+            key: FILE_MIGRATOR_KEY,
+            type: MigrationWizardConstants.MIGRATOR_TYPES.FILE,
+            displayName: "Some File Migrator",
+            resourceTypes: [],
+          },
+        ];
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATORS,
+          showImportAll: true,
+          migratorKey: "some-file-migrator",
+          fileImportErrorMessage: FILE_IMPORT_ERROR_MESSAGE,
+        });
+
+        let errorMessageContainer = gShadowRoot.querySelector(".file-import-error");
+        ok(!isHidden(errorMessageContainer), "Error message should be shown.");
+        let errorText = gShadowRoot.querySelector("#file-import-error-message").textContent;
+        is(errorText, FILE_IMPORT_ERROR_MESSAGE);
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATORS,
+          showImportAll: true,
+        });
+
+        ok(isHidden(errorMessageContainer), "Error message should be hidden.");
+        errorText = gShadowRoot.querySelector("#file-import-error-message").textContent;
+        is(errorText, "");
+      });
+
+      /**
+       * Tests that the variant of the wizard can be forced via
+       * attributes on the migration-wizard element.
+       */
+      add_task(async function force_show_import_all() {
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: true,
+        });
+
+        let selectionPage = gShadowRoot.querySelector("div[name='page-selection']");
+        let details = gShadowRoot.querySelector("details");
+        ok(
+          selectionPage.hasAttribute("show-import-all"),
+          "Should be paying attention to showImportAll=true on state object"
+        );
+        ok(!details.open, "Details collapsed by default");
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: false,
+        });
+
+        ok(
+          !selectionPage.hasAttribute("show-import-all"),
+          "Should be paying attention to showImportAll=false on state object"
+        );
+        ok(details.open, "Details expanded by default");
+
+        gWiz.setAttribute("force-show-import-all", "false");
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: true,
+        });
+        ok(
+          !selectionPage.hasAttribute("show-import-all"),
+          "Should be paying attention to force-show-import-all=false on DOM node"
+        );
+        ok(details.open, "Details expanded by default");
+
+        gWiz.setAttribute("force-show-import-all", "true");
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: false,
+        });
+        ok(
+          selectionPage.hasAttribute("show-import-all"),
+          "Should be paying attention to force-show-import-all=true on DOM node"
+        );
+        ok(!details.open, "Details collapsed by default");
+
+        gWiz.removeAttribute("force-show-import-all");
+      });
+
+      /**
+       * Tests that for non-Safari migrators without permissions, we show
+       * the appropriate message and the button for getting permissions.
+       */
+      add_task(async function no_permissions() {
+        const SOME_FAKE_PERMISSION_PATH = "/some/fake/path";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: [{
+            key: "some-browser-0",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Some Browser 0 with no permissions",
+            resourceTypes: [],
+            profile: null,
+            hasPermissions: false,
+            permissionsPath: SOME_FAKE_PERMISSION_PATH,
+          }],
+          showImportAll: false,
+        });
+
+        let selectionPage = gShadowRoot.querySelector("div[name='page-selection']");
+        ok(selectionPage.hasAttribute("no-permissions"), "no-permissions attribute set.");
+
+        let resourceList = gShadowRoot.querySelector(".resource-selection-details");
+        ok(isHidden(resourceList), "Resources list is hidden.");
+
+        let importButton = gShadowRoot.querySelector("#import");
+        ok(isHidden(importButton), "Import button hidden.");
+        let noPermissionsMessage = gShadowRoot.querySelector(".no-permissions-message");
+        ok(!isHidden(noPermissionsMessage), "No permissions message shown.");
+        let getPermissionButton = gShadowRoot.querySelector("#get-permissions");
+        ok(!isHidden(getPermissionButton), "Get permissions button shown.");
+
+        let step2 = gShadowRoot.querySelector(".migration-no-permissions-instructions-step2");
+        ok(step2.hasAttribute("data-l10n-args"));
+        is(JSON.parse(step2.getAttribute("data-l10n-args")).permissionsPath, SOME_FAKE_PERMISSION_PATH);
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: MIGRATOR_PROFILE_INSTANCES,
+          showImportAll: false,
+        });
+
+        ok(!selectionPage.hasAttribute("no-permissions"), "no-permissions attribute set to false.");
+        ok(!isHidden(resourceList), "Resources list is shown.");
+        ok(!isHidden(importButton), "Import button is shown.");
+        ok(isHidden(noPermissionsMessage), "No permissions message hidden.");
+        ok(isHidden(getPermissionButton), "Get permissions button hidden.");
+      });
+
+      /**
+       * Tests that for the Safari migrator without permissions, we show the
+       * normal resources list and impor tbutton instead of the no permissions
+       * message. Safari has a special flow where permissions are requested
+       * only after resource selection has occurred.
+       */
+      add_task(async function no_permissions_safari() {
+        const SOME_FAKE_PERMISSION_PATH = "/some/fake/safari/path";
+
+        gWiz.setState({
+          page: MigrationWizardConstants.PAGES.SELECTION,
+          migrators: [{
+            key: "safari",
+            type: MigrationWizardConstants.MIGRATOR_TYPES.BROWSER,
+            displayName: "Safari with no permissions",
+            resourceTypes: ["HISTORY", "BOOKMARKS"],
+            profile: null,
+            hasPermissions: false,
+            permissionsPath: SOME_FAKE_PERMISSION_PATH,
+          }],
+          showImportAll: false,
+        });
+
+        let selectionPage = gShadowRoot.querySelector("div[name='page-selection']");
+        ok(!selectionPage.hasAttribute("no-permissions"), "no-permissions attribute not set.");
+
+        let resourceList = gShadowRoot.querySelector(".resource-selection-details");
+        ok(!isHidden(resourceList), "Resources list is shown.");
+
+        let importButton = gShadowRoot.querySelector("#import");
+        ok(!isHidden(importButton), "Import button shown.");
+        let noPermissionsMessage = gShadowRoot.querySelector(".no-permissions-message");
+        ok(isHidden(noPermissionsMessage), "No permissions message hidden.");
+        let getPermissionButton = gShadowRoot.querySelector("#get-permissions");
+        ok(isHidden(getPermissionButton), "Get permissions button hiddne.");
+      });
+    </script>
+  </head>
+  <body>
+    <p id="display"></p>
+    <div id="content">
+      <migration-wizard id="test-wizard" dialog-mode=""></migration-wizard>
+    </div>
+    <pre id="test"></pre>
+  </body>
+</html>
diff --git a/browser/components/migration/tests/head-common.js b/browser/components/migration/tests/head-common.js
new file mode 100644
index 0000000000..025d3e5a16
--- /dev/null
+++ b/browser/components/migration/tests/head-common.js
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { MigrationWizardConstants } = ChromeUtils.importESModule(
+  "chrome://browser/content/migration/migration-wizard-constants.mjs"
+);
+
+/**
+ * Returns the constant strings from MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES
+ * that aren't also part of MigrationWizardConstants.PROFILE_RESET_ONLY_RESOURCE_TYPES.
+ *
+ * This is the set of resources that the user can actually choose to migrate via
+ * checkboxes.
+ *
+ * @returns {string[]}
+ */
+function getChoosableResourceTypes() {
+  return Object.keys(MigrationWizardConstants.DISPLAYED_RESOURCE_TYPES).filter(
+    resourceType =>
+      !MigrationWizardConstants.PROFILE_RESET_ONLY_RESOURCE_TYPES[resourceType]
+  );
+}
diff --git a/browser/components/migration/tests/marionette/manifest.toml b/browser/components/migration/tests/marionette/manifest.toml
new file mode 100644
index 0000000000..1e3b536ee2
--- /dev/null
+++ b/browser/components/migration/tests/marionette/manifest.toml
@@ -0,0 +1,4 @@
+[DEFAULT]
+run-if = ["buildapp == 'browser'"]
+
+["test_refresh_firefox.py"]
diff --git a/browser/components/migration/tests/marionette/test_refresh_firefox.py b/browser/components/migration/tests/marionette/test_refresh_firefox.py
new file mode 100644
index 0000000000..ea5d6bce99
--- /dev/null
+++ b/browser/components/migration/tests/marionette/test_refresh_firefox.py
@@ -0,0 +1,703 @@
+import os
+import time
+
+from marionette_driver.errors import NoAlertPresentException
+from marionette_harness import MarionetteTestCase
+
+
+# Holds info about things we need to cleanup after the tests are done.
+class PendingCleanup:
+    desktop_backup_path = None
+    reset_profile_path = None
+    reset_profile_local_path = None
+
+    def __init__(self, profile_name_to_remove):
+        self.profile_name_to_remove = profile_name_to_remove
+
+
+class TestFirefoxRefresh(MarionetteTestCase):
+    _sandbox = "firefox-refresh"
+
+    _username = "marionette-test-login"
+    _password = "marionette-test-password"
+    _bookmarkURL = "about:mozilla"
+    _bookmarkText = "Some bookmark from Marionette"
+
+    _cookieHost = "firefox-refresh.marionette-test.mozilla.org"
+    _cookiePath = "some/cookie/path"
+    _cookieName = "somecookie"
+    _cookieValue = "some cookie value"
+
+    _historyURL = "http://firefox-refresh.marionette-test.mozilla.org/"
+    _historyTitle = "Test visit for Firefox Reset"
+
+    _formHistoryFieldName = "some-very-unique-marionette-only-firefox-reset-field"
+    _formHistoryValue = "special-pumpkin-value"
+
+    _formAutofillAvailable = False
+    _formAutofillAddressGuid = None
+
+    _expectedURLs = ["about:robots", "about:mozilla"]
+
+    def savePassword(self):
+        self.runAsyncCode(
+            """
+          let [username, password, resolve] = arguments;
+          let myLogin = new global.LoginInfo(
+            "test.marionette.mozilla.com",
+            "http://test.marionette.mozilla.com/some/form/",
+            null,
+            username,
+            password,
+            "username",
+            "password"
+          );
+          Services.logins.addLoginAsync(myLogin)
+            .then(() => resolve(false), resolve);
+        """,
+            script_args=(self._username, self._password),
+        )
+
+    def createBookmarkInMenu(self):
+        error = self.runAsyncCode(
+            """
+          // let url = arguments[0];
+          // let title = arguments[1];
+          // let resolve = arguments[arguments.length - 1];
+          let [url, title, resolve] = arguments;
+          PlacesUtils.bookmarks.insert({
+            parentGuid: PlacesUtils.bookmarks.menuGuid, url, title
+          }).then(() => resolve(false), resolve);
+        """,
+            script_args=(self._bookmarkURL, self._bookmarkText),
+        )
+        if error:
+            print(error)
+
+    def createBookmarksOnToolbar(self):
+        error = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          let children = [];
+          for (let i = 1; i <= 5; i++) {
+            children.push({url: `about:rights?p=${i}`, title: `Bookmark ${i}`});
+          }
+          PlacesUtils.bookmarks.insertTree({
+            guid: PlacesUtils.bookmarks.toolbarGuid,
+            children
+          }).then(() => resolve(false), resolve);
+        """
+        )
+        if error:
+            print(error)
+
+    def createHistory(self):
+        error = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          PlacesUtils.history.insert({
+            url: arguments[0],
+            title: arguments[1],
+            visits: [{
+              date: new Date(Date.now() - 5000),
+              referrer: "about:mozilla"
+            }]
+          }).then(() => resolve(false),
+                  ex => resolve("Unexpected error in adding visit: " + ex));
+        """,
+            script_args=(self._historyURL, self._historyTitle),
+        )
+        if error:
+            print(error)
+
+    def createFormHistory(self):
+        error = self.runAsyncCode(
+            """
+          let updateDefinition = {
+            op: "add",
+            fieldname: arguments[0],
+            value: arguments[1],
+            firstUsed: (Date.now() - 5000) * 1000,
+          };
+          let resolve = arguments[arguments.length - 1];
+          global.FormHistory.update(updateDefinition).then(() => {
+            resolve(false);
+          }, error => {
+            resolve("Unexpected error in adding formhistory: " + error);
+          });
+        """,
+            script_args=(self._formHistoryFieldName, self._formHistoryValue),
+        )
+        if error:
+            print(error)
+
+    def createFormAutofill(self):
+        if not self._formAutofillAvailable:
+            return
+        self._formAutofillAddressGuid = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          const TEST_ADDRESS_1 = {
+            "given-name": "John",
+            "additional-name": "R.",
+            "family-name": "Smith",
+            organization: "World Wide Web Consortium",
+            "street-address": "32 Vassar Street\\\nMIT Room 32-G524",
+            "address-level2": "Cambridge",
+            "address-level1": "MA",
+            "postal-code": "02139",
+            country: "US",
+            tel: "+15195555555",
+            email: "user@example.com",
+          };
+          return global.formAutofillStorage.initialize().then(() => {
+            return global.formAutofillStorage.addresses.add(TEST_ADDRESS_1);
+          }).then(resolve);
+        """
+        )
+
+    def createCookie(self):
+        self.runCode(
+            """
+          // Expire in 15 minutes:
+          let expireTime = Math.floor(Date.now() / 1000) + 15 * 60;
+          Services.cookies.add(arguments[0], arguments[1], arguments[2], arguments[3],
+                               true, false, false, expireTime, {},
+                               Ci.nsICookie.SAMESITE_NONE, Ci.nsICookie.SCHEME_UNSET);
+        """,
+            script_args=(
+                self._cookieHost,
+                self._cookiePath,
+                self._cookieName,
+                self._cookieValue,
+            ),
+        )
+
+    def createSession(self):
+        self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          const COMPLETE_STATE = Ci.nsIWebProgressListener.STATE_STOP +
+                                 Ci.nsIWebProgressListener.STATE_IS_NETWORK;
+          let { TabStateFlusher } = ChromeUtils.importESModule(
+            "resource:///modules/sessionstore/TabStateFlusher.sys.mjs"
+          );
+          let expectedURLs = Array.from(arguments[0])
+          gBrowser.addTabsProgressListener({
+            onStateChange(browser, webprogress, request, flags, status) {
+              try {
+                request && request.QueryInterface(Ci.nsIChannel);
+              } catch (ex) {}
+              let uriLoaded = request.originalURI && request.originalURI.spec;
+              if ((flags & COMPLETE_STATE == COMPLETE_STATE) && uriLoaded &&
+                  expectedURLs.includes(uriLoaded)) {
+                TabStateFlusher.flush(browser).then(function() {
+                  expectedURLs.splice(expectedURLs.indexOf(uriLoaded), 1);
+                  if (!expectedURLs.length) {
+                    gBrowser.removeTabsProgressListener(this);
+                    resolve();
+                  }
+                });
+              }
+            }
+          });
+          let expectedTabs = new Set();
+          for (let url of expectedURLs) {
+            expectedTabs.add(gBrowser.addTab(url, {
+              triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+            }));
+          }
+          // Close any other tabs that might be open:
+          let allTabs = Array.from(gBrowser.tabs);
+          for (let tab of allTabs) {
+            if (!expectedTabs.has(tab)) {
+              gBrowser.removeTab(tab);
+            }
+          }
+        """,  # NOQA: E501
+            script_args=(self._expectedURLs,),
+        )
+
+    def createFxa(self):
+        # This script will write an entry to the login manager and create
+        # a signedInUser.json in the profile dir.
+        self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          let { FxAccountsStorageManager } = ChromeUtils.import(
+            "resource://gre/modules/FxAccountsStorage.jsm"
+          );
+          let storage = new FxAccountsStorageManager();
+          let data = {email: "test@test.com", uid: "uid", keyFetchToken: "top-secret"};
+          storage.initialize(data);
+          storage.finalize().then(resolve);
+        """
+        )
+
+    def createSync(self):
+        # This script will write the canonical preference which indicates a user
+        # is signed into sync.
+        self.marionette.execute_script(
+            """
+            Services.prefs.setStringPref("services.sync.username", "test@test.com");
+        """
+        )
+
+    def checkPassword(self):
+        loginInfo = self.runAsyncCode(
+            """
+          let [resolve] = arguments;
+          Services.logins.searchLoginsAsync({
+            origin: "test.marionette.mozilla.com",
+            formActionOrigin: "http://test.marionette.mozilla.com/some/form/",
+          }).then(ary => resolve(ary.length ? ary : {username: "null", password: "null"}));
+        """
+        )
+        self.assertEqual(len(loginInfo), 1)
+        self.assertEqual(loginInfo[0]["username"], self._username)
+        self.assertEqual(loginInfo[0]["password"], self._password)
+
+        loginCount = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          Services.logins.getAllLogins().then(logins => resolve(logins.length));
+        """
+        )
+        # Note that we expect 2 logins - one from us, one from sync.
+        self.assertEqual(loginCount, 2, "No other logins are present")
+
+    def checkBookmarkInMenu(self):
+        titleInBookmarks = self.runAsyncCode(
+            """
+          let [url, resolve] = arguments;
+          PlacesUtils.bookmarks.fetch({url}).then(
+            bookmark => resolve(bookmark ? bookmark.title : ""),
+            ex => resolve(ex)
+          );
+        """,
+            script_args=(self._bookmarkURL,),
+        )
+        self.assertEqual(titleInBookmarks, self._bookmarkText)
+
+    def checkBookmarkToolbarVisibility(self):
+        toolbarVisible = self.marionette.execute_script(
+            """
+          const BROWSER_DOCURL = AppConstants.BROWSER_CHROME_URL;
+          return Services.xulStore.getValue(BROWSER_DOCURL, "PersonalToolbar", "collapsed");
+        """
+        )
+        if toolbarVisible == "":
+            toolbarVisible = "false"
+        self.assertEqual(toolbarVisible, "false")
+
+    def checkHistory(self):
+        historyResult = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          PlacesUtils.history.fetch(arguments[0]).then(pageInfo => {
+            if (!pageInfo) {
+              resolve("No visits found");
+            } else {
+              resolve(pageInfo);
+            }
+          }).catch(e => {
+            resolve("Unexpected error in fetching page: " + e);
+          });
+        """,
+            script_args=(self._historyURL,),
+        )
+        if type(historyResult) == str:
+            self.fail(historyResult)
+            return
+
+        self.assertEqual(historyResult["title"], self._historyTitle)
+
+    def checkFormHistory(self):
+        formFieldResults = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          let results = [];
+          global.FormHistory.search(["value"], {fieldname: arguments[0]})
+            .then(resolve);
+        """,
+            script_args=(self._formHistoryFieldName,),
+        )
+        if type(formFieldResults) == str:
+            self.fail(formFieldResults)
+            return
+
+        formFieldResultCount = len(formFieldResults)
+        self.assertEqual(
+            formFieldResultCount,
+            1,
+            "Should have exactly 1 entry for this field, got %d" % formFieldResultCount,
+        )
+        if formFieldResultCount == 1:
+            self.assertEqual(formFieldResults[0]["value"], self._formHistoryValue)
+
+        formHistoryCount = self.runAsyncCode(
+            """
+          let [resolve] = arguments;
+          global.FormHistory.count({}).then(resolve);
+        """
+        )
+        self.assertEqual(
+            formHistoryCount, 1, "There should be only 1 entry in the form history"
+        )
+
+    def checkFormAutofill(self):
+        if not self._formAutofillAvailable:
+            return
+
+        formAutofillResults = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1];
+          return global.formAutofillStorage.initialize().then(() => {
+            return global.formAutofillStorage.addresses.getAll()
+          }).then(resolve);
+        """,
+        )
+        if type(formAutofillResults) == str:
+            self.fail(formAutofillResults)
+            return
+
+        formAutofillAddressCount = len(formAutofillResults)
+        self.assertEqual(
+            formAutofillAddressCount,
+            1,
+            "Should have exactly 1 saved address, got %d" % formAutofillAddressCount,
+        )
+        if formAutofillAddressCount == 1:
+            self.assertEqual(
+                formAutofillResults[0]["guid"], self._formAutofillAddressGuid
+            )
+
+    def checkCookie(self):
+        cookieInfo = self.runCode(
+            """
+          try {
+            let cookies = Services.cookies.getCookiesFromHost(arguments[0], {});
+            let cookie = null;
+            for (let hostCookie of cookies) {
+              // getCookiesFromHost returns any cookie from the BASE host.
+              if (hostCookie.rawHost != arguments[0])
+                continue;
+              if (cookie != null) {
+                return "more than 1 cookie! That shouldn't happen!";
+              }
+              cookie = hostCookie;
+            }
+            return {path: cookie.path, name: cookie.name, value: cookie.value};
+          } catch (ex) {
+            return "got exception trying to fetch cookie: " + ex;
+          }
+        """,
+            script_args=(self._cookieHost,),
+        )
+        if not isinstance(cookieInfo, dict):
+            self.fail(cookieInfo)
+            return
+        self.assertEqual(cookieInfo["path"], self._cookiePath)
+        self.assertEqual(cookieInfo["value"], self._cookieValue)
+        self.assertEqual(cookieInfo["name"], self._cookieName)
+
+    def checkSession(self):
+        tabURIs = self.runCode(
+            """
+          return [... gBrowser.browsers].map(b => b.currentURI && b.currentURI.spec)
+        """
+        )
+        self.assertSequenceEqual(tabURIs, ["about:welcomeback"])
+
+        # Dismiss modal dialog if any. This is mainly to dismiss the check for
+        # default browser dialog if it shows up.
+        try:
+            alert = self.marionette.switch_to_alert()
+            alert.dismiss()
+        except NoAlertPresentException:
+            pass
+
+        tabURIs = self.runAsyncCode(
+            """
+          let resolve = arguments[arguments.length - 1]
+          let mm = gBrowser.selectedBrowser.messageManager;
+
+          window.addEventListener("SSWindowStateReady", function() {
+            window.addEventListener("SSTabRestored", function() {
+              resolve(Array.from(gBrowser.browsers, b => b.currentURI?.spec));
+            }, { capture: false, once: true });
+          }, { capture: false, once: true });
+
+          let fs = function() {
+            if (content.document.readyState === "complete") {
+              content.document.getElementById("errorTryAgain").click();
+            } else {
+              content.window.addEventListener("load", function(event) {
+                content.document.getElementById("errorTryAgain").click();
+              }, { once: true });
+            }
+          };
+
+          Services.prefs.setBoolPref("security.allow_parent_unrestricted_js_loads", true);
+          mm.loadFrameScript("data:application/javascript,(" + fs.toString() + ")()", true);
+          Services.prefs.setBoolPref("security.allow_parent_unrestricted_js_loads", false);
+        """  # NOQA: E501
+        )
+        self.assertSequenceEqual(tabURIs, self._expectedURLs)
+
+    def checkFxA(self):
+        result = self.runAsyncCode(
+            """
+          let { FxAccountsStorageManager } = ChromeUtils.import(
+            "resource://gre/modules/FxAccountsStorage.jsm"
+          );
+          let resolve = arguments[arguments.length - 1];
+          let storage = new FxAccountsStorageManager();
+          let result = {};
+          storage.initialize();
+          storage.getAccountData().then(data => {
+            result.accountData = data;
+            return storage.finalize();
+          }).then(() => {
+            resolve(result);
+          }).catch(err => {
+            resolve(err.toString());
+          });
+        """
+        )
+        if type(result) != dict:
+            self.fail(result)
+            return
+        self.assertEqual(result["accountData"]["email"], "test@test.com")
+        self.assertEqual(result["accountData"]["uid"], "uid")
+        self.assertEqual(result["accountData"]["keyFetchToken"], "top-secret")
+
+    def checkSync(self, expect_sync_user):
+        pref_value = self.marionette.execute_script(
+            """
+            return Services.prefs.getStringPref("services.sync.username", null);
+        """
+        )
+        expected_value = "test@test.com" if expect_sync_user else None
+        self.assertEqual(pref_value, expected_value)
+
+    def checkStartupMigrationStateCleared(self):
+        result = self.runCode(
+            """
+          let { MigrationUtils } = ChromeUtils.importESModule(
+            "resource:///modules/MigrationUtils.sys.mjs"
+          );
+          return MigrationUtils.isStartupMigration;
+        """
+        )
+        self.assertFalse(result)
+
+    def checkProfile(self, has_migrated=False, expect_sync_user=True):
+        self.checkPassword()
+        self.checkBookmarkInMenu()
+        self.checkHistory()
+        self.checkFormHistory()
+        self.checkFormAutofill()
+        self.checkCookie()
+        self.checkFxA()
+        self.checkSync(expect_sync_user)
+        if has_migrated:
+            self.checkBookmarkToolbarVisibility()
+            self.checkSession()
+            self.checkStartupMigrationStateCleared()
+
+    def createProfileData(self):
+        self.savePassword()
+        self.createBookmarkInMenu()
+        self.createBookmarksOnToolbar()
+        self.createHistory()
+        self.createFormHistory()
+        self.createFormAutofill()
+        self.createCookie()
+        self.createSession()
+        self.createFxa()
+        self.createSync()
+
+    def setUpScriptData(self):
+        self.marionette.set_context(self.marionette.CONTEXT_CHROME)
+        self.runCode(
+            """
+          window.global = {};
+          global.LoginInfo = Components.Constructor("@mozilla.org/login-manager/loginInfo;1", "nsILoginInfo", "init");
+          global.profSvc = Cc["@mozilla.org/toolkit/profile-service;1"].getService(Ci.nsIToolkitProfileService);
+          global.Preferences = ChromeUtils.importESModule(
+            "resource://gre/modules/Preferences.sys.mjs"
+          ).Preferences;
+          global.FormHistory = ChromeUtils.import(
+            "resource://gre/modules/FormHistory.jsm"
+          ).FormHistory;
+        """  # NOQA: E501
+        )
+        self._formAutofillAvailable = self.runCode(
+            """
+          try {
+            global.formAutofillStorage = ChromeUtils.import(
+              "resource://formautofill/FormAutofillStorage.jsm"
+            ).formAutofillStorage;
+          } catch(e) {
+            return false;
+          }
+          return true;
+        """  # NOQA: E501
+        )
+
+    def runCode(self, script, *args, **kwargs):
+        return self.marionette.execute_script(
+            script, new_sandbox=False, sandbox=self._sandbox, *args, **kwargs
+        )
+
+    def runAsyncCode(self, script, *args, **kwargs):
+        return self.marionette.execute_async_script(
+            script, new_sandbox=False, sandbox=self._sandbox, *args, **kwargs
+        )
+
+    def setUp(self):
+        MarionetteTestCase.setUp(self)
+        self.setUpScriptData()
+
+        self.cleanups = []
+
+    def tearDown(self):
+        # Force yet another restart with a clean profile to disconnect from the
+        # profile and environment changes we've made, to leave a more or less
+        # blank slate for the next person.
+        self.marionette.restart(in_app=False, clean=True)
+        self.setUpScriptData()
+
+        # Super
+        MarionetteTestCase.tearDown(self)
+
+        # A helper to deal with removing a load of files
+        import mozfile
+
+        for cleanup in self.cleanups:
+            if cleanup.desktop_backup_path:
+                mozfile.remove(cleanup.desktop_backup_path)
+
+            if cleanup.reset_profile_path:
+                # Remove ourselves from profiles.ini
+                self.runCode(
+                    """
+                  let name = arguments[0];
+                  let profile = global.profSvc.getProfileByName(name);
+                  profile.remove(false)
+                  global.profSvc.flush();
+                """,
+                    script_args=(cleanup.profile_name_to_remove,),
+                )
+                # Remove the local profile dir if it's not the same as the profile dir:
+                different_path = (
+                    cleanup.reset_profile_local_path != cleanup.reset_profile_path
+                )
+                if cleanup.reset_profile_local_path and different_path:
+                    mozfile.remove(cleanup.reset_profile_local_path)
+
+                # And delete all the files.
+                mozfile.remove(cleanup.reset_profile_path)
+
+    def doReset(self):
+        profileName = "marionette-test-profile-" + str(int(time.time() * 1000))
+        cleanup = PendingCleanup(profileName)
+        self.runCode(
+            """
+          // Ensure the current (temporary) profile is in profiles.ini:
+          let profD = Services.dirsvc.get("ProfD", Ci.nsIFile);
+          let profileName = arguments[1];
+          let myProfile = global.profSvc.createProfile(profD, profileName);
+          global.profSvc.flush()
+
+          // Now add the reset parameters:
+          let prefsToKeep = Array.from(Services.prefs.getChildList("marionette."));
+          // Add all the modified preferences set from geckoinstance.py to avoid
+          // non-local connections.
+          prefsToKeep = prefsToKeep.concat(JSON.parse(
+              Services.env.get("MOZ_MARIONETTE_REQUIRED_PREFS")));
+          let prefObj = {};
+          for (let pref of prefsToKeep) {
+            prefObj[pref] = global.Preferences.get(pref);
+          }
+          Services.env.set("MOZ_MARIONETTE_PREF_STATE_ACROSS_RESTARTS", JSON.stringify(prefObj));
+          Services.env.set("MOZ_RESET_PROFILE_RESTART", "1");
+          Services.env.set("XRE_PROFILE_PATH", arguments[0]);
+        """,
+            script_args=(
+                self.marionette.instance.profile.profile,
+                profileName,
+            ),
+        )
+
+        profileLeafName = os.path.basename(
+            os.path.normpath(self.marionette.instance.profile.profile)
+        )
+
+        # Now restart the browser to get it reset:
+        self.marionette.restart(clean=False, in_app=True)
+        self.setUpScriptData()
+
+        # Determine the new profile path (we'll need to remove it when we're done)
+        [cleanup.reset_profile_path, cleanup.reset_profile_local_path] = self.runCode(
+            """
+          let profD = Services.dirsvc.get("ProfD", Ci.nsIFile);
+          let localD = Services.dirsvc.get("ProfLD", Ci.nsIFile);
+          return [profD.path, localD.path];
+        """
+        )
+
+        # Determine the backup path
+        cleanup.desktop_backup_path = self.runCode(
+            """
+          let container;
+          try {
+            container = Services.dirsvc.get("Desk", Ci.nsIFile);
+          } catch (ex) {
+            container = Services.dirsvc.get("Home", Ci.nsIFile);
+          }
+          let bundle = Services.strings.createBundle("chrome://mozapps/locale/profile/profileSelection.properties");
+          let dirName = bundle.formatStringFromName("resetBackupDirectory", [Services.appinfo.name]);
+          container.append(dirName);
+          container.append(arguments[0]);
+          return container.path;
+        """,  # NOQA: E501
+            script_args=(profileLeafName,),
+        )
+
+        self.assertTrue(
+            os.path.isdir(cleanup.reset_profile_path),
+            "Reset profile path should be present",
+        )
+        self.assertTrue(
+            os.path.isdir(cleanup.desktop_backup_path),
+            "Backup profile path should be present",
+        )
+        self.assertIn(cleanup.profile_name_to_remove, cleanup.reset_profile_path)
+        return cleanup
+
+    def testResetEverything(self):
+        self.createProfileData()
+
+        self.checkProfile(expect_sync_user=True)
+
+        this_cleanup = self.doReset()
+        self.cleanups.append(this_cleanup)
+
+        # Now check that we're doing OK...
+        self.checkProfile(has_migrated=True, expect_sync_user=True)
+
+    def testFxANoSync(self):
+        # This test doesn't need to repeat all the non-sync tests...
+        # Setup FxA but *not* sync
+        self.createFxa()
+
+        self.checkFxA()
+        self.checkSync(False)
+
+        this_cleanup = self.doReset()
+        self.cleanups.append(this_cleanup)
+
+        self.checkFxA()
+        self.checkSync(False)
diff --git a/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Favicons b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Favicons
new file mode 100644
index 0000000000..fddee798b3
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Favicons
diff --git a/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Login Data b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Login Data
new file mode 100644
index 0000000000..7e6e843a03
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Login Data
diff --git a/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Web Data b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Web Data
new file mode 100644
index 0000000000..c557c9b851
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Default/Web Data
diff --git a/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Local State b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Local State
new file mode 100644
index 0000000000..3f3fecb651
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Local/Google/Chrome/User Data/Local State
@@ -0,0 +1,5 @@
+{
+  "os_crypt" : {
+    "encrypted_key" : "RFBBUEk/ThisNPAPIKeyCanOnlyBeDecryptedByTheOriginalDeviceSoThisWillThrowFromDecryptData"
+  }
+}
diff --git a/browser/components/migration/tests/unit/AppData/LocalWithNoData/Google/Chrome/User Data/Default/Login Data b/browser/components/migration/tests/unit/AppData/LocalWithNoData/Google/Chrome/User Data/Default/Login Data
new file mode 100644
index 0000000000..fd135624c4
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/LocalWithNoData/Google/Chrome/User Data/Default/Login Data
diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat
new file mode 100644
index 0000000000..1835c33583
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat
diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/360Bookmarks b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/360Bookmarks
new file mode 100644
index 0000000000..f51195f54c
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/360Bookmarks
@@ -0,0 +1 @@
+Encrypted canonical bookmarks storage, since 360 SE 10

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2020_08_28.favdb b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2020_08_28.favdb
new file mode 100644
index 0000000000..ea466a25bf
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2020_08_28.favdb
@@ -0,0 +1,3 @@
+{

+    "note": "Plain text bookmarks backup, since 360 SE 10."

+}

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2021_12_02.favdb b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2021_12_02.favdb
new file mode 100644
index 0000000000..ea466a25bf
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360default_ori_2021_12_02.favdb
@@ -0,0 +1,3 @@
+{

+    "note": "Plain text bookmarks backup, since 360 SE 10."

+}

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2020_08_28.favdb b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2020_08_28.favdb
new file mode 100644
index 0000000000..32b4002a32
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2020_08_28.favdb
@@ -0,0 +1 @@
+Encrypted bookmarks backup, since 360 SE 10.

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2021_12_02.favdb b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2021_12_02.favdb
new file mode 100644
index 0000000000..32b4002a32
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default/DailyBackup/360sefav_new_2021_12_02.favdb
@@ -0,0 +1 @@
+Encrypted bookmarks backup, since 360 SE 10.

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat
new file mode 100644
index 0000000000..440e7145bd
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/360sefav.dat
@@ -0,0 +1 @@
+Bookmarks storage in legacy SQLite format.

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/DailyBackup/360sefav_2020_08_28.favdb b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/DailyBackup/360sefav_2020_08_28.favdb
new file mode 100644
index 0000000000..d5d939629c
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/0f3ab103a522f4463ecacc36d34eb996/DailyBackup/360sefav_2020_08_28.favdb
@@ -0,0 +1,3 @@
+{

+    "note": "Plain text bookmarks backup, 360 SE 9."

+}

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/Bookmarks b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/Bookmarks
new file mode 100644
index 0000000000..6f47e5a55c
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Default4SE9Test/Bookmarks
@@ -0,0 +1,3 @@
+{

+    "note": "Plain text canonical bookmarks storage, 360 SE 9."

+}

diff --git a/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Local State b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Local State
new file mode 100644
index 0000000000..dd3fecce45
--- /dev/null
+++ b/browser/components/migration/tests/unit/AppData/Roaming/360se6/User Data/Local State
@@ -0,0 +1,12 @@
+{

+    "profile": {

+        "info_cache": {

+            "Default": {

+                "name": "用户1"

+            }

+        }

+    },

+    "sync_login_info": {

+        "filepath": "0f3ab103a522f4463ecacc36d34eb996"

+    }

+}

diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Cookies b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Cookies
new file mode 100644
index 0000000000..83d855cb33
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Cookies
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/_locales/en_US/messages.json b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/_locales/en_US/messages.json
new file mode 100644
index 0000000000..44e855edbd
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/_locales/en_US/messages.json
@@ -0,0 +1,9 @@
+{
+   "description": {
+      "description": "Extension description in manifest. Should not exceed 132 characters.",
+      "message": "It is the description of fake app 1."
+   },
+   "name": {
+      "message": "Fake App 1"
+   }
+}
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/manifest.json b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/manifest.json
new file mode 100644
index 0000000000..1550bf1c0e
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-app-1/1.0_0/manifest.json
@@ -0,0 +1,10 @@
+{
+   "app": {
+      "launch": {
+         "local_path": "main.html"
+      }
+   },
+   "default_locale": "en_US",
+   "description": "__MSG_description__",
+   "name": "__MSG_name__"
+}
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/_locales/en_US/messages.json b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/_locales/en_US/messages.json
new file mode 100644
index 0000000000..11657460d8
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/_locales/en_US/messages.json
@@ -0,0 +1,9 @@
+{
+   "description": {
+      "description": "Extension description in manifest. Should not exceed 132 characters.",
+      "message": "It is the description of fake extension 1."
+   },
+   "name": {
+      "message": "Fake Extension 1"
+   }
+}
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/manifest.json b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/manifest.json
new file mode 100644
index 0000000000..5ceced8031
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-1/1.0_0/manifest.json
@@ -0,0 +1,5 @@
+{
+   "default_locale": "en_US",
+   "description": "__MSG_description__",
+   "name": "__MSG_name__"
+}
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-2/1.0_0/manifest.json b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-2/1.0_0/manifest.json
new file mode 100644
index 0000000000..983c37560c
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Extensions/fake-extension-2/1.0_0/manifest.json
@@ -0,0 +1,4 @@
+{
+   "default_locale": "en_US",
+   "name": "Fake Extension 2"
+}
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryCorrupt b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryCorrupt
new file mode 100644
index 0000000000..8585f308c5
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryCorrupt
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryMaster b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryMaster
new file mode 100644
index 0000000000..7fb19903b0
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/HistoryMaster
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Login Data b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Login Data
new file mode 100644
index 0000000000..19b8542b98
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Default/Login Data
diff --git a/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Local State b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Local State
new file mode 100644
index 0000000000..01b99455e4
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Application Support/Google/Chrome/Local State
@@ -0,0 +1,22 @@
+{
+  "profile" : {
+    "info_cache" : {
+      "Default" : {
+        "active_time" : 1430950755.65137,
+        "is_using_default_name" : true,
+        "is_ephemeral" : false,
+        "is_omitted_from_profile_list" : false,
+        "user_name" : "",
+        "background_apps" : false,
+        "is_using_default_avatar" : true,
+        "avatar_icon" : "chrome://theme/IDR_PROFILE_AVATAR_0",
+        "name" : "Person 1"
+      }
+    },
+    "profiles_created" : 1,
+    "last_used" : "Default",
+    "last_active_profiles" : [
+      "Default"
+    ]
+  }
+}
diff --git a/browser/components/migration/tests/unit/Library/Safari/Bookmarks.plist b/browser/components/migration/tests/unit/Library/Safari/Bookmarks.plist
new file mode 100644
index 0000000000..a9c33e1b1a
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Bookmarks.plist
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db
new file mode 100644
index 0000000000..dd5d0c7512
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-lock b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-lock
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-lock
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-shm b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-shm
new file mode 100644
index 0000000000..edd607898b
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-shm
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-wal b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-wal
new file mode 100644
index 0000000000..e145119298
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons.db-wal
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/04860FA3D07D8936B87D2B965317C6E9 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/04860FA3D07D8936B87D2B965317C6E9
new file mode 100644
index 0000000000..1c6741c165
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/04860FA3D07D8936B87D2B965317C6E9
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/19A777E4F7BDA0C0E350D6C681B6E271 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/19A777E4F7BDA0C0E350D6C681B6E271
new file mode 100644
index 0000000000..47b40f707f
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/19A777E4F7BDA0C0E350D6C681B6E271
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/2558A57A1AE576AA31F0DCD1364B3F42 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/2558A57A1AE576AA31F0DCD1364B3F42
new file mode 100644
index 0000000000..2a4c30b31e
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/2558A57A1AE576AA31F0DCD1364B3F42
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/57D1907A1EBDA1889AA85B8AB7A90804 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/57D1907A1EBDA1889AA85B8AB7A90804
new file mode 100644
index 0000000000..f4996ba082
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/57D1907A1EBDA1889AA85B8AB7A90804
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/6EEDD53B65A19CB364EB6FB07DEACF80 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/6EEDD53B65A19CB364EB6FB07DEACF80
new file mode 100644
index 0000000000..f519ce9ad2
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/6EEDD53B65A19CB364EB6FB07DEACF80
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/7F65370AD319C7B294EDF2E2BEBA880F b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/7F65370AD319C7B294EDF2E2BEBA880F
new file mode 100644
index 0000000000..e70021849b
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/7F65370AD319C7B294EDF2E2BEBA880F
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/999E2BD5CD612AA550F222A1088DB3D8 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/999E2BD5CD612AA550F222A1088DB3D8
new file mode 100644
index 0000000000..559502b02b
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/999E2BD5CD612AA550F222A1088DB3D8
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/9D8A6E2153D42043A7AE0430B41D374A b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/9D8A6E2153D42043A7AE0430B41D374A
new file mode 100644
index 0000000000..89ed9a1c39
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/9D8A6E2153D42043A7AE0430B41D374A
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/A21F634481CF5188329FD2052F07ADBC b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/A21F634481CF5188329FD2052F07ADBC
new file mode 100644
index 0000000000..7b86185e67
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/A21F634481CF5188329FD2052F07ADBC
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/BC2288B5BA9B7BE352BA586257442E08 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/BC2288B5BA9B7BE352BA586257442E08
new file mode 100644
index 0000000000..a1d03856b5
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/BC2288B5BA9B7BE352BA586257442E08
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/CFFC3831D8E7201BF8B77728FC79B52B b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/CFFC3831D8E7201BF8B77728FC79B52B
new file mode 100644
index 0000000000..ba1145ca83
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/CFFC3831D8E7201BF8B77728FC79B52B
diff --git a/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/F3FA61DDA95B78A8B5F2C392C0382137 b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/F3FA61DDA95B78A8B5F2C392C0382137
new file mode 100644
index 0000000000..82339b3b1d
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/Favicon Cache/favicons/F3FA61DDA95B78A8B5F2C392C0382137
diff --git a/browser/components/migration/tests/unit/Library/Safari/HistoryStrangeEntries.db b/browser/components/migration/tests/unit/Library/Safari/HistoryStrangeEntries.db
new file mode 100644
index 0000000000..533daba3df
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/HistoryStrangeEntries.db
diff --git a/browser/components/migration/tests/unit/Library/Safari/HistoryTemplate.db b/browser/components/migration/tests/unit/Library/Safari/HistoryTemplate.db
new file mode 100644
index 0000000000..5a317c70e8
--- /dev/null
+++ b/browser/components/migration/tests/unit/Library/Safari/HistoryTemplate.db
diff --git a/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Default/Login Data b/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Default/Login Data
new file mode 100644
index 0000000000..b2d425eb4a
--- /dev/null
+++ b/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Default/Login Data
diff --git a/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Local State b/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Local State
new file mode 100644
index 0000000000..bb03d6b9a1
--- /dev/null
+++ b/browser/components/migration/tests/unit/LibraryWithNoData/Application Support/Google/Chrome/Local State
@@ -0,0 +1,22 @@
+{
+  "profile" : {
+    "info_cache" : {
+      "Default" : {
+        "active_time" : 1430950755.65137,
+        "is_using_default_name" : true,
+        "is_ephemeral" : false,
+        "is_omitted_from_profile_list" : false,
+        "user_name" : "",
+        "background_apps" : false,
+        "is_using_default_avatar" : true,
+        "avatar_icon" : "chrome://theme/IDR_PROFILE_AVATAR_0",
+        "name" : "Person With No Data"
+      }
+    },
+    "profiles_created" : 1,
+    "last_used" : "Default",
+    "last_active_profiles" : [
+      "Default"
+    ]
+  }
+}
diff --git a/browser/components/migration/tests/unit/bookmarks.exported.html b/browser/components/migration/tests/unit/bookmarks.exported.html
new file mode 100644
index 0000000000..5a9ec43325
--- /dev/null
+++ b/browser/components/migration/tests/unit/bookmarks.exported.html
@@ -0,0 +1,32 @@
+<!DOCTYPE NETSCAPE-Bookmark-file-1>
+<!-- This is an automatically generated file.
+     It will be read and overwritten.
+     DO NOT EDIT! -->
+<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
+<meta http-equiv="Content-Security-Policy"
+      content="default-src 'self'; script-src 'none'; img-src data: *; object-src 'none'"></meta>
+<TITLE>Bookmarks</TITLE>
+<H1>Bookmarks Menu</H1>
+
+<DL><p>
+    <DT><H3 ADD_DATE="1685118888" LAST_MODIFIED="1685118888">Mozilla Firefox</H3>
+    <DL><p>
+        <DT><A HREF="http://en-us.www.mozilla.com/en-US/firefox/help/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888" ICON_URI="fake-favicon-uri:http://en-us.www.mozilla.com/en-US/firefox/help/" ICON="data:image/png;base64,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">Help and Tutorials</A>
+        <DT><A HREF="http://en-us.www.mozilla.com/en-US/firefox/customize/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888" ICON_URI="fake-favicon-uri:http://en-us.www.mozilla.com/en-US/firefox/customize/" ICON="data:image/png;base64,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">Customize Firefox</A>
+        <DT><A HREF="http://en-us.www.mozilla.com/en-US/firefox/community/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888" ICON_URI="fake-favicon-uri:http://en-us.www.mozilla.com/en-US/firefox/community/" ICON="data:image/png;base64,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">Get Involved</A>
+        <DT><A HREF="http://en-us.www.mozilla.com/en-US/about/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888" ICON_URI="fake-favicon-uri:http://en-us.www.mozilla.com/en-US/about/" ICON="data:image/png;base64,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">About Us</A>
+    </DL><p>
+    <HR>    <DT><H3 ADD_DATE="1177541020" LAST_MODIFIED="1177541050">test</H3>
+    <DL><p>
+        <DT><A HREF="http://test/post" ADD_DATE="1177375336" LAST_MODIFIED="1177375423" SHORTCUTURL="test" POST_DATA="hidden1%3Dbar&amp;text1%3D%25s" LAST_CHARSET="ISO-8859-1">test post keyword</A>
+    </DL><p>
+    <DT><H3 ADD_DATE="1685118888" LAST_MODIFIED="1685118888" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks Toolbar</H3>
+    <DL><p>
+        <DT><A HREF="http://en-us.www.mozilla.com/en-US/firefox/central/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888" ICON_URI="fake-favicon-uri:http://en-us.www.mozilla.com/en-US/firefox/central/" ICON="data:image/png;base64,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">Getting Started</A>
+        <DT><A HREF="http://en-us.fxfeeds.mozilla.com/en-US/firefox/livebookmarks/" ADD_DATE="1177541035" LAST_MODIFIED="1177541035">Latest Headlines</A>
+    </DL><p>
+    <DT><H3 ADD_DATE="1685118888" LAST_MODIFIED="1685118888" UNFILED_BOOKMARKS_FOLDER="true">Other Bookmarks</H3>
+    <DL><p>
+        <DT><A HREF="http://example.tld/" ADD_DATE="1685118888" LAST_MODIFIED="1685118888">Example.tld</A>
+    </DL><p>
+</DL>
diff --git a/browser/components/migration/tests/unit/bookmarks.exported.json b/browser/components/migration/tests/unit/bookmarks.exported.json
new file mode 100644
index 0000000000..2a73f00b31
--- /dev/null
+++ b/browser/components/migration/tests/unit/bookmarks.exported.json
@@ -0,0 +1,194 @@
+{
+  "guid": "root________",
+  "title": "",
+  "index": 0,
+  "dateAdded": 1685116351936000,
+  "lastModified": 1685372151518000,
+  "id": 1,
+  "typeCode": 2,
+  "type": "text/x-moz-place-container",
+  "root": "placesRoot",
+  "children": [
+    {
+      "guid": "menu________",
+      "title": "menu",
+      "index": 0,
+      "dateAdded": 1685116351936000,
+      "lastModified": 1685116352325000,
+      "id": 2,
+      "typeCode": 2,
+      "type": "text/x-moz-place-container",
+      "root": "bookmarksMenuFolder",
+      "children": [
+        {
+          "guid": "jCs_9YrgXKq7",
+          "title": "Firefox Nightly Resources",
+          "index": 0,
+          "dateAdded": 1685116352325000,
+          "lastModified": 1685116352325000,
+          "id": 7,
+          "typeCode": 2,
+          "type": "text/x-moz-place-container",
+          "children": [
+            {
+              "guid": "xwdRLsUWYFwm",
+              "title": "Firefox Nightly blog",
+              "index": 0,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 8,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:https://blog.nightly.mozilla.org/",
+              "type": "text/x-moz-place",
+              "uri": "https://blog.nightly.mozilla.org/"
+            },
+            {
+              "guid": "uhdiDrWjH0-n",
+              "title": "Mozilla Bug Tracker",
+              "index": 1,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 9,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:https://bugzilla.mozilla.org/",
+              "type": "text/x-moz-place",
+              "uri": "https://bugzilla.mozilla.org/",
+              "keyword": "bz",
+              "postData": null
+            },
+            {
+              "guid": "zOK7d-gjJ5Vy",
+              "title": "Mozilla Developer Network",
+              "index": 2,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 10,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:https://developer.mozilla.org/",
+              "type": "text/x-moz-place",
+              "uri": "https://developer.mozilla.org/",
+              "keyword": "mdn",
+              "postData": null
+            },
+            {
+              "guid": "7gcb4320A_y6",
+              "title": "Nightly Tester Tools",
+              "index": 3,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 11,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:https://addons.mozilla.org/firefox/addon/nightly-tester-tools/",
+              "type": "text/x-moz-place",
+              "uri": "https://addons.mozilla.org/firefox/addon/nightly-tester-tools/"
+            },
+            {
+              "guid": "c4753lDvJwNE",
+              "title": "All your crashes",
+              "index": 4,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 12,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:about:crashes",
+              "type": "text/x-moz-place",
+              "uri": "about:crashes"
+            },
+            {
+              "guid": "IyYGIH9VCs2t",
+              "title": "Planet Mozilla",
+              "index": 5,
+              "dateAdded": 1685116352325000,
+              "lastModified": 1685116352325000,
+              "id": 13,
+              "typeCode": 1,
+              "iconUri": "fake-favicon-uri:https://planet.mozilla.org/",
+              "type": "text/x-moz-place",
+              "uri": "https://planet.mozilla.org/"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "guid": "toolbar_____",
+      "title": "toolbar",
+      "index": 1,
+      "dateAdded": 1685116351936000,
+      "lastModified": 1685372151518000,
+      "id": 3,
+      "typeCode": 2,
+      "type": "text/x-moz-place-container",
+      "root": "toolbarFolder",
+      "children": [
+        {
+          "guid": "5jN1vdzOEnHx",
+          "title": "Get Involved",
+          "index": 0,
+          "dateAdded": 1685116352413000,
+          "lastModified": 1685116352413000,
+          "id": 14,
+          "typeCode": 1,
+          "iconUri": "fake-favicon-uri:https://www.mozilla.org/contribute/?utm_medium=firefox-desktop&utm_source=bookmarks-toolbar&utm_campaign=new-users-nightly&utm_content=-global",
+          "type": "text/x-moz-place",
+          "uri": "https://www.mozilla.org/contribute/?utm_medium=firefox-desktop&utm_source=bookmarks-toolbar&utm_campaign=new-users-nightly&utm_content=-global"
+        },
+        {
+          "guid": "5RsMT9sWsmIe",
+          "title": "Why More Psychiatrists Think Mindfulness Can Help Treat ADHD",
+          "index": 1,
+          "dateAdded": 1685372143048000,
+          "lastModified": 1685372143048000,
+          "id": 15,
+          "typeCode": 1,
+          "type": "text/x-moz-place",
+          "uri": "https://getpocket.com/explore/item/why-more-psychiatrists-think-mindfulness-can-help-treat-adhd?utm_source=pocket-newtab"
+        },
+        {
+          "guid": "ejoNUqAfEMQL",
+          "title": "Your New Favorite Weeknight Recipe Is Meat-Free (and Easy, Too)",
+          "index": 2,
+          "dateAdded": 1685372148200000,
+          "lastModified": 1685372148200000,
+          "id": 16,
+          "typeCode": 1,
+          "type": "text/x-moz-place",
+          "uri": "https://getpocket.com/collections/your-new-favorite-weeknight-recipe-is-meat-free-and-easy-too?utm_source=pocket-newtab"
+        },
+        {
+          "guid": "O5QCiQ1zrqHY",
+          "title": "8 Natural Ways to Repel Insects Without Bug Spray",
+          "index": 3,
+          "dateAdded": 1685372151518000,
+          "lastModified": 1685372151518000,
+          "id": 17,
+          "typeCode": 1,
+          "type": "text/x-moz-place",
+          "uri": "https://getpocket.com/explore/item/8-natural-ways-to-repel-insects-without-bug-spray?utm_source=pocket-newtab"
+        }
+      ]
+    },
+    {
+      "guid": "unfiled_____",
+      "title": "unfiled",
+      "index": 3,
+      "dateAdded": 1685116351936000,
+      "lastModified": 1685116352272000,
+      "id": 5,
+      "typeCode": 2,
+      "type": "text/x-moz-place-container",
+      "root": "unfiledBookmarksFolder"
+    },
+    {
+      "guid": "mobile______",
+      "title": "mobile",
+      "index": 4,
+      "dateAdded": 1685116351968000,
+      "lastModified": 1685116352272000,
+      "id": 6,
+      "typeCode": 2,
+      "type": "text/x-moz-place-container",
+      "root": "mobileFolder"
+    }
+  ]
+}
diff --git a/browser/components/migration/tests/unit/bookmarks.invalid.html b/browser/components/migration/tests/unit/bookmarks.invalid.html
new file mode 100644
index 0000000000..900ec52e1d
--- /dev/null
+++ b/browser/components/migration/tests/unit/bookmarks.invalid.html
@@ -0,0 +1 @@
+This shouldn't cause anything to be imported.
diff --git a/browser/components/migration/tests/unit/head_migration.js b/browser/components/migration/tests/unit/head_migration.js
new file mode 100644
index 0000000000..9900f34232
--- /dev/null
+++ b/browser/components/migration/tests/unit/head_migration.js
@@ -0,0 +1,260 @@
+"use strict";
+
+var { MigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/MigrationUtils.sys.mjs"
+);
+var { LoginHelper } = ChromeUtils.importESModule(
+  "resource://gre/modules/LoginHelper.sys.mjs"
+);
+var { NetUtil } = ChromeUtils.importESModule(
+  "resource://gre/modules/NetUtil.sys.mjs"
+);
+var { PlacesUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/PlacesUtils.sys.mjs"
+);
+var { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+var { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+var { TestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TestUtils.sys.mjs"
+);
+var { PlacesTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PlacesTestUtils.sys.mjs"
+);
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+ChromeUtils.defineESModuleGetters(this, {
+  FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
+  Sqlite: "resource://gre/modules/Sqlite.sys.mjs",
+});
+
+// Initialize profile.
+var gProfD = do_get_profile();
+
+var { getAppInfo, newAppInfo, updateAppInfo } = ChromeUtils.importESModule(
+  "resource://testing-common/AppInfo.sys.mjs"
+);
+updateAppInfo();
+
+/**
+ * Migrates the requested resource and waits for the migration to be complete.
+ *
+ * @param {MigratorBase} migrator
+ *   The migrator being used to migrate the data.
+ * @param {number} resourceType
+ *   This is a bitfield with bits from nsIBrowserProfileMigrator flipped to indicate what
+ *   resources should be migrated.
+ * @param {object|string|null} [aProfile=null]
+ *   The profile to be migrated. If set to null, the default profile will be
+ *   migrated.
+ * @param {boolean} succeeds
+ *   True if this migration is expected to succeed.
+ * @returns {Promise<Array<string[]>>}
+ *   An array of the results from each nsIObserver topics being observed to
+ *   verify if the migration succeeded or failed. Those results are 2-element
+ *   arrays of [subject, data].
+ */
+async function promiseMigration(
+  migrator,
+  resourceType,
+  aProfile = null,
+  succeeds = null
+) {
+  // Ensure resource migration is available.
+  let availableSources = await migrator.getMigrateData(aProfile);
+  Assert.ok(
+    (availableSources & resourceType) > 0,
+    "Resource supported by migrator"
+  );
+  let promises = [TestUtils.topicObserved("Migration:Ended")];
+
+  if (succeeds !== null) {
+    // Check that the specific resource type succeeded
+    promises.push(
+      TestUtils.topicObserved(
+        succeeds ? "Migration:ItemAfterMigrate" : "Migration:ItemError",
+        (_, data) => data == resourceType
+      )
+    );
+  }
+
+  // Start the migration.
+  migrator.migrate(resourceType, null, aProfile);
+
+  return Promise.all(promises);
+}
+/**
+ * Function that returns a favicon url for a given page url
+ *
+ * @param {string} uri
+ * The Bookmark URI
+ * @returns {string} faviconURI
+ * The Favicon URI
+ */
+async function getFaviconForPageURI(uri) {
+  let faviconURI = await new Promise(resolve => {
+    PlacesUtils.favicons.getFaviconDataForPage(uri, favURI => {
+      resolve(favURI);
+    });
+  });
+  return faviconURI;
+}
+
+/**
+ * Takes an array of page URIs and checks that the favicon was imported for each page URI
+ *
+ * @param {Array} pageURIs An array of page URIs
+ */
+async function assertFavicons(pageURIs) {
+  for (let uri of pageURIs) {
+    let faviconURI = await getFaviconForPageURI(uri);
+    Assert.ok(faviconURI, `Got favicon for ${uri.spec}`);
+  }
+}
+
+/**
+ * Replaces a directory service entry with a given nsIFile.
+ *
+ * @param {string} key
+ *   The nsIDirectoryService directory key to register a fake path for.
+ *   For example: "AppData", "ULibDir".
+ * @param {nsIFile} file
+ *   The nsIFile to map the key to. Note that this nsIFile should represent
+ *   a directory and not an individual file.
+ * @see nsDirectoryServiceDefs.h for the list of directories that can be
+ *   overridden.
+ */
+function registerFakePath(key, file) {
+  let dirsvc = Services.dirsvc.QueryInterface(Ci.nsIProperties);
+  let originalFile;
+  try {
+    // If a file is already provided save it and undefine, otherwise set will
+    // throw for persistent entries (ones that are cached).
+    originalFile = dirsvc.get(key, Ci.nsIFile);
+    dirsvc.undefine(key);
+  } catch (e) {
+    // dirsvc.get will throw if nothing provides for the key and dirsvc.undefine
+    // will throw if it's not a persistent entry, in either case we don't want
+    // to set the original file in cleanup.
+    originalFile = undefined;
+  }
+
+  dirsvc.set(key, file);
+  registerCleanupFunction(() => {
+    dirsvc.undefine(key);
+    if (originalFile) {
+      dirsvc.set(key, originalFile);
+    }
+  });
+}
+
+function getRootPath() {
+  let dirKey;
+  if (AppConstants.platform == "win") {
+    dirKey = "LocalAppData";
+  } else if (AppConstants.platform == "macosx") {
+    dirKey = "ULibDir";
+  } else {
+    dirKey = "Home";
+  }
+  return Services.dirsvc.get(dirKey, Ci.nsIFile).path;
+}
+
+/**
+ * Returns a PRTime value for the current date minus daysAgo number
+ * of days.
+ *
+ * @param {number} daysAgo
+ *   How many days in the past from now the returned date should be.
+ * @returns {number}
+ */
+function PRTimeDaysAgo(daysAgo) {
+  return PlacesUtils.toPRTime(Date.now() - daysAgo * 24 * 60 * 60 * 1000);
+}
+
+/**
+ * Returns a Date value for the current date minus daysAgo number
+ * of days.
+ *
+ * @param {number} daysAgo
+ *   How many days in the past from now the returned date should be.
+ * @returns {Date}
+ */
+function dateDaysAgo(daysAgo) {
+  return new Date(Date.now() - daysAgo * 24 * 60 * 60 * 1000);
+}
+
+/**
+ * Constructs and returns a data structure consistent with the Chrome
+ * browsers bookmarks storage. This data structure can then be serialized
+ * to JSON and written to disk to simulate a Chrome browser's bookmarks
+ * database.
+ *
+ * @param {number} [totalBookmarks=100]
+ *   How many bookmarks to create.
+ * @returns {object}
+ */
+function createChromeBookmarkStructure(totalBookmarks = 100) {
+  let bookmarksData = {
+    roots: {
+      bookmark_bar: { children: [] },
+      other: { children: [] },
+      synced: { children: [] },
+    },
+  };
+  const MAX_BMS = totalBookmarks;
+  let barKids = bookmarksData.roots.bookmark_bar.children;
+  let menuKids = bookmarksData.roots.other.children;
+  let syncedKids = bookmarksData.roots.synced.children;
+  let currentMenuKids = menuKids;
+  let currentBarKids = barKids;
+  let currentSyncedKids = syncedKids;
+  for (let i = 0; i < MAX_BMS; i++) {
+    currentBarKids.push({
+      url: "https://www.chrome-bookmark-bar-bookmark" + i + ".com",
+      name: "bookmark " + i,
+      type: "url",
+    });
+    currentMenuKids.push({
+      url: "https://www.chrome-menu-bookmark" + i + ".com",
+      name: "bookmark for menu " + i,
+      type: "url",
+    });
+    currentSyncedKids.push({
+      url: "https://www.chrome-synced-bookmark" + i + ".com",
+      name: "bookmark for synced " + i,
+      type: "url",
+    });
+    if (i % 20 == 19) {
+      let nextFolder = {
+        name: "toolbar folder " + Math.ceil(i / 20),
+        type: "folder",
+        children: [],
+      };
+      currentBarKids.push(nextFolder);
+      currentBarKids = nextFolder.children;
+
+      nextFolder = {
+        name: "menu folder " + Math.ceil(i / 20),
+        type: "folder",
+        children: [],
+      };
+      currentMenuKids.push(nextFolder);
+      currentMenuKids = nextFolder.children;
+
+      nextFolder = {
+        name: "synced folder " + Math.ceil(i / 20),
+        type: "folder",
+        children: [],
+      };
+      currentSyncedKids.push(nextFolder);
+      currentSyncedKids = nextFolder.children;
+    }
+  }
+  return bookmarksData;
+}
diff --git a/browser/components/migration/tests/unit/insertIEHistory/InsertIEHistory.cpp b/browser/components/migration/tests/unit/insertIEHistory/InsertIEHistory.cpp
new file mode 100644
index 0000000000..dea79a9289
--- /dev/null
+++ b/browser/components/migration/tests/unit/insertIEHistory/InsertIEHistory.cpp
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * https://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Insert URLs into Internet Explorer (IE) history so we can test importing
+ * them.
+ *
+ * See API docs at
+ * https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/ms774949(v%3dvs.85)
+ */
+
+#include <urlhist.h>  // IUrlHistoryStg
+#include <shlguid.h>  // SID_SUrlHistory
+
+int main(int argc, char** argv) {
+  HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
+  if (FAILED(hr)) {
+    CoUninitialize();
+    return -1;
+  }
+  IUrlHistoryStg* ieHist;
+
+  hr =
+      ::CoCreateInstance(CLSID_CUrlHistory, nullptr, CLSCTX_INPROC_SERVER,
+                         IID_IUrlHistoryStg, reinterpret_cast<void**>(&ieHist));
+  if (FAILED(hr)) return -2;
+
+  hr = ieHist->AddUrl(L"http://www.mozilla.org/1", L"Mozilla HTTP Test", 0);
+  if (FAILED(hr)) return -3;
+
+  hr =
+      ieHist->AddUrl(L"https://www.mozilla.org/2", L"Mozilla HTTPS Test 🦊", 0);
+  if (FAILED(hr)) return -4;
+
+  CoUninitialize();
+
+  return 0;
+}
diff --git a/browser/components/migration/tests/unit/insertIEHistory/moz.build b/browser/components/migration/tests/unit/insertIEHistory/moz.build
new file mode 100644
index 0000000000..61ca96d48a
--- /dev/null
+++ b/browser/components/migration/tests/unit/insertIEHistory/moz.build
@@ -0,0 +1,19 @@
+# -*- 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/.
+
+FINAL_TARGET = "_tests/xpcshell/browser/components/migration/tests/unit"
+
+Program("InsertIEHistory")
+OS_LIBS += [
+    "ole32",
+    "uuid",
+]
+SOURCES += [
+    "InsertIEHistory.cpp",
+]
+
+NO_PGO = True
+DisableStlWrapping()
diff --git a/browser/components/migration/tests/unit/test_360seMigrationUtils.js b/browser/components/migration/tests/unit/test_360seMigrationUtils.js
new file mode 100644
index 0000000000..3a882b516d
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_360seMigrationUtils.js
@@ -0,0 +1,164 @@
+"use strict";
+
+const { Qihoo360seMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/360seMigrationUtils.sys.mjs"
+);
+
+const parentPath = do_get_file("AppData/Roaming/360se6/User Data").path;
+const loggedInPath = "0f3ab103a522f4463ecacc36d34eb996";
+const loggedInBackup = PathUtils.join(
+  parentPath,
+  "Default",
+  loggedInPath,
+  "DailyBackup",
+  "360default_ori_2021_12_02.favdb"
+);
+const loggedOutBackup = PathUtils.join(
+  parentPath,
+  "Default",
+  "DailyBackup",
+  "360default_ori_2021_12_02.favdb"
+);
+
+function getSqlitePath(profileId) {
+  return PathUtils.join(parentPath, profileId, loggedInPath, "360sefav.dat");
+}
+
+add_task(async function test_360se10_logged_in() {
+  const sqlitePath = getSqlitePath("Default");
+  await IOUtils.setModificationTime(sqlitePath);
+  await IOUtils.copy(
+    PathUtils.join(parentPath, "Default", "360Bookmarks"),
+    PathUtils.join(parentPath, "Default", loggedInPath)
+  );
+  await IOUtils.copy(loggedOutBackup, loggedInBackup);
+
+  const alternativeBookmarks =
+    await Qihoo360seMigrationUtils.getAlternativeBookmarks({
+      bookmarksPath: PathUtils.join(parentPath, "Default", "Bookmarks"),
+      localState: {
+        sync_login_info: {
+          filepath: loggedInPath,
+        },
+      },
+    });
+  Assert.ok(
+    alternativeBookmarks.resource && alternativeBookmarks.resource.exists,
+    "Should return the legacy bookmark resource."
+  );
+  Assert.strictEqual(
+    alternativeBookmarks.path,
+    undefined,
+    "Should not return any path to plain text bookmarks."
+  );
+});
+
+add_task(async function test_360se10_logged_in_outdated_sqlite() {
+  const sqlitePath = getSqlitePath("Default");
+  await IOUtils.setModificationTime(
+    sqlitePath,
+    new Date("2020-08-18").valueOf()
+  );
+
+  const alternativeBookmarks =
+    await Qihoo360seMigrationUtils.getAlternativeBookmarks({
+      bookmarksPath: PathUtils.join(parentPath, "Default", "Bookmarks"),
+      localState: {
+        sync_login_info: {
+          filepath: loggedInPath,
+        },
+      },
+    });
+  Assert.strictEqual(
+    alternativeBookmarks.resource,
+    undefined,
+    "Should not return the outdated legacy bookmark resource."
+  );
+  Assert.strictEqual(
+    alternativeBookmarks.path,
+    loggedInBackup,
+    "Should return path to the most recent plain text bookmarks backup."
+  );
+
+  await IOUtils.setModificationTime(sqlitePath);
+});
+
+add_task(async function test_360se10_logged_out() {
+  const alternativeBookmarks =
+    await Qihoo360seMigrationUtils.getAlternativeBookmarks({
+      bookmarksPath: PathUtils.join(parentPath, "Default", "Bookmarks"),
+      localState: {
+        sync_login_info: {
+          filepath: "",
+        },
+      },
+    });
+  Assert.strictEqual(
+    alternativeBookmarks.resource,
+    undefined,
+    "Should not return the legacy bookmark resource."
+  );
+  Assert.strictEqual(
+    alternativeBookmarks.path,
+    loggedOutBackup,
+    "Should return path to the most recent plain text bookmarks backup."
+  );
+});
+
+add_task(async function test_360se9_logged_in_outdated_sqlite() {
+  const sqlitePath = getSqlitePath("Default4SE9Test");
+  await IOUtils.setModificationTime(
+    sqlitePath,
+    new Date("2020-08-18").valueOf()
+  );
+
+  const alternativeBookmarks =
+    await Qihoo360seMigrationUtils.getAlternativeBookmarks({
+      bookmarksPath: PathUtils.join(parentPath, "Default4SE9Test", "Bookmarks"),
+      localState: {
+        sync_login_info: {
+          filepath: loggedInPath,
+        },
+      },
+    });
+  Assert.strictEqual(
+    alternativeBookmarks.resource,
+    undefined,
+    "Should not return the legacy bookmark resource."
+  );
+  Assert.strictEqual(
+    alternativeBookmarks.path,
+    PathUtils.join(
+      parentPath,
+      "Default4SE9Test",
+      loggedInPath,
+      "DailyBackup",
+      "360sefav_2020_08_28.favdb"
+    ),
+    "Should return path to the most recent plain text bookmarks backup."
+  );
+
+  await IOUtils.setModificationTime(sqlitePath);
+});
+
+add_task(async function test_360se9_logged_out() {
+  const alternativeBookmarks =
+    await Qihoo360seMigrationUtils.getAlternativeBookmarks({
+      bookmarksPath: PathUtils.join(parentPath, "Default4SE9Test", "Bookmarks"),
+      localState: {
+        sync_login_info: {
+          filepath: "",
+        },
+      },
+    });
+  Assert.strictEqual(
+    alternativeBookmarks.resource,
+    undefined,
+    "Should not return the legacy bookmark resource."
+  );
+  Assert.strictEqual(
+    alternativeBookmarks.path,
+    PathUtils.join(parentPath, "Default4SE9Test", "Bookmarks"),
+    "Should return path to the plain text canonical bookmarks."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_360se_bookmarks.js b/browser/components/migration/tests/unit/test_360se_bookmarks.js
new file mode 100644
index 0000000000..e4f42d1880
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_360se_bookmarks.js
@@ -0,0 +1,62 @@
+"use strict";
+
+const { CustomizableUI } = ChromeUtils.importESModule(
+  "resource:///modules/CustomizableUI.sys.mjs"
+);
+
+add_task(async function () {
+  registerFakePath("AppData", do_get_file("AppData/Roaming/"));
+
+  let migrator = await MigrationUtils.getMigrator("chromium-360se");
+  // Sanity check for the source.
+  Assert.ok(await migrator.isSourceAvailable());
+
+  let importedToBookmarksToolbar = false;
+  let itemsSeen = { bookmarks: 0, folders: 0 };
+
+  let listener = events => {
+    for (let event of events) {
+      itemsSeen[
+        event.itemType == PlacesUtils.bookmarks.TYPE_FOLDER
+          ? "folders"
+          : "bookmarks"
+      ]++;
+      if (event.parentGuid == PlacesUtils.bookmarks.toolbarGuid) {
+        importedToBookmarksToolbar = true;
+      }
+    }
+  };
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+  let observerNotified = false;
+  Services.obs.addObserver((aSubject, aTopic, aData) => {
+    let [toolbar, visibility] = JSON.parse(aData);
+    Assert.equal(
+      toolbar,
+      CustomizableUI.AREA_BOOKMARKS,
+      "Notification should be received for bookmarks toolbar"
+    );
+    Assert.equal(
+      visibility,
+      "true",
+      "Notification should say to reveal the bookmarks toolbar"
+    );
+    observerNotified = true;
+  }, "browser-set-toolbar-visibility");
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.BOOKMARKS, {
+    id: "Default",
+  });
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+
+  // Check the bookmarks have been imported to all the expected parents.
+  Assert.ok(importedToBookmarksToolbar, "Bookmarks imported in the toolbar");
+  Assert.equal(itemsSeen.bookmarks, 8, "Should import all bookmarks.");
+  Assert.equal(itemsSeen.folders, 2, "Should import all folders.");
+  // Check that the telemetry matches:
+  Assert.equal(
+    MigrationUtils._importQuantities.bookmarks,
+    itemsSeen.bookmarks + itemsSeen.folders,
+    "Telemetry reporting correct."
+  );
+  Assert.ok(observerNotified, "The observer should be notified upon migration");
+});
diff --git a/browser/components/migration/tests/unit/test_BookmarksFileMigrator.js b/browser/components/migration/tests/unit/test_BookmarksFileMigrator.js
new file mode 100644
index 0000000000..ec10097e76
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_BookmarksFileMigrator.js
@@ -0,0 +1,134 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { BookmarksFileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/FileMigrators.sys.mjs"
+);
+
+const { MigrationWizardConstants } = ChromeUtils.importESModule(
+  "chrome://browser/content/migration/migration-wizard-constants.mjs"
+);
+
+/**
+ * Tests that the BookmarksFileMigrator properly subclasses FileMigratorBase
+ * and delegates to BookmarkHTMLUtils or BookmarkJSONUtils.
+ *
+ * Normally, we'd override the BookmarkHTMLUtils and BookmarkJSONUtils methods
+ * in our test here so that we just ensure that they're called with the
+ * right arguments, rather than testing their behaviour. Unfortunately, both
+ * BookmarkHTMLUtils and BookmarkJSONUtils are frozen with Object.freeze, which
+ * prevents sinon from stubbing out any of their methods. Rather than unfreezing
+ * those objects just for testing, we test the whole flow end-to-end, including
+ * the import to Places.
+ */
+
+add_setup(() => {
+  Services.prefs.setBoolPref("browser.migrate.bookmarks-file.enabled", true);
+  registerCleanupFunction(async () => {
+    await PlacesUtils.bookmarks.eraseEverything();
+    Services.prefs.clearUserPref("browser.migrate.bookmarks-file.enabled");
+  });
+});
+
+/**
+ * First check that the BookmarksFileMigrator implements the required parts
+ * of the parent class.
+ */
+add_task(async function test_BookmarksFileMigrator_members() {
+  let migrator = new BookmarksFileMigrator();
+  Assert.ok(
+    migrator.constructor.key,
+    `BookmarksFileMigrator implements static getter 'key'`
+  );
+
+  Assert.ok(
+    migrator.constructor.displayNameL10nID,
+    `BookmarksFileMigrator implements static getter 'displayNameL10nID'`
+  );
+
+  Assert.ok(
+    migrator.constructor.brandImage,
+    `BookmarksFileMigrator implements static getter 'brandImage'`
+  );
+
+  Assert.ok(
+    migrator.progressHeaderL10nID,
+    `BookmarksFileMigrator implements getter 'progressHeaderL10nID'`
+  );
+
+  Assert.ok(
+    migrator.successHeaderL10nID,
+    `BookmarksFileMigrator implements getter 'successHeaderL10nID'`
+  );
+
+  Assert.ok(
+    await migrator.getFilePickerConfig(),
+    `BookmarksFileMigrator implements method 'getFilePickerConfig'`
+  );
+
+  Assert.ok(
+    migrator.displayedResourceTypes,
+    `BookmarksFileMigrator implements getter 'displayedResourceTypes'`
+  );
+
+  Assert.ok(migrator.enabled, `BookmarksFileMigrator is enabled`);
+});
+
+add_task(async function test_BookmarksFileMigrator_HTML() {
+  let migrator = new BookmarksFileMigrator();
+  const EXPECTED_SUCCESS_STATE = {
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES
+      .BOOKMARKS_FROM_FILE]: "8 bookmarks",
+  };
+
+  const BOOKMARKS_PATH = PathUtils.join(
+    do_get_cwd().path,
+    "bookmarks.exported.html"
+  );
+
+  let result = await migrator.migrate(BOOKMARKS_PATH);
+
+  Assert.deepEqual(
+    result,
+    EXPECTED_SUCCESS_STATE,
+    "Returned the expected success state."
+  );
+});
+
+add_task(async function test_BookmarksFileMigrator_JSON() {
+  let migrator = new BookmarksFileMigrator();
+
+  const EXPECTED_SUCCESS_STATE = {
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES
+      .BOOKMARKS_FROM_FILE]: "10 bookmarks",
+  };
+
+  const BOOKMARKS_PATH = PathUtils.join(
+    do_get_cwd().path,
+    "bookmarks.exported.json"
+  );
+
+  let result = await migrator.migrate(BOOKMARKS_PATH);
+
+  Assert.deepEqual(
+    result,
+    EXPECTED_SUCCESS_STATE,
+    "Returned the expected success state."
+  );
+});
+
+add_task(async function test_BookmarksFileMigrator_invalid() {
+  let migrator = new BookmarksFileMigrator();
+
+  const INVALID_FILE_PATH = PathUtils.join(
+    do_get_cwd().path,
+    "bookmarks.invalid.html"
+  );
+
+  await Assert.rejects(
+    migrator.migrate(INVALID_FILE_PATH),
+    /Pick another file/
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_ChromeMigrationUtils.js b/browser/components/migration/tests/unit/test_ChromeMigrationUtils.js
new file mode 100644
index 0000000000..32a8d1b4bc
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_ChromeMigrationUtils.js
@@ -0,0 +1,87 @@
+"use strict";
+
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+
+// Setup chrome user data path for all platforms.
+ChromeMigrationUtils.getDataPath = () => {
+  return Promise.resolve(
+    do_get_file("Library/Application Support/Google/Chrome/").path
+  );
+};
+
+add_task(async function test_getExtensionList_function() {
+  let extensionList = await ChromeMigrationUtils.getExtensionList("Default");
+  Assert.equal(
+    extensionList.length,
+    2,
+    "There should be 2 extensions installed."
+  );
+  Assert.deepEqual(
+    extensionList.find(extension => extension.id == "fake-extension-1"),
+    {
+      id: "fake-extension-1",
+      name: "Fake Extension 1",
+      description: "It is the description of fake extension 1.",
+    },
+    "First extension should match expectations."
+  );
+  Assert.deepEqual(
+    extensionList.find(extension => extension.id == "fake-extension-2"),
+    {
+      id: "fake-extension-2",
+      name: "Fake Extension 2",
+      // There is no description in the `manifest.json` file of this extension.
+      description: null,
+    },
+    "Second extension should match expectations."
+  );
+});
+
+add_task(async function test_getExtensionInformation_function() {
+  let extension = await ChromeMigrationUtils.getExtensionInformation(
+    "fake-extension-1",
+    "Default"
+  );
+  Assert.deepEqual(
+    extension,
+    {
+      id: "fake-extension-1",
+      name: "Fake Extension 1",
+      description: "It is the description of fake extension 1.",
+    },
+    "Should get the extension information correctly."
+  );
+});
+
+add_task(async function test_getLocaleString_function() {
+  let name = await ChromeMigrationUtils._getLocaleString(
+    "__MSG_name__",
+    "en_US",
+    "fake-extension-1",
+    "Default"
+  );
+  Assert.deepEqual(
+    name,
+    "Fake Extension 1",
+    "The value of __MSG_name__ locale key is Fake Extension 1."
+  );
+});
+
+add_task(async function test_isExtensionInstalled_function() {
+  let isInstalled = await ChromeMigrationUtils.isExtensionInstalled(
+    "fake-extension-1",
+    "Default"
+  );
+  Assert.ok(isInstalled, "The fake-extension-1 extension should be installed.");
+});
+
+add_task(async function test_getLastUsedProfileId_function() {
+  let profileId = await ChromeMigrationUtils.getLastUsedProfileId();
+  Assert.equal(
+    profileId,
+    "Default",
+    "The last used profile ID should be Default."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path.js b/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path.js
new file mode 100644
index 0000000000..ca75595ea9
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path.js
@@ -0,0 +1,141 @@
+"use strict";
+
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+
+const SUB_DIRECTORIES = {
+  win: {
+    Chrome: ["Google", "Chrome", "User Data"],
+    Chromium: ["Chromium", "User Data"],
+    Canary: ["Google", "Chrome SxS", "User Data"],
+  },
+  macosx: {
+    Chrome: ["Application Support", "Google", "Chrome"],
+    Chromium: ["Application Support", "Chromium"],
+    Canary: ["Application Support", "Google", "Chrome Canary"],
+  },
+  linux: {
+    Chrome: [".config", "google-chrome"],
+    Chromium: [".config", "chromium"],
+    Canary: [],
+  },
+};
+
+add_task(async function setup_fakePaths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+
+  registerFakePath(pathId, do_get_file("chromefiles/", true));
+});
+
+add_task(async function test_getDataPath_function() {
+  let projects = ["Chrome", "Chromium", "Canary"];
+  let rootPath = getRootPath();
+
+  for (let project of projects) {
+    let subfolders = SUB_DIRECTORIES[AppConstants.platform][project];
+
+    await IOUtils.makeDirectory(PathUtils.join(rootPath, ...subfolders), {
+      createAncestor: true,
+      ignoreExisting: true,
+    });
+  }
+
+  let chromeUserDataPath = await ChromeMigrationUtils.getDataPath("Chrome");
+  let chromiumUserDataPath = await ChromeMigrationUtils.getDataPath("Chromium");
+  let canaryUserDataPath = await ChromeMigrationUtils.getDataPath("Canary");
+  if (AppConstants.platform == "win") {
+    Assert.equal(
+      chromeUserDataPath,
+      PathUtils.join(getRootPath(), "Google", "Chrome", "User Data"),
+      "Should get the path of Chrome data directory."
+    );
+    Assert.equal(
+      chromiumUserDataPath,
+      PathUtils.join(getRootPath(), "Chromium", "User Data"),
+      "Should get the path of Chromium data directory."
+    );
+    Assert.equal(
+      canaryUserDataPath,
+      PathUtils.join(getRootPath(), "Google", "Chrome SxS", "User Data"),
+      "Should get the path of Canary data directory."
+    );
+  } else if (AppConstants.platform == "macosx") {
+    Assert.equal(
+      chromeUserDataPath,
+      PathUtils.join(getRootPath(), "Application Support", "Google", "Chrome"),
+      "Should get the path of Chrome data directory."
+    );
+    Assert.equal(
+      chromiumUserDataPath,
+      PathUtils.join(getRootPath(), "Application Support", "Chromium"),
+      "Should get the path of Chromium data directory."
+    );
+    Assert.equal(
+      canaryUserDataPath,
+      PathUtils.join(
+        getRootPath(),
+        "Application Support",
+        "Google",
+        "Chrome Canary"
+      ),
+      "Should get the path of Canary data directory."
+    );
+  } else {
+    Assert.equal(
+      chromeUserDataPath,
+      PathUtils.join(getRootPath(), ".config", "google-chrome"),
+      "Should get the path of Chrome data directory."
+    );
+    Assert.equal(
+      chromiumUserDataPath,
+      PathUtils.join(getRootPath(), ".config", "chromium"),
+      "Should get the path of Chromium data directory."
+    );
+    Assert.equal(canaryUserDataPath, null, "Should get null for Canary.");
+  }
+});
+
+add_task(async function test_getExtensionPath_function() {
+  let extensionPath = await ChromeMigrationUtils.getExtensionPath("Default");
+  let expectedPath;
+  if (AppConstants.platform == "win") {
+    expectedPath = PathUtils.join(
+      getRootPath(),
+      "Google",
+      "Chrome",
+      "User Data",
+      "Default",
+      "Extensions"
+    );
+  } else if (AppConstants.platform == "macosx") {
+    expectedPath = PathUtils.join(
+      getRootPath(),
+      "Application Support",
+      "Google",
+      "Chrome",
+      "Default",
+      "Extensions"
+    );
+  } else {
+    expectedPath = PathUtils.join(
+      getRootPath(),
+      ".config",
+      "google-chrome",
+      "Default",
+      "Extensions"
+    );
+  }
+  Assert.equal(
+    extensionPath,
+    expectedPath,
+    "Should get the path of extensions directory."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path_chromium_snap.js b/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path_chromium_snap.js
new file mode 100644
index 0000000000..5011991536
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_ChromeMigrationUtils_path_chromium_snap.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+
+const SUB_DIRECTORIES = {
+  linux: {
+    Chromium: [".config", "chromium"],
+    SnapChromium: ["snap", "chromium", "common", "chromium"],
+  },
+};
+
+add_task(async function setup_fakePaths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+
+  registerFakePath(pathId, do_get_file("chromefiles/", true));
+});
+
+add_task(async function test_getDataPath_function() {
+  let rootPath = getRootPath();
+  let chromiumSubFolders = SUB_DIRECTORIES[AppConstants.platform].Chromium;
+  // must remove normal chromium path
+  await IOUtils.remove(PathUtils.join(rootPath, ...chromiumSubFolders), {
+    ignoreAbsent: true,
+  });
+
+  let snapChromiumSubFolders =
+    SUB_DIRECTORIES[AppConstants.platform].SnapChromium;
+  // must create snap chromium path
+  await IOUtils.makeDirectory(
+    PathUtils.join(rootPath, ...snapChromiumSubFolders),
+    {
+      createAncestor: true,
+      ignoreExisting: true,
+    }
+  );
+
+  let chromiumUserDataPath = await ChromeMigrationUtils.getDataPath("Chromium");
+  Assert.equal(
+    chromiumUserDataPath,
+    PathUtils.join(getRootPath(), ...snapChromiumSubFolders),
+    "Should get the path of Snap Chromium data directory."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_bookmarks.js b/browser/components/migration/tests/unit/test_Chrome_bookmarks.js
new file mode 100644
index 0000000000..d115cda412
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_bookmarks.js
@@ -0,0 +1,205 @@
+"use strict";
+
+const { CustomizableUI } = ChromeUtils.importESModule(
+  "resource:///modules/CustomizableUI.sys.mjs"
+);
+
+const { PlacesUIUtils } = ChromeUtils.importESModule(
+  "resource:///modules/PlacesUIUtils.sys.mjs"
+);
+
+let rootDir = do_get_file("chromefiles/", true);
+
+add_task(async function setup_fakePaths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+  registerFakePath(pathId, rootDir);
+});
+
+add_task(async function setup_initialBookmarks() {
+  let bookmarks = [];
+  for (let i = 0; i < PlacesUIUtils.NUM_TOOLBAR_BOOKMARKS_TO_UNHIDE + 1; i++) {
+    bookmarks.push({ url: "https://example.com/" + i, title: "" + i });
+  }
+
+  // Ensure we have enough items in both the menu and toolbar to trip creating a "from" folder.
+  await PlacesUtils.bookmarks.insertTree({
+    guid: PlacesUtils.bookmarks.toolbarGuid,
+    children: bookmarks,
+  });
+  await PlacesUtils.bookmarks.insertTree({
+    guid: PlacesUtils.bookmarks.menuGuid,
+    children: bookmarks,
+  });
+});
+
+async function testBookmarks(migratorKey, subDirs) {
+  if (AppConstants.platform == "macosx") {
+    subDirs.unshift("Application Support");
+  } else if (AppConstants.platform == "win") {
+    subDirs.push("User Data");
+  } else {
+    subDirs.unshift(".config");
+  }
+
+  let target = rootDir.clone();
+
+  // Pretend this is the default profile
+  while (subDirs.length) {
+    target.append(subDirs.shift());
+  }
+
+  let localStatePath = PathUtils.join(target.path, "Local State");
+  await IOUtils.writeJSON(localStatePath, []);
+
+  target.append("Default");
+
+  await IOUtils.makeDirectory(target.path, {
+    createAncestor: true,
+    ignoreExisting: true,
+  });
+
+  // Copy Favicons database into Default profile
+  const sourcePath = do_get_file(
+    "AppData/Local/Google/Chrome/User Data/Default/Favicons"
+  ).path;
+  await IOUtils.copy(sourcePath, target.path);
+
+  // Get page url for each favicon
+  let faviconURIs = await MigrationUtils.getRowsFromDBWithoutLocks(
+    sourcePath,
+    "Chrome Bookmark Favicons",
+    `select page_url from icon_mapping`
+  );
+
+  target.append("Bookmarks");
+  await IOUtils.remove(target.path, { ignoreAbsent: true });
+
+  let bookmarksData = createChromeBookmarkStructure();
+  await IOUtils.writeJSON(target.path, bookmarksData);
+
+  let migrator = await MigrationUtils.getMigrator(migratorKey);
+  Assert.ok(await migrator.hasPermissions(), "Has permissions");
+  // Sanity check for the source.
+  Assert.ok(await migrator.isSourceAvailable());
+
+  let itemsSeen = { bookmarks: 0, folders: 0 };
+  let listener = events => {
+    for (let event of events) {
+      itemsSeen[
+        event.itemType == PlacesUtils.bookmarks.TYPE_FOLDER
+          ? "folders"
+          : "bookmarks"
+      ]++;
+    }
+  };
+
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+  const PROFILE = {
+    id: "Default",
+    name: "Default",
+  };
+  let observerNotified = false;
+  Services.obs.addObserver((aSubject, aTopic, aData) => {
+    let [toolbar, visibility] = JSON.parse(aData);
+    Assert.equal(
+      toolbar,
+      CustomizableUI.AREA_BOOKMARKS,
+      "Notification should be received for bookmarks toolbar"
+    );
+    Assert.equal(
+      visibility,
+      "true",
+      "Notification should say to reveal the bookmarks toolbar"
+    );
+    observerNotified = true;
+  }, "browser-set-toolbar-visibility");
+  const initialToolbarCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.toolbarGuid
+  );
+  const initialUnfiledCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.unfiledGuid
+  );
+  const initialmenuCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.menuGuid
+  );
+
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.BOOKMARKS,
+    PROFILE
+  );
+  const postToolbarCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.toolbarGuid
+  );
+  const postUnfiledCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.unfiledGuid
+  );
+  const postmenuCount = await getFolderItemCount(
+    PlacesUtils.bookmarks.menuGuid
+  );
+
+  Assert.equal(
+    postUnfiledCount - initialUnfiledCount,
+    210,
+    "Should have seen 210 items in unsorted bookmarks"
+  );
+  Assert.equal(
+    postToolbarCount - initialToolbarCount,
+    105,
+    "Should have seen 105 items in toolbar"
+  );
+  Assert.equal(
+    postmenuCount - initialmenuCount,
+    0,
+    "Should have seen 0 items in menu toolbar"
+  );
+
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+
+  Assert.equal(itemsSeen.bookmarks, 300, "Should have seen 300 bookmarks.");
+  Assert.equal(itemsSeen.folders, 15, "Should have seen 15 folders.");
+  Assert.equal(
+    MigrationUtils._importQuantities.bookmarks,
+    itemsSeen.bookmarks + itemsSeen.folders,
+    "Telemetry reporting correct."
+  );
+  Assert.ok(observerNotified, "The observer should be notified upon migration");
+  let pageUrls = Array.from(faviconURIs, f =>
+    Services.io.newURI(f.getResultByName("page_url"))
+  );
+  await assertFavicons(pageUrls);
+}
+
+add_task(async function test_Chrome() {
+  // Expire all favicons before the test to make sure favicons are imported
+  PlacesUtils.favicons.expireAllFavicons();
+  let subDirs =
+    AppConstants.platform == "linux" ? ["google-chrome"] : ["Google", "Chrome"];
+  await testBookmarks("chrome", subDirs);
+});
+
+add_task(async function test_ChromiumEdge() {
+  PlacesUtils.favicons.expireAllFavicons();
+  if (AppConstants.platform == "linux") {
+    // Edge isn't available on Linux.
+    return;
+  }
+  let subDirs =
+    AppConstants.platform == "macosx"
+      ? ["Microsoft Edge"]
+      : ["Microsoft", "Edge"];
+  await testBookmarks("chromium-edge", subDirs);
+});
+
+async function getFolderItemCount(guid) {
+  let results = await PlacesUtils.promiseBookmarksTree(guid);
+
+  return results.itemsCount;
+}
diff --git a/browser/components/migration/tests/unit/test_Chrome_corrupt_history.js b/browser/components/migration/tests/unit/test_Chrome_corrupt_history.js
new file mode 100644
index 0000000000..31541f9fdb
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_corrupt_history.js
@@ -0,0 +1,83 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+let rootDir = do_get_file("chromefiles/", true);
+
+const SOURCE_PROFILE_DIR = "Library/Application Support/Google/Chrome/Default/";
+const PROFILE = {
+  id: "Default",
+  name: "Person 1",
+};
+
+add_setup(async function setup_fake_paths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+  registerFakePath(pathId, rootDir);
+
+  let file = do_get_file(`${SOURCE_PROFILE_DIR}HistoryCorrupt`);
+  file.copyTo(file.parent, "History");
+
+  registerCleanupFunction(() => {
+    let historyFile = do_get_file(`${SOURCE_PROFILE_DIR}History`, true);
+    try {
+      historyFile.remove(false);
+    } catch (ex) {
+      // It is ok if this doesn't exist.
+      if (ex.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw ex;
+      }
+    }
+  });
+
+  let subDirs =
+    AppConstants.platform == "linux" ? ["google-chrome"] : ["Google", "Chrome"];
+
+  if (AppConstants.platform == "macosx") {
+    subDirs.unshift("Application Support");
+  } else if (AppConstants.platform == "win") {
+    subDirs.push("User Data");
+  } else {
+    subDirs.unshift(".config");
+  }
+
+  let target = rootDir.clone();
+  // Pretend this is the default profile
+  subDirs.push("Default");
+  while (subDirs.length) {
+    target.append(subDirs.shift());
+  }
+
+  await IOUtils.makeDirectory(target.path, {
+    createAncestor: true,
+    ignoreExisting: true,
+  });
+
+  target.append("Bookmarks");
+  await IOUtils.remove(target.path, { ignoreAbsent: true });
+
+  let bookmarksData = createChromeBookmarkStructure();
+  await IOUtils.writeJSON(target.path, bookmarksData);
+});
+
+add_task(async function test_corrupt_history() {
+  let migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(await migrator.isSourceAvailable());
+
+  let data = await migrator.getMigrateData(PROFILE);
+  Assert.ok(
+    data & MigrationUtils.resourceTypes.BOOKMARKS,
+    "Bookmarks resource available."
+  );
+  Assert.ok(
+    !(data & MigrationUtils.resourceTypes.HISTORY),
+    "Corrupt history resource unavailable."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_credit_cards.js b/browser/components/migration/tests/unit/test_Chrome_credit_cards.js
new file mode 100644
index 0000000000..5c4d3517d2
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_credit_cards.js
@@ -0,0 +1,239 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* global structuredClone */
+
+const PROFILE = {
+  id: "Default",
+  name: "Default",
+};
+
+const PAYMENT_METHODS = [
+  {
+    name_on_card: "Name Name",
+    card_number: "4532962432748929", // Visa
+    expiration_month: 3,
+    expiration_year: 2027,
+  },
+  {
+    name_on_card: "Name Name Name",
+    card_number: "5359908373796416", // Mastercard
+    expiration_month: 5,
+    expiration_year: 2028,
+  },
+  {
+    name_on_card: "Name",
+    card_number: "346624461807588", // AMEX
+    expiration_month: 4,
+    expiration_year: 2026,
+  },
+];
+
+let OSKeyStoreTestUtils;
+add_setup(async function os_key_store_setup() {
+  ({ OSKeyStoreTestUtils } = ChromeUtils.importESModule(
+    "resource://testing-common/OSKeyStoreTestUtils.sys.mjs"
+  ));
+  OSKeyStoreTestUtils.setup();
+  registerCleanupFunction(async function cleanup() {
+    await OSKeyStoreTestUtils.cleanup();
+  });
+});
+
+let rootDir = do_get_file("chromefiles/", true);
+
+function checkCardsAreEqual(importedCard, testCard, id) {
+  const CC_NUMBER_RE = /^(\*+)(.{4})$/;
+
+  Assert.equal(
+    importedCard["cc-name"],
+    testCard.name_on_card,
+    "The two logins ID " + id + " have the same name on card"
+  );
+
+  let matches = CC_NUMBER_RE.exec(importedCard["cc-number"]);
+  Assert.notEqual(matches, null);
+  Assert.equal(importedCard["cc-number"].length, testCard.card_number.length);
+  Assert.equal(testCard.card_number.endsWith(matches[2]), true);
+  Assert.notEqual(importedCard["cc-number-encrypted"], "");
+
+  Assert.equal(
+    importedCard["cc-exp-month"],
+    testCard.expiration_month,
+    "The two logins ID " + id + " have the same expiration month"
+  );
+  Assert.equal(
+    importedCard["cc-exp-year"],
+    testCard.expiration_year,
+    "The two logins ID " + id + " have the same expiration year"
+  );
+}
+
+add_task(async function setup_fakePaths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+  registerFakePath(pathId, rootDir);
+});
+
+add_task(async function test_credit_cards() {
+  if (!OSKeyStoreTestUtils.canTestOSKeyStoreLogin()) {
+    todo_check_true(
+      OSKeyStoreTestUtils.canTestOSKeyStoreLogin(),
+      "Cannot test OS key store login on official builds."
+    );
+    return;
+  }
+
+  let loginCrypto;
+  let profilePathSegments;
+
+  let mockMacOSKeychain = {
+    passphrase: "bW96aWxsYWZpcmVmb3g=",
+    serviceName: "TESTING Chrome Safe Storage",
+    accountName: "TESTING Chrome",
+  };
+  if (AppConstants.platform == "macosx") {
+    let { ChromeMacOSLoginCrypto } = ChromeUtils.importESModule(
+      "resource:///modules/ChromeMacOSLoginCrypto.sys.mjs"
+    );
+    loginCrypto = new ChromeMacOSLoginCrypto(
+      mockMacOSKeychain.serviceName,
+      mockMacOSKeychain.accountName,
+      mockMacOSKeychain.passphrase
+    );
+    profilePathSegments = [
+      "Application Support",
+      "Google",
+      "Chrome",
+      "Default",
+    ];
+  } else if (AppConstants.platform == "win") {
+    let { ChromeWindowsLoginCrypto } = ChromeUtils.importESModule(
+      "resource:///modules/ChromeWindowsLoginCrypto.sys.mjs"
+    );
+    loginCrypto = new ChromeWindowsLoginCrypto("Chrome");
+    profilePathSegments = ["Google", "Chrome", "User Data", "Default"];
+  } else {
+    throw new Error("Not implemented");
+  }
+
+  let target = rootDir.clone();
+  let defaultFolderPath = PathUtils.join(target.path, ...profilePathSegments);
+  let webDataPath = PathUtils.join(defaultFolderPath, "Web Data");
+  let localStatePath = defaultFolderPath.replace("Default", "");
+
+  await IOUtils.makeDirectory(defaultFolderPath, {
+    createAncestor: true,
+    ignoreExisting: true,
+  });
+
+  // Copy Web Data database into Default profile
+  const sourcePathWebData = do_get_file(
+    "AppData/Local/Google/Chrome/User Data/Default/Web Data"
+  ).path;
+  await IOUtils.copy(sourcePathWebData, webDataPath);
+
+  const sourcePathLocalState = do_get_file(
+    "AppData/Local/Google/Chrome/User Data/Local State"
+  ).path;
+  await IOUtils.copy(sourcePathLocalState, localStatePath);
+
+  let dbConn = await Sqlite.openConnection({ path: webDataPath });
+
+  for (let card of PAYMENT_METHODS) {
+    let encryptedCardNumber = await loginCrypto.encryptData(card.card_number);
+    let cardNumberEncryptedValue = new Uint8Array(
+      loginCrypto.stringToArray(encryptedCardNumber)
+    );
+
+    let cardCopy = structuredClone(card);
+
+    cardCopy.card_number_encrypted = cardNumberEncryptedValue;
+    delete cardCopy.card_number;
+
+    await dbConn.execute(
+      `INSERT INTO credit_cards
+                           (name_on_card, card_number_encrypted, expiration_month, expiration_year)
+                           VALUES (:name_on_card, :card_number_encrypted, :expiration_month, :expiration_year)
+                          `,
+      cardCopy
+    );
+  }
+
+  await dbConn.close();
+
+  let migrator = await MigrationUtils.getMigrator("chrome");
+  if (AppConstants.platform == "macosx") {
+    Object.assign(migrator, {
+      _keychainServiceName: mockMacOSKeychain.serviceName,
+      _keychainAccountName: mockMacOSKeychain.accountName,
+      _keychainMockPassphrase: mockMacOSKeychain.passphrase,
+    });
+  }
+  Assert.ok(
+    await migrator.isSourceAvailable(),
+    "Sanity check the source exists"
+  );
+
+  Services.prefs.setBoolPref(
+    "browser.migrate.chrome.payment_methods.enabled",
+    false
+  );
+  Assert.ok(
+    !(
+      (await migrator.getMigrateData(PROFILE)) &
+      MigrationUtils.resourceTypes.PAYMENT_METHODS
+    ),
+    "Should be able to disable migrating payment methods"
+  );
+  // Clear the cached resources now so that a re-check for payment methods
+  // will look again.
+  delete migrator._resourcesByProfile[PROFILE.id];
+
+  Services.prefs.setBoolPref(
+    "browser.migrate.chrome.payment_methods.enabled",
+    true
+  );
+
+  Assert.ok(
+    (await migrator.getMigrateData(PROFILE)) &
+      MigrationUtils.resourceTypes.PAYMENT_METHODS,
+    "Should be able to enable migrating payment methods"
+  );
+
+  let { formAutofillStorage } = ChromeUtils.importESModule(
+    "resource://autofill/FormAutofillStorage.sys.mjs"
+  );
+  await formAutofillStorage.initialize();
+
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.PAYMENT_METHODS,
+    PROFILE
+  );
+
+  let cards = await formAutofillStorage.creditCards.getAll();
+
+  Assert.equal(
+    cards.length,
+    PAYMENT_METHODS.length,
+    "Check there are still the same number of credit cards after re-importing the data"
+  );
+  Assert.equal(
+    cards.length,
+    MigrationUtils._importQuantities.cards,
+    "Check telemetry matches the actual import."
+  );
+
+  for (let i = 0; i < PAYMENT_METHODS.length; i++) {
+    checkCardsAreEqual(cards[i], PAYMENT_METHODS[i], i + 1);
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_extensions.js b/browser/components/migration/tests/unit/test_Chrome_extensions.js
new file mode 100644
index 0000000000..7aa7a94194
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_extensions.js
@@ -0,0 +1,165 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { AMBrowserExtensionsImport, AddonManager } = ChromeUtils.importESModule(
+  "resource://gre/modules/AddonManager.sys.mjs"
+);
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+const { ChromeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeProfileMigrator.sys.mjs"
+);
+
+AddonTestUtils.init(this);
+AddonTestUtils.overrideCertDB();
+AddonTestUtils.createAppInfo(
+  "xpcshell@tests.mozilla.org",
+  "XPCShell",
+  "42",
+  "42"
+);
+
+const TEST_SERVER = AddonTestUtils.createHttpServer({ hosts: ["example.com"] });
+
+const PROFILE = {
+  id: "Default",
+  name: "Person 1",
+};
+
+const IMPORTED_ADDON_1 = {
+  name: "A Firefox extension",
+  version: "1.0",
+  browser_specific_settings: { gecko: { id: "some-ff@extension" } },
+};
+
+// Setup chrome user data path for all platforms.
+ChromeMigrationUtils.getDataPath = () => {
+  return Promise.resolve(
+    do_get_file("Library/Application Support/Google/Chrome/").path
+  );
+};
+
+const mockAddonRepository = ({ addons = [] } = {}) => {
+  return {
+    async getMappedAddons(browserID, extensionIDs) {
+      Assert.equal(browserID, "chrome", "expected browser ID");
+      // Sort extension IDs to have a predictable order.
+      extensionIDs.sort();
+      Assert.deepEqual(
+        extensionIDs,
+        ["fake-extension-1", "fake-extension-2"],
+        "expected an array of 2 extension IDs"
+      );
+      return Promise.resolve({
+        addons,
+        matchedIDs: [],
+        unmatchedIDs: [],
+      });
+    },
+  };
+};
+
+add_setup(async function setup() {
+  await AddonTestUtils.promiseStartupManager();
+
+  // Create a Firefox XPI that we can use during the import.
+  const xpi = AddonTestUtils.createTempWebExtensionFile({
+    manifest: IMPORTED_ADDON_1,
+  });
+  TEST_SERVER.registerFile(`/addons/addon-1.xpi`, xpi);
+
+  // Override the `AddonRepository` in `AMBrowserExtensionsImport` with our own
+  // mock so that we control the add-ons that are mapped to the list of Chrome
+  // extension IDs.
+  const addons = [
+    {
+      id: IMPORTED_ADDON_1.browser_specific_settings.gecko.id,
+      name: IMPORTED_ADDON_1.name,
+      version: IMPORTED_ADDON_1.version,
+      sourceURI: Services.io.newURI(`http://example.com/addons/addon-1.xpi`),
+      icons: {},
+    },
+  ];
+  AMBrowserExtensionsImport._addonRepository = mockAddonRepository({ addons });
+
+  registerCleanupFunction(() => {
+    // Clear the add-on repository override.
+    AMBrowserExtensionsImport._addonRepository = null;
+  });
+});
+
+add_task(
+  { pref_set: [["browser.migrate.chrome.extensions.enabled", true]] },
+  async function test_import_extensions() {
+    const migrator = await MigrationUtils.getMigrator("chrome");
+    Assert.ok(
+      await migrator.isSourceAvailable(),
+      "Sanity check the source exists"
+    );
+
+    let promiseTopic = TestUtils.topicObserved(
+      "webextension-imported-addons-pending"
+    );
+    await promiseMigration(
+      migrator,
+      MigrationUtils.resourceTypes.EXTENSIONS,
+      PROFILE,
+      true
+    );
+    await promiseTopic;
+    // When this property is `true`, the UI should show a badge on the appmenu
+    // button, and the user can finalize the import later.
+    Assert.ok(
+      AMBrowserExtensionsImport.canCompleteOrCancelInstalls,
+      "expected some add-ons to have been imported"
+    );
+
+    // Let's actually complete the import programatically below.
+    promiseTopic = TestUtils.topicObserved(
+      "webextension-imported-addons-complete"
+    );
+    await AMBrowserExtensionsImport.completeInstalls();
+    await Promise.all([
+      AddonTestUtils.promiseInstallEvent("onInstallEnded"),
+      promiseTopic,
+    ]);
+
+    // The add-on should be installed and therefore it can be uninstalled.
+    const addon = await AddonManager.getAddonByID(
+      IMPORTED_ADDON_1.browser_specific_settings.gecko.id
+    );
+    await addon.uninstall();
+  }
+);
+
+/**
+ * Test that, for now at least, the extension resource type is only made
+ * available for Chrome and none of the derivitive browsers.
+ */
+add_task(
+  { pref_set: [["browser.migrate.chrome.extensions.enabled", true]] },
+  async function test_only_chrome_migrates_extensions() {
+    for (const key of MigrationUtils.availableMigratorKeys) {
+      let migrator = await MigrationUtils.getMigrator(key);
+
+      if (migrator instanceof ChromeProfileMigrator && key != "chrome") {
+        info("Testing migrator with key " + key);
+        Assert.ok(
+          await migrator.isSourceAvailable(),
+          "First check the source exists"
+        );
+        let resourceTypes = await migrator.getMigrateData(PROFILE);
+        Assert.ok(
+          !(resourceTypes & MigrationUtils.resourceTypes.EXTENSIONS),
+          "Should not offer the extension resource type"
+        );
+      }
+    }
+  }
+);
diff --git a/browser/components/migration/tests/unit/test_Chrome_formdata.js b/browser/components/migration/tests/unit/test_Chrome_formdata.js
new file mode 100644
index 0000000000..1dc411cb14
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_formdata.js
@@ -0,0 +1,118 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { FormHistory } = ChromeUtils.importESModule(
+  "resource://gre/modules/FormHistory.sys.mjs"
+);
+
+let rootDir = do_get_file("chromefiles/", true);
+
+add_setup(async function setup_fakePaths() {
+  let pathId;
+  if (AppConstants.platform == "macosx") {
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    pathId = "LocalAppData";
+  } else {
+    pathId = "Home";
+  }
+  registerFakePath(pathId, rootDir);
+});
+
+/**
+ * This function creates a testing database in the default profile,
+ * populates it with 10 example data entries,migrates the database,
+ * and then searches for each entry to ensure it exists in the FormHistory.
+ *
+ * @async
+ * @param {string} migratorKey
+ *    A string that identifies the type of migrator object to be retrieved.
+ * @param {Array<string>} subDirs
+ *    An array of strings that specifies the subdirectories for the target profile directory.
+ * @returns {Promise<undefined>}
+ *    A Promise that resolves when the migration is completed.
+ */
+async function testFormdata(migratorKey, subDirs) {
+  if (AppConstants.platform == "macosx") {
+    subDirs.unshift("Application Support");
+  } else if (AppConstants.platform == "win") {
+    subDirs.push("User Data");
+  } else {
+    subDirs.unshift(".config");
+  }
+
+  let target = rootDir.clone();
+  // Pretend this is the default profile
+  subDirs.push("Default");
+  while (subDirs.length) {
+    target.append(subDirs.shift());
+  }
+
+  await IOUtils.makeDirectory(target.path, {
+    createAncestor: true,
+    ignoreExisting: true,
+  });
+
+  target.append("Web Data");
+  await IOUtils.remove(target.path, { ignoreAbsent: true });
+
+  // Clear any search history results
+  await FormHistory.update({ op: "remove" });
+
+  let dbConn = await Sqlite.openConnection({ path: target.path });
+
+  await dbConn.execute(
+    `CREATE TABLE "autofill" (name VARCHAR, value VARCHAR, value_lower VARCHAR, date_created INTEGER DEFAULT 0, date_last_used INTEGER DEFAULT 0, count INTEGER DEFAULT 1, PRIMARY KEY (name, value))`
+  );
+  for (let i = 0; i < 10; i++) {
+    await dbConn.execute(
+      `INSERT INTO autofill VALUES (:name, :value, :value_lower, :date_created, :date_last_used, :count)`,
+      {
+        name: `name${i}`,
+        value: `example${i}`,
+        value_lower: `example${i}`,
+        date_created: Math.round(Date.now() / 1000) - i * 10000,
+        date_last_used: Date.now(),
+        count: i,
+      }
+    );
+  }
+  await dbConn.close();
+
+  let migrator = await MigrationUtils.getMigrator(migratorKey);
+  // Sanity check for the source.
+  Assert.ok(await migrator.isSourceAvailable());
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.FORMDATA, {
+    id: "Default",
+    name: "Person 1",
+  });
+
+  for (let i = 0; i < 10; i++) {
+    let results = await FormHistory.search(["fieldname", "value"], {
+      fieldname: `name${i}`,
+      value: `example${i}`,
+    });
+    Assert.ok(results.length, `Should have item${i} in FormHistory`);
+  }
+}
+
+add_task(async function test_Chrome() {
+  let subDirs =
+    AppConstants.platform == "linux" ? ["google-chrome"] : ["Google", "Chrome"];
+  await testFormdata("chrome", subDirs);
+});
+
+add_task(async function test_ChromiumEdge() {
+  if (AppConstants.platform == "linux") {
+    // Edge isn't available on Linux.
+    return;
+  }
+  let subDirs =
+    AppConstants.platform == "macosx"
+      ? ["Microsoft Edge"]
+      : ["Microsoft", "Edge"];
+  await testFormdata("chromium-edge", subDirs);
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_history.js b/browser/components/migration/tests/unit/test_Chrome_history.js
new file mode 100644
index 0000000000..c88a6380c2
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_history.js
@@ -0,0 +1,206 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+
+const SOURCE_PROFILE_DIR = "Library/Application Support/Google/Chrome/Default/";
+
+const PROFILE = {
+  id: "Default",
+  name: "Person 1",
+};
+
+/**
+ * TEST_URLS reflects the data stored in '${SOURCE_PROFILE_DIR}HistoryMaster'.
+ * The main object reflects the data in the 'urls' table. The visits property
+ * reflects the associated data in the 'visits' table.
+ */
+const TEST_URLS = [
+  {
+    id: 1,
+    url: "http://example.com/",
+    title: "test",
+    visit_count: 1,
+    typed_count: 0,
+    last_visit_time: 13193151310368000,
+    hidden: 0,
+    visits: [
+      {
+        id: 1,
+        url: 1,
+        visit_time: 13193151310368000,
+        from_visit: 0,
+        transition: 805306370,
+        segment_id: 0,
+        visit_duration: 10745006,
+        incremented_omnibox_typed_score: 0,
+      },
+    ],
+  },
+  {
+    id: 2,
+    url: "http://invalid.com/",
+    title: "test2",
+    visit_count: 1,
+    typed_count: 0,
+    last_visit_time: 13193154948901000,
+    hidden: 0,
+    visits: [
+      {
+        id: 2,
+        url: 2,
+        visit_time: 13193154948901000,
+        from_visit: 0,
+        transition: 805306376,
+        segment_id: 0,
+        visit_duration: 6568270,
+        incremented_omnibox_typed_score: 0,
+      },
+    ],
+  },
+];
+
+async function setVisitTimes(time) {
+  let loginDataFile = do_get_file(`${SOURCE_PROFILE_DIR}History`);
+  let dbConn = await Sqlite.openConnection({ path: loginDataFile.path });
+
+  await dbConn.execute(`UPDATE urls SET last_visit_time = :last_visit_time`, {
+    last_visit_time: time,
+  });
+  await dbConn.execute(`UPDATE visits SET visit_time = :visit_time`, {
+    visit_time: time,
+  });
+
+  await dbConn.close();
+}
+
+function setExpectedVisitTimes(time) {
+  for (let urlInfo of TEST_URLS) {
+    urlInfo.last_visit_time = time;
+    urlInfo.visits[0].visit_time = time;
+  }
+}
+
+function assertEntryMatches(entry, urlInfo, dateWasInFuture = false) {
+  info(`Checking url: ${urlInfo.url}`);
+  Assert.ok(entry, `Should have stored an entry`);
+
+  Assert.equal(entry.url, urlInfo.url, "Should have the correct URL");
+  Assert.equal(entry.title, urlInfo.title, "Should have the correct title");
+  Assert.equal(
+    entry.visits.length,
+    urlInfo.visits.length,
+    "Should have the correct number of visits"
+  );
+
+  for (let index in urlInfo.visits) {
+    Assert.equal(
+      entry.visits[index].transition,
+      PlacesUtils.history.TRANSITIONS.LINK,
+      "Should have Link type transition"
+    );
+
+    if (dateWasInFuture) {
+      Assert.lessOrEqual(
+        entry.visits[index].date.getTime(),
+        new Date().getTime(),
+        "Should have moved the date to no later than the current date."
+      );
+    } else {
+      Assert.equal(
+        entry.visits[index].date.getTime(),
+        ChromeMigrationUtils.chromeTimeToDate(
+          urlInfo.visits[index].visit_time,
+          new Date()
+        ).getTime(),
+        "Should have the correct date"
+      );
+    }
+  }
+}
+
+function setupHistoryFile() {
+  removeHistoryFile();
+  let file = do_get_file(`${SOURCE_PROFILE_DIR}HistoryMaster`);
+  file.copyTo(file.parent, "History");
+}
+
+function removeHistoryFile() {
+  let file = do_get_file(`${SOURCE_PROFILE_DIR}History`, true);
+  try {
+    file.remove(false);
+  } catch (ex) {
+    // It is ok if this doesn't exist.
+    if (ex.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+      throw ex;
+    }
+  }
+}
+
+add_task(async function setup() {
+  registerFakePath("ULibDir", do_get_file("Library/"));
+
+  registerCleanupFunction(async () => {
+    await PlacesUtils.history.clear();
+    removeHistoryFile();
+  });
+});
+
+add_task(async function test_import() {
+  setupHistoryFile();
+  await PlacesUtils.history.clear();
+  // Update to ~10 days ago since the date can't be too old or Places may expire it.
+  const pastDate = new Date(new Date().getTime() - 1000 * 60 * 60 * 24 * 10);
+  const pastChromeTime = ChromeMigrationUtils.dateToChromeTime(pastDate);
+  await setVisitTimes(pastChromeTime);
+  setExpectedVisitTimes(pastChromeTime);
+
+  let migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(
+    await migrator.isSourceAvailable(),
+    "Sanity check the source exists"
+  );
+
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.HISTORY,
+    PROFILE
+  );
+
+  for (let urlInfo of TEST_URLS) {
+    let entry = await PlacesUtils.history.fetch(urlInfo.url, {
+      includeVisits: true,
+    });
+    assertEntryMatches(entry, urlInfo);
+  }
+});
+
+add_task(async function test_import_future_date() {
+  setupHistoryFile();
+  await PlacesUtils.history.clear();
+  const futureDate = new Date().getTime() + 6000 * 60 * 24;
+  await setVisitTimes(ChromeMigrationUtils.dateToChromeTime(futureDate));
+
+  let migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(
+    await migrator.isSourceAvailable(),
+    "Sanity check the source exists"
+  );
+
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.HISTORY,
+    PROFILE
+  );
+
+  for (let urlInfo of TEST_URLS) {
+    let entry = await PlacesUtils.history.fetch(urlInfo.url, {
+      includeVisits: true,
+    });
+    assertEntryMatches(entry, urlInfo, true);
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_passwords.js b/browser/components/migration/tests/unit/test_Chrome_passwords.js
new file mode 100644
index 0000000000..374b697c75
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_passwords.js
@@ -0,0 +1,373 @@
+"use strict";
+
+const PROFILE = {
+  id: "Default",
+  name: "Person 1",
+};
+
+const TEST_LOGINS = [
+  {
+    id: 1, // id of the row in the chrome login db
+    username: "username",
+    password: "password",
+    origin: "https://c9.io",
+    formActionOrigin: "https://c9.io",
+    httpRealm: null,
+    usernameField: "inputEmail",
+    passwordField: "inputPassword",
+    timeCreated: 1437418416037,
+    timePasswordChanged: 1437418416037,
+    timesUsed: 1,
+  },
+  {
+    id: 2,
+    username: "username@gmail.com",
+    password: "password2",
+    origin: "https://accounts.google.com",
+    formActionOrigin: "https://accounts.google.com",
+    httpRealm: null,
+    usernameField: "Email",
+    passwordField: "Passwd",
+    timeCreated: 1437418446598,
+    timePasswordChanged: 1437418446598,
+    timesUsed: 6,
+  },
+  {
+    id: 3,
+    username: "username",
+    password: "password3",
+    origin: "https://www.facebook.com",
+    formActionOrigin: "https://www.facebook.com",
+    httpRealm: null,
+    usernameField: "email",
+    passwordField: "pass",
+    timeCreated: 1437418478851,
+    timePasswordChanged: 1437418478851,
+    timesUsed: 1,
+  },
+  {
+    id: 4,
+    username: "user",
+    password: "اقرأPÀßwörd",
+    origin: "http://httpbin.org",
+    formActionOrigin: null,
+    httpRealm: "me@kennethreitz.com", // Digest auth.
+    usernameField: "",
+    passwordField: "",
+    timeCreated: 1437787462368,
+    timePasswordChanged: 1437787462368,
+    timesUsed: 1,
+  },
+  {
+    id: 5,
+    username: "buser",
+    password: "bpassword",
+    origin: "http://httpbin.org",
+    formActionOrigin: null,
+    httpRealm: "Fake Realm", // Basic auth.
+    usernameField: "",
+    passwordField: "",
+    timeCreated: 1437787539233,
+    timePasswordChanged: 1437787539233,
+    timesUsed: 1,
+  },
+  {
+    id: 6,
+    username: "username",
+    password: "password6",
+    origin: "https://www.example.com",
+    formActionOrigin: "", // NULL `action_url`
+    httpRealm: null,
+    usernameField: "",
+    passwordField: "pass",
+    timeCreated: 1557291348878,
+    timePasswordChanged: 1557291348878,
+    timesUsed: 1,
+  },
+  {
+    id: 7,
+    version: "v10",
+    username: "username",
+    password: "password",
+    origin: "https://v10.io",
+    formActionOrigin: "https://v10.io",
+    httpRealm: null,
+    usernameField: "inputEmail",
+    passwordField: "inputPassword",
+    timeCreated: 1437418416037,
+    timePasswordChanged: 1437418416037,
+    timesUsed: 1,
+  },
+];
+
+var loginCrypto;
+var dbConn;
+
+async function promiseSetPassword(login) {
+  const encryptedString = await loginCrypto.encryptData(
+    login.password,
+    login.version
+  );
+  info(`promiseSetPassword: ${encryptedString}`);
+  const passwordValue = new Uint8Array(
+    loginCrypto.stringToArray(encryptedString)
+  );
+  return dbConn.execute(
+    `UPDATE logins
+                         SET password_value = :password_value
+                         WHERE rowid = :rowid
+                        `,
+    { password_value: passwordValue, rowid: login.id }
+  );
+}
+
+function checkLoginsAreEqual(passwordManagerLogin, chromeLogin, id) {
+  passwordManagerLogin.QueryInterface(Ci.nsILoginMetaInfo);
+
+  Assert.equal(
+    passwordManagerLogin.username,
+    chromeLogin.username,
+    "The two logins ID " + id + " have the same username"
+  );
+  Assert.equal(
+    passwordManagerLogin.password,
+    chromeLogin.password,
+    "The two logins ID " + id + " have the same password"
+  );
+  Assert.equal(
+    passwordManagerLogin.origin,
+    chromeLogin.origin,
+    "The two logins ID " + id + " have the same origin"
+  );
+  Assert.equal(
+    passwordManagerLogin.formActionOrigin,
+    chromeLogin.formActionOrigin,
+    "The two logins ID " + id + " have the same formActionOrigin"
+  );
+  Assert.equal(
+    passwordManagerLogin.httpRealm,
+    chromeLogin.httpRealm,
+    "The two logins ID " + id + " have the same httpRealm"
+  );
+  Assert.equal(
+    passwordManagerLogin.usernameField,
+    chromeLogin.usernameField,
+    "The two logins ID " + id + " have the same usernameElement"
+  );
+  Assert.equal(
+    passwordManagerLogin.passwordField,
+    chromeLogin.passwordField,
+    "The two logins ID " + id + " have the same passwordElement"
+  );
+  Assert.equal(
+    passwordManagerLogin.timeCreated,
+    chromeLogin.timeCreated,
+    "The two logins ID " + id + " have the same timeCreated"
+  );
+  Assert.equal(
+    passwordManagerLogin.timePasswordChanged,
+    chromeLogin.timePasswordChanged,
+    "The two logins ID " + id + " have the same timePasswordChanged"
+  );
+  Assert.equal(
+    passwordManagerLogin.timesUsed,
+    chromeLogin.timesUsed,
+    "The two logins ID " + id + " have the same timesUsed"
+  );
+}
+
+function generateDifferentLogin(login) {
+  const newLogin = Cc["@mozilla.org/login-manager/loginInfo;1"].createInstance(
+    Ci.nsILoginInfo
+  );
+
+  newLogin.init(
+    login.origin,
+    login.formActionOrigin,
+    null,
+    login.username,
+    login.password + 1,
+    login.usernameField + 1,
+    login.passwordField + 1
+  );
+  newLogin.QueryInterface(Ci.nsILoginMetaInfo);
+  newLogin.timeCreated = login.timeCreated + 1;
+  newLogin.timePasswordChanged = login.timePasswordChanged + 1;
+  newLogin.timesUsed = login.timesUsed + 1;
+  return newLogin;
+}
+
+add_task(async function setup() {
+  let dirSvcPath;
+  let pathId;
+  let profilePathSegments;
+
+  // Use a mock service and account name to avoid a Keychain auth. prompt that
+  // would block the test from finishing if Chrome has already created a matching
+  // Keychain entry. This allows us to still exercise the keychain lookup code.
+  // The mock encryption passphrase is used when the Keychain item isn't found.
+  const mockMacOSKeychain = {
+    passphrase: "bW96aWxsYWZpcmVmb3g=",
+    serviceName: "TESTING Chrome Safe Storage",
+    accountName: "TESTING Chrome",
+  };
+  if (AppConstants.platform == "macosx") {
+    const { ChromeMacOSLoginCrypto } = ChromeUtils.importESModule(
+      "resource:///modules/ChromeMacOSLoginCrypto.sys.mjs"
+    );
+    loginCrypto = new ChromeMacOSLoginCrypto(
+      mockMacOSKeychain.serviceName,
+      mockMacOSKeychain.accountName,
+      mockMacOSKeychain.passphrase
+    );
+    dirSvcPath = "Library/";
+    pathId = "ULibDir";
+    profilePathSegments = [
+      "Application Support",
+      "Google",
+      "Chrome",
+      "Default",
+      "Login Data",
+    ];
+  } else if (AppConstants.platform == "win") {
+    const { ChromeWindowsLoginCrypto } = ChromeUtils.importESModule(
+      "resource:///modules/ChromeWindowsLoginCrypto.sys.mjs"
+    );
+    loginCrypto = new ChromeWindowsLoginCrypto("Chrome");
+    dirSvcPath = "AppData/Local/";
+    pathId = "LocalAppData";
+    profilePathSegments = [
+      "Google",
+      "Chrome",
+      "User Data",
+      "Default",
+      "Login Data",
+    ];
+  } else {
+    throw new Error("Not implemented");
+  }
+  const dirSvcFile = do_get_file(dirSvcPath);
+  registerFakePath(pathId, dirSvcFile);
+
+  info(PathUtils.join(dirSvcFile.path, ...profilePathSegments));
+  const loginDataFilePath = PathUtils.join(
+    dirSvcFile.path,
+    ...profilePathSegments
+  );
+  dbConn = await Sqlite.openConnection({ path: loginDataFilePath });
+
+  if (AppConstants.platform == "macosx") {
+    const migrator = await MigrationUtils.getMigrator("chrome");
+    Object.assign(migrator, {
+      _keychainServiceName: mockMacOSKeychain.serviceName,
+      _keychainAccountName: mockMacOSKeychain.accountName,
+      _keychainMockPassphrase: mockMacOSKeychain.passphrase,
+    });
+  }
+
+  registerCleanupFunction(() => {
+    Services.logins.removeAllUserFacingLogins();
+    if (loginCrypto.finalize) {
+      loginCrypto.finalize();
+    }
+    return dbConn.close();
+  });
+});
+
+add_task(async function test_importIntoEmptyDB() {
+  for (const login of TEST_LOGINS) {
+    await promiseSetPassword(login);
+  }
+
+  const migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(
+    await migrator.isSourceAvailable(),
+    "Sanity check the source exists"
+  );
+
+  let logins = await Services.logins.getAllLogins();
+  Assert.equal(logins.length, 0, "There are no logins initially");
+
+  // Migrate the logins.
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.PASSWORDS,
+    PROFILE,
+    true
+  );
+
+  logins = await Services.logins.getAllLogins();
+  Assert.equal(
+    logins.length,
+    TEST_LOGINS.length,
+    "Check login count after importing the data"
+  );
+  Assert.equal(
+    logins.length,
+    MigrationUtils._importQuantities.logins,
+    "Check telemetry matches the actual import."
+  );
+
+  for (let i = 0; i < TEST_LOGINS.length; i++) {
+    checkLoginsAreEqual(logins[i], TEST_LOGINS[i], i + 1);
+  }
+});
+
+// Test that existing logins for the same primary key don't get overwritten
+add_task(async function test_importExistingLogins() {
+  const migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(
+    await migrator.isSourceAvailable(),
+    "Sanity check the source exists"
+  );
+
+  Services.logins.removeAllUserFacingLogins();
+  let logins = await Services.logins.getAllLogins();
+  Assert.equal(
+    logins.length,
+    0,
+    "There are no logins after removing all of them"
+  );
+
+  const newLogins = [];
+
+  // Create 3 new logins that are different but where the key properties are still the same.
+  for (let i = 0; i < 3; i++) {
+    newLogins.push(generateDifferentLogin(TEST_LOGINS[i]));
+    await Services.logins.addLoginAsync(newLogins[i]);
+  }
+
+  logins = await Services.logins.getAllLogins();
+  Assert.equal(
+    logins.length,
+    newLogins.length,
+    "Check login count after the insertion"
+  );
+
+  for (let i = 0; i < newLogins.length; i++) {
+    checkLoginsAreEqual(logins[i], newLogins[i], i + 1);
+  }
+  // Migrate the logins.
+  await promiseMigration(
+    migrator,
+    MigrationUtils.resourceTypes.PASSWORDS,
+    PROFILE,
+    true
+  );
+
+  logins = await Services.logins.getAllLogins();
+  Assert.equal(
+    logins.length,
+    TEST_LOGINS.length,
+    "Check there are still the same number of logins after re-importing the data"
+  );
+  Assert.equal(
+    logins.length,
+    MigrationUtils._importQuantities.logins,
+    "Check telemetry matches the actual import."
+  );
+
+  for (let i = 0; i < newLogins.length; i++) {
+    checkLoginsAreEqual(logins[i], newLogins[i], i + 1);
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_passwords_emptySource.js b/browser/components/migration/tests/unit/test_Chrome_passwords_emptySource.js
new file mode 100644
index 0000000000..0e6993fded
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_passwords_emptySource.js
@@ -0,0 +1,43 @@
+"use strict";
+
+const { ChromeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeProfileMigrator.sys.mjs"
+);
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+add_task(async function test_importEmptyDBWithoutAuthPrompts() {
+  let dirSvcPath;
+  let pathId;
+
+  if (AppConstants.platform == "macosx") {
+    dirSvcPath = "LibraryWithNoData/";
+    pathId = "ULibDir";
+  } else if (AppConstants.platform == "win") {
+    dirSvcPath = "AppData/LocalWithNoData/";
+    pathId = "LocalAppData";
+  } else {
+    throw new Error("Not implemented");
+  }
+  let dirSvcFile = do_get_file(dirSvcPath);
+  registerFakePath(pathId, dirSvcFile);
+
+  let sandbox = sinon.createSandbox();
+  sandbox
+    .stub(ChromeProfileMigrator.prototype, "canGetPermissions")
+    .resolves(true);
+  sandbox
+    .stub(ChromeProfileMigrator.prototype, "hasPermissions")
+    .resolves(true);
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = await MigrationUtils.getMigrator("chrome");
+  Assert.ok(
+    !migrator,
+    "Migrator should not be available since there are no passwords"
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_Chrome_permissions.js b/browser/components/migration/tests/unit/test_Chrome_permissions.js
new file mode 100644
index 0000000000..6dfd8bcceb
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Chrome_permissions.js
@@ -0,0 +1,205 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that if the migrator does not have the permission to
+ * read from the Chrome data directory, that it can request
+ * permission to read from it, if the system allows.
+ */
+
+const { ChromeMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeMigrationUtils.sys.mjs"
+);
+
+const { ChromeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/ChromeProfileMigrator.sys.mjs"
+);
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+const { MockFilePicker } = ChromeUtils.importESModule(
+  "resource://testing-common/MockFilePicker.sys.mjs"
+);
+
+let gTempDir;
+
+add_setup(async () => {
+  Services.prefs.setBoolPref(
+    "browser.migrate.chrome.get_permissions.enabled",
+    true
+  );
+  gTempDir = do_get_tempdir();
+  await IOUtils.writeJSON(PathUtils.join(gTempDir.path, "Local State"), []);
+
+  MockFilePicker.init(globalThis);
+  registerCleanupFunction(() => {
+    MockFilePicker.cleanup();
+  });
+});
+
+/**
+ * Tests that canGetPermissions will return false if the platform does
+ * not allow for folder selection in the native file picker, and returns
+ * the data path otherwise.
+ */
+add_task(async function test_canGetPermissions() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new ChromeProfileMigrator();
+  let canGetPermissionsStub = sandbox
+    .stub(MigrationUtils, "canGetPermissionsOnPlatform")
+    .resolves(false);
+  sandbox.stub(ChromeMigrationUtils, "getDataPath").resolves(gTempDir.path);
+
+  Assert.ok(
+    !(await migrator.canGetPermissions()),
+    "Should not be able to get permissions."
+  );
+
+  canGetPermissionsStub.resolves(true);
+
+  Assert.equal(
+    await migrator.canGetPermissions(),
+    gTempDir.path,
+    "Should be able to get the permissions path."
+  );
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that getPermissions will show the native file picker in a
+ * loop until either the user cancels or selects a folder that grants
+ * read permissions to the data directory.
+ */
+add_task(async function test_getPermissions() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new ChromeProfileMigrator();
+  sandbox.stub(MigrationUtils, "canGetPermissionsOnPlatform").resolves(true);
+  sandbox.stub(ChromeMigrationUtils, "getDataPath").resolves(gTempDir.path);
+  let hasPermissionsStub = sandbox
+    .stub(migrator, "hasPermissions")
+    .resolves(false);
+
+  Assert.equal(
+    await migrator.canGetPermissions(),
+    gTempDir.path,
+    "Should be able to get the permissions path."
+  );
+
+  let filePickerSeenCount = 0;
+
+  let filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      MockFilePicker.useDirectory([gTempDir.path]);
+      filePickerSeenCount++;
+      if (filePickerSeenCount > 3) {
+        Assert.ok(true, "File picker looped 3 times.");
+        hasPermissionsStub.resolves(true);
+        resolve();
+      }
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnOK;
+  Assert.ok(
+    await migrator.getPermissions(),
+    "Should report that we got permissions."
+  );
+
+  await filePickerShownPromise;
+
+  // Make sure that the user can also hit "cancel" and that we
+  // file picker loop.
+
+  hasPermissionsStub.resolves(false);
+
+  filePickerSeenCount = 0;
+  filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      filePickerSeenCount++;
+      Assert.equal(filePickerSeenCount, 1, "Saw the picker once.");
+      resolve();
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnCancel;
+  Assert.ok(
+    !(await migrator.getPermissions()),
+    "Should report that we didn't get permissions."
+  );
+  await filePickerShownPromise;
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that if the native file picker chooses a different directory
+ * than the one we originally asked for, that we remap attempts to
+ * read profiles from that new directory. This is because Ubuntu Snaps
+ * will return us paths from the native file picker that are symlinks
+ * to the original directories.
+ */
+add_task(async function test_remapDirectories() {
+  let remapDir = new FileUtils.File(
+    await IOUtils.createUniqueDirectory(
+      PathUtils.tempDir,
+      "test-chrome-migration"
+    )
+  );
+  let localStatePath = PathUtils.join(remapDir.path, "Local State");
+  await IOUtils.writeJSON(localStatePath, []);
+
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new ChromeProfileMigrator();
+  sandbox.stub(MigrationUtils, "canGetPermissionsOnPlatform").resolves(true);
+  sandbox.stub(ChromeMigrationUtils, "getDataPath").resolves(gTempDir.path);
+  let hasPermissionsStub = sandbox
+    .stub(migrator, "hasPermissions")
+    .resolves(false);
+
+  Assert.equal(
+    await migrator.canGetPermissions(),
+    gTempDir.path,
+    "Should be able to get the permissions path."
+  );
+
+  let filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      MockFilePicker.useDirectory([remapDir.path]);
+      hasPermissionsStub.resolves(true);
+      resolve();
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnOK;
+  Assert.ok(
+    await migrator.getPermissions(),
+    "Should report that we got permissions."
+  );
+
+  Assert.equal(
+    PathUtils.normalize(await migrator.canGetPermissions()),
+    PathUtils.normalize(remapDir.path),
+    "Should be able to get the remapped permissions path."
+  );
+
+  await filePickerShownPromise;
+
+  sandbox.restore();
+});
diff --git a/browser/components/migration/tests/unit/test_Edge_db_migration.js b/browser/components/migration/tests/unit/test_Edge_db_migration.js
new file mode 100644
index 0000000000..3b2672d9d8
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Edge_db_migration.js
@@ -0,0 +1,849 @@
+"use strict";
+
+const { ctypes } = ChromeUtils.importESModule(
+  "resource://gre/modules/ctypes.sys.mjs"
+);
+const { ESE, KERNEL, gLibs, COLUMN_TYPES, declareESEFunction, loadLibraries } =
+  ChromeUtils.importESModule("resource:///modules/ESEDBReader.sys.mjs");
+const { EdgeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/EdgeProfileMigrator.sys.mjs"
+);
+
+let gESEInstanceCounter = 1;
+
+ESE.JET_COLUMNCREATE_W = new ctypes.StructType("JET_COLUMNCREATE_W", [
+  { cbStruct: ctypes.unsigned_long },
+  { szColumnName: ESE.JET_PCWSTR },
+  { coltyp: ESE.JET_COLTYP },
+  { cbMax: ctypes.unsigned_long },
+  { grbit: ESE.JET_GRBIT },
+  { pvDefault: ctypes.voidptr_t },
+  { cbDefault: ctypes.unsigned_long },
+  { cp: ctypes.unsigned_long },
+  { columnid: ESE.JET_COLUMNID },
+  { err: ESE.JET_ERR },
+]);
+
+function createColumnCreationWrapper({ name, type, cbMax }) {
+  // We use a wrapper object because we need to be sure the JS engine won't GC
+  // data that we're "only" pointing to.
+  let wrapper = {};
+  wrapper.column = new ESE.JET_COLUMNCREATE_W();
+  wrapper.column.cbStruct = ESE.JET_COLUMNCREATE_W.size;
+  let wchar_tArray = ctypes.ArrayType(ctypes.char16_t);
+  wrapper.name = new wchar_tArray(name.length + 1);
+  wrapper.name.value = String(name);
+  wrapper.column.szColumnName = wrapper.name;
+  wrapper.column.coltyp = type;
+  let fallback = 0;
+  switch (type) {
+    case COLUMN_TYPES.JET_coltypText:
+      fallback = 255;
+    // Intentional fall-through
+    case COLUMN_TYPES.JET_coltypLongText:
+      wrapper.column.cbMax = cbMax || fallback || 64 * 1024;
+      break;
+    case COLUMN_TYPES.JET_coltypGUID:
+      wrapper.column.cbMax = 16;
+      break;
+    case COLUMN_TYPES.JET_coltypBit:
+      wrapper.column.cbMax = 1;
+      break;
+    case COLUMN_TYPES.JET_coltypLongLong:
+      wrapper.column.cbMax = 8;
+      break;
+    default:
+      throw new Error("Unknown column type!");
+  }
+
+  wrapper.column.columnid = new ESE.JET_COLUMNID();
+  wrapper.column.grbit = 0;
+  wrapper.column.pvDefault = null;
+  wrapper.column.cbDefault = 0;
+  wrapper.column.cp = 0;
+
+  return wrapper;
+}
+
+// "forward declarations" of indexcreate and setinfo structs, which we don't use.
+ESE.JET_INDEXCREATE = new ctypes.StructType("JET_INDEXCREATE");
+ESE.JET_SETINFO = new ctypes.StructType("JET_SETINFO");
+
+ESE.JET_TABLECREATE_W = new ctypes.StructType("JET_TABLECREATE_W", [
+  { cbStruct: ctypes.unsigned_long },
+  { szTableName: ESE.JET_PCWSTR },
+  { szTemplateTableName: ESE.JET_PCWSTR },
+  { ulPages: ctypes.unsigned_long },
+  { ulDensity: ctypes.unsigned_long },
+  { rgcolumncreate: ESE.JET_COLUMNCREATE_W.ptr },
+  { cColumns: ctypes.unsigned_long },
+  { rgindexcreate: ESE.JET_INDEXCREATE.ptr },
+  { cIndexes: ctypes.unsigned_long },
+  { grbit: ESE.JET_GRBIT },
+  { tableid: ESE.JET_TABLEID },
+  { cCreated: ctypes.unsigned_long },
+]);
+
+function createTableCreationWrapper(tableName, columns) {
+  let wrapper = {};
+  let wchar_tArray = ctypes.ArrayType(ctypes.char16_t);
+  wrapper.name = new wchar_tArray(tableName.length + 1);
+  wrapper.name.value = String(tableName);
+  wrapper.table = new ESE.JET_TABLECREATE_W();
+  wrapper.table.cbStruct = ESE.JET_TABLECREATE_W.size;
+  wrapper.table.szTableName = wrapper.name;
+  wrapper.table.szTemplateTableName = null;
+  wrapper.table.ulPages = 1;
+  wrapper.table.ulDensity = 0;
+  let columnArrayType = ESE.JET_COLUMNCREATE_W.array(columns.length);
+  wrapper.columnAry = new columnArrayType();
+  wrapper.table.rgcolumncreate = wrapper.columnAry.addressOfElement(0);
+  wrapper.table.cColumns = columns.length;
+  wrapper.columns = [];
+  for (let i = 0; i < columns.length; i++) {
+    let column = columns[i];
+    let columnWrapper = createColumnCreationWrapper(column);
+    wrapper.columnAry.addressOfElement(i).contents = columnWrapper.column;
+    wrapper.columns.push(columnWrapper);
+  }
+  wrapper.table.rgindexcreate = null;
+  wrapper.table.cIndexes = 0;
+  return wrapper;
+}
+
+function convertValueForWriting(value, valueType) {
+  let buffer;
+  let valueOfValueType = ctypes.UInt64.lo(valueType);
+  switch (valueOfValueType) {
+    case COLUMN_TYPES.JET_coltypLongLong:
+      if (value instanceof Date) {
+        buffer = new KERNEL.FILETIME();
+        let sysTime = new KERNEL.SYSTEMTIME();
+        sysTime.wYear = value.getUTCFullYear();
+        sysTime.wMonth = value.getUTCMonth() + 1;
+        sysTime.wDay = value.getUTCDate();
+        sysTime.wHour = value.getUTCHours();
+        sysTime.wMinute = value.getUTCMinutes();
+        sysTime.wSecond = value.getUTCSeconds();
+        sysTime.wMilliseconds = value.getUTCMilliseconds();
+        let rv = KERNEL.SystemTimeToFileTime(
+          sysTime.address(),
+          buffer.address()
+        );
+        if (!rv) {
+          throw new Error("Failed to get FileTime.");
+        }
+        return [buffer, KERNEL.FILETIME.size];
+      }
+      throw new Error("Unrecognized value for longlong column");
+    case COLUMN_TYPES.JET_coltypLongText:
+      let wchar_tArray = ctypes.ArrayType(ctypes.char16_t);
+      buffer = new wchar_tArray(value.length + 1);
+      buffer.value = String(value);
+      return [buffer, buffer.length * 2];
+    case COLUMN_TYPES.JET_coltypBit:
+      buffer = new ctypes.uint8_t();
+      // Bizarre boolean values, but whatever:
+      buffer.value = value ? 255 : 0;
+      return [buffer, 1];
+    case COLUMN_TYPES.JET_coltypGUID:
+      let byteArray = ctypes.ArrayType(ctypes.uint8_t);
+      buffer = new byteArray(16);
+      let j = 0;
+      for (let i = 0; i < value.length; i++) {
+        if (!/[0-9a-f]/i.test(value[i])) {
+          continue;
+        }
+        let byteAsHex = value.substr(i, 2);
+        buffer[j++] = parseInt(byteAsHex, 16);
+        i++;
+      }
+      return [buffer, 16];
+  }
+
+  throw new Error("Unknown type " + valueType);
+}
+
+let initializedESE = false;
+
+let eseDBWritingHelpers = {
+  setupDB(dbFile, tables) {
+    if (!initializedESE) {
+      initializedESE = true;
+      loadLibraries();
+
+      KERNEL.SystemTimeToFileTime = gLibs.kernel.declare(
+        "SystemTimeToFileTime",
+        ctypes.winapi_abi,
+        ctypes.bool,
+        KERNEL.SYSTEMTIME.ptr,
+        KERNEL.FILETIME.ptr
+      );
+
+      declareESEFunction(
+        "CreateDatabaseW",
+        ESE.JET_SESID,
+        ESE.JET_PCWSTR,
+        ESE.JET_PCWSTR,
+        ESE.JET_DBID.ptr,
+        ESE.JET_GRBIT
+      );
+      declareESEFunction(
+        "CreateTableColumnIndexW",
+        ESE.JET_SESID,
+        ESE.JET_DBID,
+        ESE.JET_TABLECREATE_W.ptr
+      );
+      declareESEFunction("BeginTransaction", ESE.JET_SESID);
+      declareESEFunction("CommitTransaction", ESE.JET_SESID, ESE.JET_GRBIT);
+      declareESEFunction(
+        "PrepareUpdate",
+        ESE.JET_SESID,
+        ESE.JET_TABLEID,
+        ctypes.unsigned_long
+      );
+      declareESEFunction(
+        "Update",
+        ESE.JET_SESID,
+        ESE.JET_TABLEID,
+        ctypes.voidptr_t,
+        ctypes.unsigned_long,
+        ctypes.unsigned_long.ptr
+      );
+      declareESEFunction(
+        "SetColumn",
+        ESE.JET_SESID,
+        ESE.JET_TABLEID,
+        ESE.JET_COLUMNID,
+        ctypes.voidptr_t,
+        ctypes.unsigned_long,
+        ESE.JET_GRBIT,
+        ESE.JET_SETINFO.ptr
+      );
+      ESE.SetSystemParameterW(
+        null,
+        0,
+        64 /* JET_paramDatabasePageSize*/,
+        8192,
+        null
+      );
+    }
+
+    let rootPath = dbFile.parent.path + "\\";
+    let logPath = rootPath + "LogFiles\\";
+
+    try {
+      this._instanceId = new ESE.JET_INSTANCE();
+      ESE.CreateInstanceW(
+        this._instanceId.address(),
+        "firefox-dbwriter-" + gESEInstanceCounter++
+      );
+      this._instanceCreated = true;
+
+      ESE.SetSystemParameterW(
+        this._instanceId.address(),
+        0,
+        0 /* JET_paramSystemPath*/,
+        0,
+        rootPath
+      );
+      ESE.SetSystemParameterW(
+        this._instanceId.address(),
+        0,
+        1 /* JET_paramTempPath */,
+        0,
+        rootPath
+      );
+      ESE.SetSystemParameterW(
+        this._instanceId.address(),
+        0,
+        2 /* JET_paramLogFilePath*/,
+        0,
+        logPath
+      );
+      // Shouldn't try to call JetTerm if the following call fails.
+      this._instanceCreated = false;
+      ESE.Init(this._instanceId.address());
+      this._instanceCreated = true;
+      this._sessionId = new ESE.JET_SESID();
+      ESE.BeginSessionW(
+        this._instanceId,
+        this._sessionId.address(),
+        null,
+        null
+      );
+      this._sessionCreated = true;
+
+      this._dbId = new ESE.JET_DBID();
+      this._dbPath = rootPath + "spartan.edb";
+      ESE.CreateDatabaseW(
+        this._sessionId,
+        this._dbPath,
+        null,
+        this._dbId.address(),
+        0
+      );
+      this._opened = this._attached = true;
+
+      for (let [tableName, data] of tables) {
+        let { rows, columns } = data;
+        let tableCreationWrapper = createTableCreationWrapper(
+          tableName,
+          columns
+        );
+        ESE.CreateTableColumnIndexW(
+          this._sessionId,
+          this._dbId,
+          tableCreationWrapper.table.address()
+        );
+        this._tableId = tableCreationWrapper.table.tableid;
+
+        let columnIdMap = new Map();
+        if (rows.length) {
+          // Iterate over the struct we passed into ESENT because they have the
+          // created column ids.
+          let columnCount = ctypes.UInt64.lo(
+            tableCreationWrapper.table.cColumns
+          );
+          let columnsPassed = tableCreationWrapper.table.rgcolumncreate;
+          for (let i = 0; i < columnCount; i++) {
+            let column = columnsPassed.contents;
+            columnIdMap.set(column.szColumnName.readString(), column);
+            columnsPassed = columnsPassed.increment();
+          }
+          ESE.ManualMove(
+            this._sessionId,
+            this._tableId,
+            -2147483648 /* JET_MoveFirst */,
+            0
+          );
+          ESE.BeginTransaction(this._sessionId);
+          for (let row of rows) {
+            ESE.PrepareUpdate(
+              this._sessionId,
+              this._tableId,
+              0 /* JET_prepInsert */
+            );
+            for (let columnName in row) {
+              let col = columnIdMap.get(columnName);
+              let colId = col.columnid;
+              let [val, valSize] = convertValueForWriting(
+                row[columnName],
+                col.coltyp
+              );
+              /* JET_bitSetOverwriteLV */
+              ESE.SetColumn(
+                this._sessionId,
+                this._tableId,
+                colId,
+                val.address(),
+                valSize,
+                4,
+                null
+              );
+            }
+            let actualBookmarkSize = new ctypes.unsigned_long();
+            ESE.Update(
+              this._sessionId,
+              this._tableId,
+              null,
+              0,
+              actualBookmarkSize.address()
+            );
+          }
+          ESE.CommitTransaction(
+            this._sessionId,
+            0 /* JET_bitWaitLastLevel0Commit */
+          );
+        }
+      }
+    } finally {
+      try {
+        this._close();
+      } catch (ex) {
+        console.error(ex);
+      }
+    }
+  },
+
+  _close() {
+    if (this._tableId) {
+      ESE.FailSafeCloseTable(this._sessionId, this._tableId);
+      delete this._tableId;
+    }
+    if (this._opened) {
+      ESE.FailSafeCloseDatabase(this._sessionId, this._dbId, 0);
+      this._opened = false;
+    }
+    if (this._attached) {
+      ESE.FailSafeDetachDatabaseW(this._sessionId, this._dbPath);
+      this._attached = false;
+    }
+    if (this._sessionCreated) {
+      ESE.FailSafeEndSession(this._sessionId, 0);
+      this._sessionCreated = false;
+    }
+    if (this._instanceCreated) {
+      ESE.FailSafeTerm(this._instanceId);
+      this._instanceCreated = false;
+    }
+  },
+};
+
+add_task(async function () {
+  let tempFile = Services.dirsvc.get("TmpD", Ci.nsIFile);
+  tempFile.append("fx-xpcshell-edge-db");
+  tempFile.createUnique(tempFile.DIRECTORY_TYPE, 0o600);
+
+  let db = tempFile.clone();
+  db.append("spartan.edb");
+
+  let logs = tempFile.clone();
+  logs.append("LogFiles");
+  logs.create(tempFile.DIRECTORY_TYPE, 0o600);
+
+  let creationDate = new Date(Date.now() - 5000);
+  const kEdgeMenuParent = "62d07e2b-5f0d-4e41-8426-5f5ec9717beb";
+  let bookmarkReferenceItems = [
+    {
+      URL: "http://www.mozilla.org/",
+      Title: "Mozilla",
+      DateUpdated: new Date(creationDate.valueOf() + 100),
+      ItemId: "1c00c10a-15f6-4618-92dd-22575102a4da",
+      ParentId: kEdgeMenuParent,
+      IsFolder: false,
+      IsDeleted: false,
+    },
+    {
+      Title: "Folder",
+      DateUpdated: new Date(creationDate.valueOf() + 200),
+      ItemId: "564b21f2-05d6-4f7d-8499-304d00ccc3aa",
+      ParentId: kEdgeMenuParent,
+      IsFolder: true,
+      IsDeleted: false,
+    },
+    {
+      Title: "Item in folder",
+      URL: "http://www.iteminfolder.org/",
+      DateUpdated: new Date(creationDate.valueOf() + 300),
+      ItemId: "c295ddaf-04a1-424a-866c-0ebde011e7c8",
+      ParentId: "564b21f2-05d6-4f7d-8499-304d00ccc3aa",
+      IsFolder: false,
+      IsDeleted: false,
+    },
+    {
+      Title: "Deleted folder",
+      DateUpdated: new Date(creationDate.valueOf() + 400),
+      ItemId: "a547573c-4d4d-4406-a736-5b5462d93bca",
+      ParentId: kEdgeMenuParent,
+      IsFolder: true,
+      IsDeleted: true,
+    },
+    {
+      Title: "Deleted item",
+      URL: "http://www.deleteditem.org/",
+      DateUpdated: new Date(creationDate.valueOf() + 500),
+      ItemId: "37a574bb-b44b-4bbc-a414-908615536435",
+      ParentId: kEdgeMenuParent,
+      IsFolder: false,
+      IsDeleted: true,
+    },
+    {
+      Title: "Item in deleted folder (should be in root)",
+      URL: "http://www.itemindeletedfolder.org/",
+      DateUpdated: new Date(creationDate.valueOf() + 600),
+      ItemId: "74dd1cc3-4c5d-471f-bccc-7bc7c72fa621",
+      ParentId: "a547573c-4d4d-4406-a736-5b5462d93bca",
+      IsFolder: false,
+      IsDeleted: false,
+    },
+    {
+      Title: "_Favorites_Bar_",
+      DateUpdated: new Date(creationDate.valueOf() + 700),
+      ItemId: "921dc8a0-6c83-40ef-8df1-9bd1c5c56aaf",
+      ParentId: kEdgeMenuParent,
+      IsFolder: true,
+      IsDeleted: false,
+    },
+    {
+      Title: "Item in favorites bar",
+      URL: "http://www.iteminfavoritesbar.org/",
+      DateUpdated: new Date(creationDate.valueOf() + 800),
+      ItemId: "9f2b1ff8-b651-46cf-8f41-16da8bcb6791",
+      ParentId: "921dc8a0-6c83-40ef-8df1-9bd1c5c56aaf",
+      IsFolder: false,
+      IsDeleted: false,
+    },
+  ];
+
+  let readingListReferenceItems = [
+    {
+      Title: "Some mozilla page",
+      URL: "http://www.mozilla.org/somepage/",
+      AddedDate: new Date(creationDate.valueOf() + 900),
+      ItemId: "c88426fd-52a7-419d-acbc-d2310e8afebe",
+      IsDeleted: false,
+    },
+    {
+      Title: "Some other page",
+      URL: "https://www.example.org/somepage/",
+      AddedDate: new Date(creationDate.valueOf() + 1000),
+      ItemId: "a35fc843-5d5a-4d1e-9be8-45214be24b5c",
+      IsDeleted: false,
+    },
+  ];
+
+  // The following entries are expected to be skipped as being too old to
+  // migrate.
+  let expiredTypedURLsReferenceItems = [
+    {
+      URL: "https://expired1.invalid/",
+      AccessDateTimeUTC: dateDaysAgo(500),
+    },
+    {
+      URL: "https://expired2.invalid/",
+      AccessDateTimeUTC: dateDaysAgo(300),
+    },
+    {
+      URL: "https://expired3.invalid/",
+      AccessDateTimeUTC: dateDaysAgo(190),
+    },
+  ];
+
+  // The following entries should be new enough to migrate.
+  let unexpiredTypedURLsReferenceItems = [
+    {
+      URL: "https://unexpired1.invalid/",
+      AccessDateTimeUTC: dateDaysAgo(179),
+    },
+    {
+      URL: "https://unexpired2.invalid/",
+      AccessDateTimeUTC: dateDaysAgo(50),
+    },
+    {
+      URL: "https://unexpired3.invalid/",
+    },
+  ];
+
+  let typedURLsReferenceItems = [
+    ...expiredTypedURLsReferenceItems,
+    ...unexpiredTypedURLsReferenceItems,
+  ];
+
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS < 300,
+    "This test expects the current pref to be less than the youngest expired visit."
+  );
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS > 160,
+    "This test expects the current pref to be greater than the oldest unexpired visit."
+  );
+
+  eseDBWritingHelpers.setupDB(
+    db,
+    new Map([
+      [
+        "Favorites",
+        {
+          columns: [
+            { type: COLUMN_TYPES.JET_coltypLongText, name: "URL", cbMax: 4096 },
+            {
+              type: COLUMN_TYPES.JET_coltypLongText,
+              name: "Title",
+              cbMax: 4096,
+            },
+            { type: COLUMN_TYPES.JET_coltypLongLong, name: "DateUpdated" },
+            { type: COLUMN_TYPES.JET_coltypGUID, name: "ItemId" },
+            { type: COLUMN_TYPES.JET_coltypBit, name: "IsDeleted" },
+            { type: COLUMN_TYPES.JET_coltypBit, name: "IsFolder" },
+            { type: COLUMN_TYPES.JET_coltypGUID, name: "ParentId" },
+          ],
+          rows: bookmarkReferenceItems,
+        },
+      ],
+      [
+        "ReadingList",
+        {
+          columns: [
+            { type: COLUMN_TYPES.JET_coltypLongText, name: "URL", cbMax: 4096 },
+            {
+              type: COLUMN_TYPES.JET_coltypLongText,
+              name: "Title",
+              cbMax: 4096,
+            },
+            { type: COLUMN_TYPES.JET_coltypLongLong, name: "AddedDate" },
+            { type: COLUMN_TYPES.JET_coltypGUID, name: "ItemId" },
+            { type: COLUMN_TYPES.JET_coltypBit, name: "IsDeleted" },
+          ],
+          rows: readingListReferenceItems,
+        },
+      ],
+      [
+        "TypedURLs",
+        {
+          columns: [
+            { type: COLUMN_TYPES.JET_coltypLongText, name: "URL", cbMax: 4096 },
+            {
+              type: COLUMN_TYPES.JET_coltypLongLong,
+              name: "AccessDateTimeUTC",
+            },
+          ],
+          rows: typedURLsReferenceItems,
+        },
+      ],
+    ])
+  );
+
+  // Manually create an EdgeProfileMigrator rather than going through
+  // MigrationUtils.getMigrator to avoid the user data availability check, since
+  // we're mocking out that stuff.
+  let migrator = new EdgeProfileMigrator();
+  let bookmarksMigrator = migrator.getBookmarksMigratorForTesting(db);
+  Assert.ok(bookmarksMigrator.exists, "Should recognize db we just created");
+
+  let seenBookmarks = [];
+  let listener = events => {
+    for (let event of events) {
+      let {
+        id,
+        itemType,
+        url,
+        title,
+        dateAdded,
+        guid,
+        index,
+        parentGuid,
+        parentId,
+      } = event;
+      if (title.startsWith("Deleted")) {
+        ok(false, "Should not see deleted items being bookmarked!");
+      }
+      seenBookmarks.push({
+        id,
+        parentId,
+        index,
+        itemType,
+        url,
+        title,
+        dateAdded,
+        guid,
+        parentGuid,
+      });
+    }
+  };
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+
+  let migrateResult = await new Promise(resolve =>
+    bookmarksMigrator.migrate(resolve)
+  ).catch(ex => {
+    console.error(ex);
+    Assert.ok(false, "Got an exception trying to migrate data! " + ex);
+    return false;
+  });
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+  Assert.ok(migrateResult, "Migration should succeed");
+  Assert.equal(
+    seenBookmarks.length,
+    5,
+    "Should have seen 5 items being bookmarked."
+  );
+  Assert.equal(
+    seenBookmarks.length,
+    MigrationUtils._importQuantities.bookmarks,
+    "Telemetry should have items"
+  );
+
+  let menuParents = seenBookmarks.filter(
+    item => item.parentGuid == PlacesUtils.bookmarks.menuGuid
+  );
+  Assert.equal(
+    menuParents.length,
+    3,
+    "Bookmarks are added to the menu without a folder"
+  );
+  let toolbarParents = seenBookmarks.filter(
+    item => item.parentGuid == PlacesUtils.bookmarks.toolbarGuid
+  );
+  Assert.equal(
+    toolbarParents.length,
+    1,
+    "Should have a single item added to the toolbar"
+  );
+  let menuParentGuid = PlacesUtils.bookmarks.menuGuid;
+  let toolbarParentGuid = PlacesUtils.bookmarks.toolbarGuid;
+
+  let expectedTitlesInMenu = bookmarkReferenceItems
+    .filter(item => item.ParentId == kEdgeMenuParent)
+    .map(item => item.Title);
+  // Hacky, but seems like much the simplest way:
+  expectedTitlesInMenu.push("Item in deleted folder (should be in root)");
+  let expectedTitlesInToolbar = bookmarkReferenceItems
+    .filter(item => item.ParentId == "921dc8a0-6c83-40ef-8df1-9bd1c5c56aaf")
+    .map(item => item.Title);
+
+  for (let bookmark of seenBookmarks) {
+    let shouldBeInMenu = expectedTitlesInMenu.includes(bookmark.title);
+    let shouldBeInToolbar = expectedTitlesInToolbar.includes(bookmark.title);
+    if (bookmark.title == "Folder") {
+      Assert.equal(
+        bookmark.itemType,
+        PlacesUtils.bookmarks.TYPE_FOLDER,
+        "Bookmark " + bookmark.title + " should be a folder"
+      );
+    } else {
+      Assert.notEqual(
+        bookmark.itemType,
+        PlacesUtils.bookmarks.TYPE_FOLDER,
+        "Bookmark " + bookmark.title + " should not be a folder"
+      );
+    }
+
+    if (shouldBeInMenu) {
+      Assert.equal(
+        bookmark.parentGuid,
+        menuParentGuid,
+        "Item '" + bookmark.title + "' should be in menu"
+      );
+    } else if (shouldBeInToolbar) {
+      Assert.equal(
+        bookmark.parentGuid,
+        toolbarParentGuid,
+        "Item '" + bookmark.title + "' should be in toolbar"
+      );
+    } else if (
+      bookmark.guid == menuParentGuid ||
+      bookmark.guid == toolbarParentGuid
+    ) {
+      Assert.ok(
+        true,
+        "Expect toolbar and menu folders to not be in menu or toolbar"
+      );
+    } else {
+      // Bit hacky, but we do need to check this.
+      Assert.equal(
+        bookmark.title,
+        "Item in folder",
+        "Subfoldered item shouldn't be in menu or toolbar"
+      );
+      let parent = seenBookmarks.find(
+        maybeParent => maybeParent.guid == bookmark.parentGuid
+      );
+      Assert.equal(
+        parent && parent.title,
+        "Folder",
+        "Subfoldered item should be in subfolder labeled 'Folder'"
+      );
+    }
+
+    let dbItem = bookmarkReferenceItems.find(
+      someItem => bookmark.title == someItem.Title
+    );
+    if (!dbItem) {
+      Assert.ok(
+        [menuParentGuid, toolbarParentGuid].includes(bookmark.guid),
+        "This item should be one of the containers"
+      );
+    } else {
+      Assert.equal(dbItem.URL || "", bookmark.url, "URL is correct");
+      Assert.equal(
+        dbItem.DateUpdated.valueOf(),
+        new Date(bookmark.dateAdded).valueOf(),
+        "Date added is correct"
+      );
+    }
+  }
+
+  MigrationUtils._importQuantities.bookmarks = 0;
+  seenBookmarks = [];
+  listener = events => {
+    for (let event of events) {
+      let {
+        id,
+        itemType,
+        url,
+        title,
+        dateAdded,
+        guid,
+        index,
+        parentGuid,
+        parentId,
+      } = event;
+      seenBookmarks.push({
+        id,
+        parentId,
+        index,
+        itemType,
+        url,
+        title,
+        dateAdded,
+        guid,
+        parentGuid,
+      });
+    }
+  };
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+
+  let readingListMigrator = migrator.getReadingListMigratorForTesting(db);
+  Assert.ok(readingListMigrator.exists, "Should recognize db we just created");
+  migrateResult = await new Promise(resolve =>
+    readingListMigrator.migrate(resolve)
+  ).catch(ex => {
+    console.error(ex);
+    Assert.ok(false, "Got an exception trying to migrate data! " + ex);
+    return false;
+  });
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+  Assert.ok(migrateResult, "Migration should succeed");
+  Assert.equal(
+    seenBookmarks.length,
+    3,
+    "Should have seen 3 items being bookmarked (2 items + 1 folder)."
+  );
+  Assert.equal(
+    seenBookmarks.length,
+    MigrationUtils._importQuantities.bookmarks,
+    "Telemetry should have items"
+  );
+  let readingListContainerLabel = await MigrationUtils.getLocalizedString(
+    "migration-imported-edge-reading-list"
+  );
+
+  for (let bookmark of seenBookmarks) {
+    if (readingListContainerLabel == bookmark.title) {
+      continue;
+    }
+    let referenceItem = readingListReferenceItems.find(
+      item => item.Title == bookmark.title
+    );
+    Assert.ok(referenceItem, "Should have imported what we expected");
+    Assert.equal(referenceItem.URL, bookmark.url, "Should have the right URL");
+    readingListReferenceItems.splice(
+      readingListReferenceItems.findIndex(item => item.Title == bookmark.title),
+      1
+    );
+  }
+  Assert.ok(
+    !readingListReferenceItems.length,
+    "Should have seen all expected items."
+  );
+
+  let historyDBMigrator = migrator.getHistoryDBMigratorForTesting(db);
+  await new Promise(resolve => {
+    historyDBMigrator.migrate(resolve);
+  });
+  Assert.ok(true, "History DB migration done!");
+  for (let expiredEntry of expiredTypedURLsReferenceItems) {
+    let entry = await PlacesUtils.history.fetch(expiredEntry.URL, {
+      includeVisits: true,
+    });
+    Assert.equal(entry, null, "Should not have found an entry.");
+  }
+
+  for (let unexpiredEntry of unexpiredTypedURLsReferenceItems) {
+    let entry = await PlacesUtils.history.fetch(unexpiredEntry.URL, {
+      includeVisits: true,
+    });
+    Assert.equal(entry.url, unexpiredEntry.URL, "Should have the correct URL");
+    Assert.ok(!!entry.visits.length, "Should have some visits");
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_Edge_registry_migration.js b/browser/components/migration/tests/unit/test_Edge_registry_migration.js
new file mode 100644
index 0000000000..2a400f7858
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Edge_registry_migration.js
@@ -0,0 +1,81 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+const { EdgeProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/EdgeProfileMigrator.sys.mjs"
+);
+const { MSMigrationUtils } = ChromeUtils.importESModule(
+  "resource:///modules/MSMigrationUtils.sys.mjs"
+);
+
+/**
+ * Tests that history visits loaded from the registry from Edge (EdgeHTML)
+ * that have a visit date older than maxAgeInDays days do not get imported.
+ */
+add_task(async function test_Edge_history_past_max_days() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS < 300,
+    "This test expects the current pref to be less than the youngest expired visit."
+  );
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS > 160,
+    "This test expects the current pref to be greater than the oldest unexpired visit."
+  );
+
+  const EXPIRED_VISITS = [
+    ["https://test1.invalid/", dateDaysAgo(500).getTime() * 1000],
+    ["https://test2.invalid/", dateDaysAgo(450).getTime() * 1000],
+    ["https://test3.invalid/", dateDaysAgo(300).getTime() * 1000],
+  ];
+
+  const UNEXPIRED_VISITS = [
+    ["https://test4.invalid/"],
+    ["https://test5.invalid/", dateDaysAgo(160).getTime() * 1000],
+    ["https://test6.invalid/", dateDaysAgo(50).getTime() * 1000],
+    ["https://test7.invalid/", dateDaysAgo(0).getTime() * 1000],
+  ];
+
+  const ALL_VISITS = [...EXPIRED_VISITS, ...UNEXPIRED_VISITS];
+
+  // Fake out the getResources method of the migrator so that we return
+  // a single fake MigratorResource per availableResourceType.
+  sandbox.stub(MSMigrationUtils, "getTypedURLs").callsFake(() => {
+    return new Map(ALL_VISITS);
+  });
+
+  // Manually create an EdgeProfileMigrator rather than going through
+  // MigrationUtils.getMigrator to avoid the user data availability check, since
+  // we're mocking out that stuff.
+  let migrator = new EdgeProfileMigrator();
+  let registryTypedHistoryMigrator =
+    migrator.getHistoryRegistryMigratorForTesting();
+  await new Promise(resolve => {
+    registryTypedHistoryMigrator.migrate(resolve);
+  });
+  Assert.ok(true, "History from registry migration done!");
+
+  for (let expiredEntry of EXPIRED_VISITS) {
+    let entry = await PlacesUtils.history.fetch(expiredEntry[0], {
+      includeVisits: true,
+    });
+    Assert.equal(entry, null, "Should not have found an entry.");
+  }
+
+  for (let unexpiredEntry of UNEXPIRED_VISITS) {
+    let entry = await PlacesUtils.history.fetch(unexpiredEntry[0], {
+      includeVisits: true,
+    });
+    Assert.equal(entry.url, unexpiredEntry[0], "Should have the correct URL");
+    Assert.ok(!!entry.visits.length, "Should have some visits");
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_IE_bookmarks.js b/browser/components/migration/tests/unit/test_IE_bookmarks.js
new file mode 100644
index 0000000000..9816bb16e3
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_IE_bookmarks.js
@@ -0,0 +1,30 @@
+"use strict";
+
+add_task(async function () {
+  let migrator = await MigrationUtils.getMigrator("ie");
+  // Sanity check for the source.
+  Assert.ok(await migrator.isSourceAvailable(), "Check migrator source");
+
+  // Since this test doesn't mock out the favorites, execution is dependent
+  // on the actual favorites stored on the local machine's IE favorites database.
+  // As such, we can't assert that bookmarks were migrated to both the bookmarks
+  // menu and the bookmarks toolbar.
+  let itemCount = 0;
+  let listener = events => {
+    for (let event of events) {
+      if (event.itemType == PlacesUtils.bookmarks.TYPE_BOOKMARK) {
+        info("bookmark added: " + event.parentGuid);
+        itemCount++;
+      }
+    }
+  };
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.BOOKMARKS);
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+  Assert.equal(
+    MigrationUtils._importQuantities.bookmarks,
+    itemCount,
+    "Ensure telemetry matches actual number of imported items."
+  );
+});
diff --git a/browser/components/migration/tests/unit/test_IE_history.js b/browser/components/migration/tests/unit/test_IE_history.js
new file mode 100644
index 0000000000..f9a1e719a2
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_IE_history.js
@@ -0,0 +1,187 @@
+"use strict";
+
+const { MockRegistrar } = ChromeUtils.importESModule(
+  "resource://testing-common/MockRegistrar.sys.mjs"
+);
+
+// These match what we add to IE via InsertIEHistory.exe.
+const TEST_ENTRIES = [
+  {
+    url: "http://www.mozilla.org/1",
+    title: "Mozilla HTTP Test",
+  },
+  {
+    url: "https://www.mozilla.org/2",
+    // Test character encoding with a fox emoji:
+    title: "Mozilla HTTPS Test 🦊",
+  },
+];
+
+function insertIEHistory() {
+  let file = do_get_file("InsertIEHistory.exe", false);
+  let process = Cc["@mozilla.org/process/util;1"].createInstance(Ci.nsIProcess);
+  process.init(file);
+
+  let args = [];
+  process.run(true, args, args.length);
+
+  Assert.ok(!process.isRunning, "Should be done running");
+  Assert.equal(process.exitValue, 0, "Check exit code");
+}
+
+add_task(async function setup() {
+  await PlacesUtils.history.clear();
+
+  insertIEHistory();
+
+  registerCleanupFunction(async () => {
+    await PlacesUtils.history.clear();
+  });
+});
+
+add_task(async function test_IE_history() {
+  let migrator = await MigrationUtils.getMigrator("ie");
+  Assert.ok(await migrator.isSourceAvailable(), "Source is available");
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.HISTORY);
+
+  for (let { url, title } of TEST_ENTRIES) {
+    let entry = await PlacesUtils.history.fetch(url, { includeVisits: true });
+    Assert.equal(entry.url, url, "Should have the correct URL");
+    Assert.equal(entry.title, title, "Should have the correct title");
+    Assert.ok(!!entry.visits.length, "Should have some visits");
+  }
+
+  await PlacesUtils.history.clear();
+});
+
+/**
+ * Tests that history visits from IE that have a visit date older than
+ * maxAgeInDays days do not get imported.
+ */
+add_task(async function test_IE_history_past_max_days() {
+  // The InsertIEHistory program inserts two history visits using the MS COM
+  // IUrlHistoryStg interface. That interface does not allow us to dictate
+  // the visit times of those history visits. Thankfully, we can temporarily
+  // mock out the @mozilla.org/profile/migrator/iehistoryenumerator;1 to return
+  // some entries that we expect to expire.
+
+  /**
+   * An implmentation of nsISimpleEnumerator that wraps a JavaScript Array.
+   */
+  class nsSimpleEnumerator {
+    #items;
+    #nextIndex;
+
+    constructor(items) {
+      this.#items = items;
+      this.#nextIndex = 0;
+    }
+
+    hasMoreElements() {
+      return this.#nextIndex < this.#items.length;
+    }
+
+    getNext() {
+      if (!this.hasMoreElements()) {
+        throw Components.Exception("", Cr.NS_ERROR_NOT_AVAILABLE);
+      }
+
+      return this.#items[this.#nextIndex++];
+    }
+
+    [Symbol.iterator]() {
+      return this.#items.values();
+    }
+
+    QueryInterface = ChromeUtils.generateQI(["nsISimpleEnumerator"]);
+  }
+
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS < 300,
+    "This test expects the current pref to be less than the youngest expired visit."
+  );
+  Assert.ok(
+    MigrationUtils.HISTORY_MAX_AGE_IN_DAYS > 160,
+    "This test expects the current pref to be greater than the oldest unexpired visit."
+  );
+
+  const EXPIRED_VISITS = [
+    new Map([
+      ["uri", Services.io.newURI("https://test1.invalid")],
+      ["title", "Test history visit 1"],
+      ["time", PRTimeDaysAgo(500)],
+    ]),
+    new Map([
+      ["uri", Services.io.newURI("https://test2.invalid")],
+      ["title", "Test history visit 2"],
+      ["time", PRTimeDaysAgo(450)],
+    ]),
+    new Map([
+      ["uri", Services.io.newURI("https://test3.invalid")],
+      ["title", "Test history visit 3"],
+      ["time", PRTimeDaysAgo(300)],
+    ]),
+  ];
+
+  const UNEXPIRED_VISITS = [
+    new Map([
+      ["uri", Services.io.newURI("https://test4.invalid")],
+      ["title", "Test history visit 4"],
+    ]),
+    new Map([
+      ["uri", Services.io.newURI("https://test5.invalid")],
+      ["title", "Test history visit 5"],
+      ["time", PRTimeDaysAgo(160)],
+    ]),
+    new Map([
+      ["uri", Services.io.newURI("https://test6.invalid")],
+      ["title", "Test history visit 6"],
+      ["time", PRTimeDaysAgo(50)],
+    ]),
+    new Map([
+      ["uri", Services.io.newURI("https://test7.invalid")],
+      ["title", "Test history visit 7"],
+      ["time", PRTimeDaysAgo(0)],
+    ]),
+  ];
+
+  let fakeIEHistoryEnumerator = MockRegistrar.register(
+    "@mozilla.org/profile/migrator/iehistoryenumerator;1",
+    new nsSimpleEnumerator([...EXPIRED_VISITS, ...UNEXPIRED_VISITS])
+  );
+  registerCleanupFunction(() => {
+    MockRegistrar.unregister(fakeIEHistoryEnumerator);
+  });
+
+  let migrator = await MigrationUtils.getMigrator("ie");
+  Assert.ok(await migrator.isSourceAvailable(), "Source is available");
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.HISTORY);
+
+  for (let visit of EXPIRED_VISITS) {
+    let entry = await PlacesUtils.history.fetch(visit.get("uri").spec, {
+      includeVisits: true,
+    });
+    Assert.equal(entry, null, "Should not have found an entry.");
+  }
+
+  for (let visit of UNEXPIRED_VISITS) {
+    let entry = await PlacesUtils.history.fetch(visit.get("uri"), {
+      includeVisits: true,
+    });
+    Assert.equal(
+      entry.url,
+      visit.get("uri").spec,
+      "Should have the correct URL"
+    );
+    Assert.equal(
+      entry.title,
+      visit.get("title"),
+      "Should have the correct title"
+    );
+    Assert.ok(!!entry.visits.length, "Should have some visits");
+  }
+
+  await PlacesUtils.history.clear();
+});
diff --git a/browser/components/migration/tests/unit/test_MigrationUtils_timedRetry.js b/browser/components/migration/tests/unit/test_MigrationUtils_timedRetry.js
new file mode 100644
index 0000000000..83748d870d
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_MigrationUtils_timedRetry.js
@@ -0,0 +1,29 @@
+"use strict";
+
+let tmpFile = FileUtils.getDir("TmpD", []);
+let dbConn;
+
+add_task(async function setup() {
+  tmpFile.append("TestDB");
+  dbConn = await Sqlite.openConnection({ path: tmpFile.path });
+
+  registerCleanupFunction(async () => {
+    await dbConn.close();
+    await IOUtils.remove(tmpFile.path);
+  });
+});
+
+add_task(async function testgetRowsFromDBWithoutLocksRetries() {
+  let deferred = Promise.withResolvers();
+  let promise = MigrationUtils.getRowsFromDBWithoutLocks(
+    tmpFile.path,
+    "Temp DB",
+    "SELECT * FROM moz_temp_table",
+    deferred.promise
+  );
+  await new Promise(resolve => do_timeout(50, resolve));
+  dbConn
+    .execute("CREATE TABLE moz_temp_table (id INTEGER PRIMARY KEY)")
+    .then(deferred.resolve);
+  await promise;
+});
diff --git a/browser/components/migration/tests/unit/test_PasswordFileMigrator.js b/browser/components/migration/tests/unit/test_PasswordFileMigrator.js
new file mode 100644
index 0000000000..e22f207c5d
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_PasswordFileMigrator.js
@@ -0,0 +1,116 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { PasswordFileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/FileMigrators.sys.mjs"
+);
+const { LoginCSVImport } = ChromeUtils.importESModule(
+  "resource://gre/modules/LoginCSVImport.sys.mjs"
+);
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+const { MigrationWizardConstants } = ChromeUtils.importESModule(
+  "chrome://browser/content/migration/migration-wizard-constants.mjs"
+);
+
+add_setup(async function () {
+  Services.prefs.setBoolPref("signon.management.page.fileImport.enabled", true);
+  registerCleanupFunction(() => {
+    Services.prefs.clearUserPref("signon.management.page.fileImport.enabled");
+  });
+});
+
+/**
+ * Tests that the PasswordFileMigrator properly subclasses FileMigratorBase
+ * and delegates to the LoginCSVImport module.
+ */
+add_task(async function test_PasswordFileMigrator() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new PasswordFileMigrator();
+  Assert.ok(
+    migrator.constructor.key,
+    "PasswordFileMigrator implements static getter 'key'"
+  );
+  Assert.ok(
+    migrator.constructor.displayNameL10nID,
+    "PasswordFileMigrator implements static getter 'displayNameL10nID'"
+  );
+  Assert.ok(
+    await migrator.getFilePickerConfig(),
+    "PasswordFileMigrator returns something for getFilePickerConfig()"
+  );
+  Assert.ok(
+    migrator.displayedResourceTypes,
+    "PasswordFileMigrator returns something for displayedResourceTypes"
+  );
+  Assert.ok(migrator.enabled, "PasswordFileMigrator is enabled.");
+
+  const IMPORT_SUMMARY = [
+    {
+      result: "added",
+    },
+    {
+      result: "added",
+    },
+    {
+      result: "modified",
+    },
+  ];
+  const EXPECTED_SUCCESS_STATE = {
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_NEW]:
+      "2 added",
+    [MigrationWizardConstants.DISPLAYED_FILE_RESOURCE_TYPES.PASSWORDS_UPDATED]:
+      "1 updated",
+  };
+  const FAKE_PATH = "some/fake/path.csv";
+
+  let importFromCSVStub = sandbox
+    .stub(LoginCSVImport, "importFromCSV")
+    .callsFake(somePath => {
+      Assert.equal(somePath, FAKE_PATH, "Got expected path");
+      return Promise.resolve(IMPORT_SUMMARY);
+    });
+  let result = await migrator.migrate(FAKE_PATH);
+
+  Assert.ok(importFromCSVStub.called, "The stub should have been called.");
+  Assert.deepEqual(
+    result,
+    EXPECTED_SUCCESS_STATE,
+    "Got back the expected success state."
+  );
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that the PasswordFileMigrator will throw an exception with a
+ * consistent error message if the LoginCSVImport function rejects.
+ */
+add_task(async function test_PasswordFileMigrator_exception() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new PasswordFileMigrator();
+
+  const FAKE_PATH = "some/fake/path.csv";
+
+  sandbox.stub(LoginCSVImport, "importFromCSV").callsFake(() => {
+    return Promise.reject("Some error");
+  });
+
+  await Assert.rejects(
+    migrator.migrate(FAKE_PATH),
+    /The file doesn’t include any valid password data/
+  );
+
+  sandbox.restore();
+});
diff --git a/browser/components/migration/tests/unit/test_Safari_bookmarks.js b/browser/components/migration/tests/unit/test_Safari_bookmarks.js
new file mode 100644
index 0000000000..85be9f0049
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Safari_bookmarks.js
@@ -0,0 +1,85 @@
+"use strict";
+
+const { CustomizableUI } = ChromeUtils.importESModule(
+  "resource:///modules/CustomizableUI.sys.mjs"
+);
+
+add_task(async function () {
+  registerFakePath("ULibDir", do_get_file("Library/"));
+  const faviconPath = do_get_file(
+    "Library/Safari/Favicon Cache/favicons.db"
+  ).path;
+
+  let migrator = await MigrationUtils.getMigrator("safari");
+  // Sanity check for the source.
+  Assert.ok(await migrator.isSourceAvailable());
+
+  // Wait for the imported bookmarks. We don't check that "From Safari"
+  // folders are created on the toolbar since the profile
+  // we're importing to has less than 3 bookmarks in the destination
+  // so a "From Safari" folder isn't created.
+  let expectedParentGuids = [PlacesUtils.bookmarks.toolbarGuid];
+  let itemCount = 0;
+
+  let gotFolder = false;
+  let listener = events => {
+    for (let event of events) {
+      itemCount++;
+      if (
+        event.itemType == PlacesUtils.bookmarks.TYPE_FOLDER &&
+        event.title == "Food and Travel"
+      ) {
+        gotFolder = true;
+      }
+      if (expectedParentGuids.length) {
+        let index = expectedParentGuids.indexOf(event.parentGuid);
+        Assert.ok(index != -1, "Found expected parent");
+        expectedParentGuids.splice(index, 1);
+      }
+    }
+  };
+  PlacesUtils.observers.addListener(["bookmark-added"], listener);
+  let observerNotified = false;
+  Services.obs.addObserver((aSubject, aTopic, aData) => {
+    let [toolbar, visibility] = JSON.parse(aData);
+    Assert.equal(
+      toolbar,
+      CustomizableUI.AREA_BOOKMARKS,
+      "Notification should be received for bookmarks toolbar"
+    );
+    Assert.equal(
+      visibility,
+      "true",
+      "Notification should say to reveal the bookmarks toolbar"
+    );
+    observerNotified = true;
+  }, "browser-set-toolbar-visibility");
+
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.BOOKMARKS);
+  PlacesUtils.observers.removeListener(["bookmark-added"], listener);
+
+  // Check the bookmarks have been imported to all the expected parents.
+  Assert.ok(!expectedParentGuids.length, "No more expected parents");
+  Assert.ok(gotFolder, "Should have seen the folder get imported");
+  Assert.equal(itemCount, 14, "Should import all 14 items.");
+  // Check that the telemetry matches:
+  Assert.equal(
+    MigrationUtils._importQuantities.bookmarks,
+    itemCount,
+    "Telemetry reporting correct."
+  );
+
+  // Check that favicons migrated
+  let faviconURIs = await MigrationUtils.getRowsFromDBWithoutLocks(
+    faviconPath,
+    "Safari Bookmark Favicons",
+    `SELECT I.uuid, I.url AS favicon_url, P.url 
+    FROM icon_info I 
+    INNER JOIN page_url P ON I.uuid = P.uuid;`
+  );
+  let pageUrls = Array.from(faviconURIs, row =>
+    Services.io.newURI(row.getResultByName("url"))
+  );
+  await assertFavicons(pageUrls);
+  Assert.ok(observerNotified, "The observer should be notified upon migration");
+});
diff --git a/browser/components/migration/tests/unit/test_Safari_history.js b/browser/components/migration/tests/unit/test_Safari_history.js
new file mode 100644
index 0000000000..c5b1210073
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Safari_history.js
@@ -0,0 +1,101 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const HISTORY_TEMPLATE_FILE_PATH = "Library/Safari/HistoryTemplate.db";
+const HISTORY_FILE_PATH = "Library/Safari/History.db";
+
+// We want this to be some recent time, so we'll always add some time to our
+// dates to keep them ~ five days ago.
+const MS_FROM_REFERENCE_TIME =
+  new Date() - new Date("May 31, 2023 00:00:00 UTC");
+
+const TEST_URLS = [
+  {
+    url: "http://example.com/",
+    title: "Example Domain",
+    time: 706743588.04751,
+    jsTime: 1685050788047 + MS_FROM_REFERENCE_TIME,
+    visits: 1,
+  },
+  {
+    url: "http://mozilla.org/",
+    title: "",
+    time: 706743581.133386,
+    jsTime: 1685050781133 + MS_FROM_REFERENCE_TIME,
+    visits: 1,
+  },
+  {
+    url: "https://www.mozilla.org/en-CA/",
+    title: "Internet for people, not profit - Mozilla",
+    time: 706743581.133679,
+    jsTime: 1685050781133 + MS_FROM_REFERENCE_TIME,
+    visits: 1,
+  },
+];
+
+async function setupHistoryFile() {
+  removeHistoryFile();
+  let file = do_get_file(HISTORY_TEMPLATE_FILE_PATH);
+  file.copyTo(file.parent, "History.db");
+  await updateVisitTimes();
+}
+
+function removeHistoryFile() {
+  let file = do_get_file(HISTORY_FILE_PATH, true);
+  try {
+    file.remove(false);
+  } catch (ex) {
+    // It is ok if this doesn't exist.
+    if (ex.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+      throw ex;
+    }
+  }
+}
+
+async function updateVisitTimes() {
+  let cocoaDifference = MS_FROM_REFERENCE_TIME / 1000;
+  let historyFile = do_get_file(HISTORY_FILE_PATH);
+  let dbConn = await Sqlite.openConnection({ path: historyFile.path });
+  await dbConn.execute(
+    "UPDATE history_visits SET visit_time = visit_time + :difference;",
+    { difference: cocoaDifference }
+  );
+  await dbConn.close();
+}
+
+add_setup(async function setup() {
+  registerFakePath("ULibDir", do_get_file("Library/"));
+  await setupHistoryFile();
+  registerCleanupFunction(async () => {
+    await PlacesUtils.history.clear();
+    removeHistoryFile();
+  });
+});
+
+add_task(async function testHistoryImport() {
+  await PlacesUtils.history.clear();
+
+  let migrator = await MigrationUtils.getMigrator("safari");
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.HISTORY);
+
+  for (let urlInfo of TEST_URLS) {
+    let entry = await PlacesUtils.history.fetch(urlInfo.url, {
+      includeVisits: true,
+    });
+
+    Assert.equal(entry.url, urlInfo.url, "Should have the correct URL");
+    Assert.equal(entry.title, urlInfo.title, "Should have the correct title");
+    Assert.equal(
+      entry.visits.length,
+      urlInfo.visits,
+      "Should have the correct number of visits"
+    );
+    Assert.equal(
+      entry.visits[0].date.getTime(),
+      urlInfo.jsTime,
+      "Should have the correct date"
+    );
+  }
+});
diff --git a/browser/components/migration/tests/unit/test_Safari_history_strange_entries.js b/browser/components/migration/tests/unit/test_Safari_history_strange_entries.js
new file mode 100644
index 0000000000..2578353e35
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Safari_history_strange_entries.js
@@ -0,0 +1,115 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { PlacesQuery } = ChromeUtils.importESModule(
+  "resource://gre/modules/PlacesQuery.sys.mjs"
+);
+
+const HISTORY_FILE_PATH = "Library/Safari/History.db";
+const HISTORY_STRANGE_ENTRIES_FILE_PATH =
+  "Library/Safari/HistoryStrangeEntries.db";
+
+// By default, our migrators will cut off migrating any history older than
+// 180 days. In order to make sure this test continues to run correctly
+// in the future, we copy the reference database to History.db, and then
+// use Sqlite.sys.mjs to connect to it and manually update all of the visit
+// times to be "now", so that they all fall within the 180 day window. The
+// Nov 10th date below is right around when the reference database visit
+// entries were created.
+//
+// This update occurs in `updateVisitTimes`.
+const MS_SINCE_SNAPSHOT_TIME =
+  new Date() - new Date("Nov 10, 2022 00:00:00 UTC");
+
+async function setupHistoryFile() {
+  removeHistoryFile();
+  let file = do_get_file(HISTORY_STRANGE_ENTRIES_FILE_PATH);
+  file.copyTo(file.parent, "History.db");
+  await updateVisitTimes();
+}
+
+function removeHistoryFile() {
+  let file = do_get_file(HISTORY_FILE_PATH, true);
+  try {
+    file.remove(false);
+  } catch (ex) {
+    // It is ok if this doesn't exist.
+    if (ex.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+      throw ex;
+    }
+  }
+}
+
+add_setup(async function setup() {
+  registerFakePath("ULibDir", do_get_file("Library/"));
+  await setupHistoryFile();
+  registerCleanupFunction(async () => {
+    await PlacesUtils.history.clear();
+    removeHistoryFile();
+  });
+});
+
+async function updateVisitTimes() {
+  let cocoaSnapshotDelta = MS_SINCE_SNAPSHOT_TIME / 1000;
+  let historyFile = do_get_file(HISTORY_FILE_PATH);
+  let dbConn = await Sqlite.openConnection({ path: historyFile.path });
+
+  await dbConn.execute(
+    "UPDATE history_visits SET visit_time = visit_time + :cocoaSnapshotDelta;",
+    {
+      cocoaSnapshotDelta,
+    }
+  );
+
+  await dbConn.close();
+}
+
+/**
+ * Tests that we can import successfully from Safari when Safari's history
+ * database contains malformed URLs.
+ */
+add_task(async function testHistoryImportStrangeEntries() {
+  await PlacesUtils.history.clear();
+
+  let placesQuery = new PlacesQuery();
+  let emptyHistory = await placesQuery.getHistory();
+  Assert.equal(emptyHistory.size, 0, "Empty history should indeed be empty.");
+
+  const EXPECTED_MIGRATED_SITES = 10;
+  const EXPECTED_MIGRATED_VISTS = 23;
+
+  let historyFile = do_get_file(HISTORY_FILE_PATH);
+  let dbConn = await Sqlite.openConnection({ path: historyFile.path });
+  let [rowCountResult] = await dbConn.execute(
+    "SELECT COUNT(*) FROM history_visits"
+  );
+  Assert.greater(
+    rowCountResult.getResultByName("COUNT(*)"),
+    EXPECTED_MIGRATED_VISTS,
+    "There are more total rows than valid rows"
+  );
+  await dbConn.close();
+
+  let migrator = await MigrationUtils.getMigrator("safari");
+  await promiseMigration(migrator, MigrationUtils.resourceTypes.HISTORY);
+  let migratedHistory = await placesQuery.getHistory({ sortBy: "site" });
+  let siteCount = migratedHistory.size;
+  let visitCount = 0;
+  for (let [, visits] of migratedHistory) {
+    visitCount += visits.length;
+  }
+  Assert.equal(
+    siteCount,
+    EXPECTED_MIGRATED_SITES,
+    "Should have migrated all valid history sites"
+  );
+  Assert.equal(
+    visitCount,
+    EXPECTED_MIGRATED_VISTS,
+    "Should have migrated all valid history visits"
+  );
+
+  placesQuery.close();
+});
diff --git a/browser/components/migration/tests/unit/test_Safari_permissions.js b/browser/components/migration/tests/unit/test_Safari_permissions.js
new file mode 100644
index 0000000000..eaa6c7788e
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_Safari_permissions.js
@@ -0,0 +1,145 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that if the migrator does not have the permission to
+ * read from the Safari data directory, that it can request
+ * permission to read from it, if the system allows.
+ */
+
+const { SafariProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/SafariProfileMigrator.sys.mjs"
+);
+
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+const { MockFilePicker } = ChromeUtils.importESModule(
+  "resource://testing-common/MockFilePicker.sys.mjs"
+);
+
+let gDataDir;
+
+add_setup(async () => {
+  let tempDir = do_get_tempdir();
+  gDataDir = PathUtils.join(tempDir.path, "Safari");
+  await IOUtils.makeDirectory(gDataDir);
+
+  registerFakePath("ULibDir", tempDir);
+
+  MockFilePicker.init(globalThis);
+  registerCleanupFunction(() => {
+    MockFilePicker.cleanup();
+  });
+});
+
+/**
+ * Tests that canGetPermissions will return false if the platform does
+ * not allow for folder selection in the native file picker, and returns
+ * the data path otherwise.
+ */
+add_task(async function test_canGetPermissions() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new SafariProfileMigrator();
+  // Not being able to get a folder picker is not a problem on macOS, but
+  // we'll test that case anyways.
+  let canGetPermissionsStub = sandbox
+    .stub(MigrationUtils, "canGetPermissionsOnPlatform")
+    .resolves(false);
+
+  Assert.ok(
+    !(await migrator.canGetPermissions()),
+    "Should not be able to get permissions."
+  );
+
+  canGetPermissionsStub.resolves(true);
+
+  Assert.equal(
+    await migrator.canGetPermissions(),
+    gDataDir,
+    "Should be able to get the permissions path."
+  );
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that getPermissions will show the native file picker in a
+ * loop until either the user cancels or selects a folder that grants
+ * read permissions to the data directory.
+ */
+add_task(async function test_getPermissions() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let migrator = new SafariProfileMigrator();
+  sandbox.stub(MigrationUtils, "canGetPermissionsOnPlatform").resolves(true);
+  let hasPermissionsStub = sandbox
+    .stub(migrator, "hasPermissions")
+    .resolves(false);
+
+  Assert.equal(
+    await migrator.canGetPermissions(),
+    gDataDir,
+    "Should be able to get the permissions path."
+  );
+
+  let filePickerSeenCount = 0;
+
+  let filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      MockFilePicker.useDirectory([gDataDir]);
+      filePickerSeenCount++;
+      if (filePickerSeenCount > 3) {
+        Assert.ok(true, "File picker looped 3 times.");
+        hasPermissionsStub.resolves(true);
+        resolve();
+      }
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnOK;
+
+  // This is a little awkward, but we need to ensure that the
+  // filePickerShownPromise resolves first before we await
+  // the getPermissionsPromise in order to get the correct
+  // filePickerSeenCount.
+  let getPermissionsPromise = migrator.getPermissions();
+  await filePickerShownPromise;
+  Assert.ok(
+    await getPermissionsPromise,
+    "Should report that we got permissions."
+  );
+
+  // Make sure that the user can also hit "cancel" and that we
+  // file picker loop.
+
+  hasPermissionsStub.resolves(false);
+
+  filePickerSeenCount = 0;
+  filePickerShownPromise = new Promise(resolve => {
+    MockFilePicker.showCallback = () => {
+      Assert.ok(true, "Filepicker shown.");
+      filePickerSeenCount++;
+      Assert.equal(filePickerSeenCount, 1, "Saw the picker once.");
+      resolve();
+    };
+  });
+  MockFilePicker.returnValue = MockFilePicker.returnCancel;
+  Assert.ok(
+    !(await migrator.getPermissions()),
+    "Should report that we didn't get permissions."
+  );
+  await filePickerShownPromise;
+
+  sandbox.restore();
+});
diff --git a/browser/components/migration/tests/unit/test_fx_telemetry.js b/browser/components/migration/tests/unit/test_fx_telemetry.js
new file mode 100644
index 0000000000..68e34beab3
--- /dev/null
+++ b/browser/components/migration/tests/unit/test_fx_telemetry.js
@@ -0,0 +1,436 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+const { FirefoxProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/FirefoxProfileMigrator.sys.mjs"
+);
+const { InternalTestingProfileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/InternalTestingProfileMigrator.sys.mjs"
+);
+const { LoginCSVImport } = ChromeUtils.importESModule(
+  "resource://gre/modules/LoginCSVImport.sys.mjs"
+);
+const { PasswordFileMigrator } = ChromeUtils.importESModule(
+  "resource:///modules/FileMigrators.sys.mjs"
+);
+const { sinon } = ChromeUtils.importESModule(
+  "resource://testing-common/Sinon.sys.mjs"
+);
+
+// These preferences are set to true anytime MigratorBase.migrate
+// successfully completes a migration of their type.
+const BOOKMARKS_PREF = "browser.migrate.interactions.bookmarks";
+const CSV_PASSWORDS_PREF = "browser.migrate.interactions.csvpasswords";
+const HISTORY_PREF = "browser.migrate.interactions.history";
+const PASSWORDS_PREF = "browser.migrate.interactions.passwords";
+
+function readFile(file) {
+  let stream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  stream.init(file, -1, -1, Ci.nsIFileInputStream.CLOSE_ON_EOF);
+
+  let sis = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(
+    Ci.nsIScriptableInputStream
+  );
+  sis.init(stream);
+  let contents = sis.read(file.fileSize);
+  sis.close();
+  return contents;
+}
+
+function checkDirectoryContains(dir, files) {
+  print("checking " + dir.path + " - should contain " + Object.keys(files));
+  let seen = new Set();
+  for (let file of dir.directoryEntries) {
+    print("found file: " + file.path);
+    Assert.ok(file.leafName in files, file.leafName + " exists, but shouldn't");
+
+    let expectedContents = files[file.leafName];
+    if (typeof expectedContents != "string") {
+      // it's a subdir - recurse!
+      Assert.ok(file.isDirectory(), "should be a subdir");
+      let newDir = dir.clone();
+      newDir.append(file.leafName);
+      checkDirectoryContains(newDir, expectedContents);
+    } else {
+      Assert.ok(!file.isDirectory(), "should be a regular file");
+      let contents = readFile(file);
+      Assert.equal(contents, expectedContents);
+    }
+    seen.add(file.leafName);
+  }
+  let missing = [];
+  for (let x in files) {
+    if (!seen.has(x)) {
+      missing.push(x);
+    }
+  }
+  Assert.deepEqual(missing, [], "no missing files in " + dir.path);
+}
+
+function getTestDirs() {
+  // we make a directory structure in a temp dir which mirrors what we are
+  // testing.
+  let tempDir = do_get_tempdir();
+  let srcDir = tempDir.clone();
+  srcDir.append("test_source_dir");
+  srcDir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);
+
+  let targetDir = tempDir.clone();
+  targetDir.append("test_target_dir");
+  targetDir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);
+
+  // no need to cleanup these dirs - the xpcshell harness will do it for us.
+  return [srcDir, targetDir];
+}
+
+function writeToFile(dir, leafName, contents) {
+  let file = dir.clone();
+  file.append(leafName);
+
+  let outputStream = FileUtils.openFileOutputStream(file);
+  outputStream.write(contents, contents.length);
+  outputStream.close();
+}
+
+function createSubDir(dir, subDirName) {
+  let subDir = dir.clone();
+  subDir.append(subDirName);
+  subDir.create(Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);
+  return subDir;
+}
+
+async function promiseMigrator(name, srcDir, targetDir) {
+  // As the FirefoxProfileMigrator is a startup-only migrator, we import its
+  // module and instantiate it directly rather than going through MigrationUtils,
+  // to bypass that availability check.
+  let migrator = new FirefoxProfileMigrator();
+  let migrators = migrator._getResourcesInternal(srcDir, targetDir);
+  for (let m of migrators) {
+    if (m.name == name) {
+      return new Promise(resolve => m.migrate(resolve));
+    }
+  }
+  throw new Error("failed to find the " + name + " migrator");
+}
+
+function promiseTelemetryMigrator(srcDir, targetDir) {
+  return promiseMigrator("telemetry", srcDir, targetDir);
+}
+
+add_task(async function test_empty() {
+  let [srcDir, targetDir] = getTestDirs();
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true with empty directories");
+  // check both are empty
+  checkDirectoryContains(srcDir, {});
+  checkDirectoryContains(targetDir, {});
+});
+
+add_task(async function test_migrate_files() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Set up datareporting files, some to copy, some not.
+  let stateContent = JSON.stringify({
+    clientId: "68d5474e-19dc-45c1-8e9a-81fca592707c",
+  });
+  let sessionStateContent = "foobar 5432";
+  let subDir = createSubDir(srcDir, "datareporting");
+  writeToFile(subDir, "state.json", stateContent);
+  writeToFile(subDir, "session-state.json", sessionStateContent);
+  writeToFile(subDir, "other.file", "do not copy");
+
+  let archived = createSubDir(subDir, "archived");
+  writeToFile(archived, "other.file", "do not copy");
+
+  // Set up FHR files, they should not be copied.
+  writeToFile(srcDir, "healthreport.sqlite", "do not copy");
+  writeToFile(srcDir, "healthreport.sqlite-wal", "do not copy");
+  subDir = createSubDir(srcDir, "healthreport");
+  writeToFile(subDir, "state.json", "do not copy");
+  writeToFile(subDir, "other.file", "do not copy");
+
+  // Perform migration.
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(
+    ok,
+    "callback should have been true with important telemetry files copied"
+  );
+
+  checkDirectoryContains(targetDir, {
+    datareporting: {
+      "state.json": stateContent,
+      "session-state.json": sessionStateContent,
+    },
+  });
+});
+
+add_task(async function test_datareporting_not_dir() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  writeToFile(srcDir, "datareporting", "I'm a file but should be a directory");
+
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(
+    ok,
+    "callback should have been true even though the directory was a file"
+  );
+
+  checkDirectoryContains(targetDir, {});
+});
+
+add_task(async function test_datareporting_empty() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Migrate with an empty 'datareporting' subdir.
+  createSubDir(srcDir, "datareporting");
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  // We should end up with no migrated files.
+  checkDirectoryContains(targetDir, {
+    datareporting: {},
+  });
+});
+
+add_task(async function test_healthreport_empty() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Migrate with no 'datareporting' and an empty 'healthreport' subdir.
+  createSubDir(srcDir, "healthreport");
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  // We should end up with no migrated files.
+  checkDirectoryContains(targetDir, {});
+});
+
+add_task(async function test_datareporting_many() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Create some datareporting files.
+  let subDir = createSubDir(srcDir, "datareporting");
+  let shouldBeCopied = "should be copied";
+  writeToFile(subDir, "state.json", shouldBeCopied);
+  writeToFile(subDir, "session-state.json", shouldBeCopied);
+  writeToFile(subDir, "something.else", "should not");
+  createSubDir(subDir, "emptyDir");
+
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  checkDirectoryContains(targetDir, {
+    datareporting: {
+      "state.json": shouldBeCopied,
+      "session-state.json": shouldBeCopied,
+    },
+  });
+});
+
+add_task(async function test_no_session_state() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Check that migration still works properly if we only have state.json.
+  let subDir = createSubDir(srcDir, "datareporting");
+  let stateContent = "abcd984";
+  writeToFile(subDir, "state.json", stateContent);
+
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  checkDirectoryContains(targetDir, {
+    datareporting: {
+      "state.json": stateContent,
+    },
+  });
+});
+
+add_task(async function test_no_state() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // Check that migration still works properly if we only have session-state.json.
+  let subDir = createSubDir(srcDir, "datareporting");
+  let sessionStateContent = "abcd512";
+  writeToFile(subDir, "session-state.json", sessionStateContent);
+
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  checkDirectoryContains(targetDir, {
+    datareporting: {
+      "session-state.json": sessionStateContent,
+    },
+  });
+});
+
+add_task(async function test_times_migration() {
+  let [srcDir, targetDir] = getTestDirs();
+
+  // create a times.json in the source directory.
+  let contents = JSON.stringify({ created: 1234 });
+  writeToFile(srcDir, "times.json", contents);
+
+  let earliest = Date.now();
+  let ok = await promiseMigrator("times", srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+  let latest = Date.now();
+
+  let timesFile = targetDir.clone();
+  timesFile.append("times.json");
+
+  let raw = readFile(timesFile);
+  let times = JSON.parse(raw);
+  Assert.ok(times.reset >= earliest && times.reset <= latest);
+  // and it should have left the creation time alone.
+  Assert.equal(times.created, 1234);
+});
+
+/**
+ * Tests that when importing bookmarks, history, or passwords, we
+ * set interaction prefs. These preferences are sent using
+ * TelemetryEnvironment.sys.mjs.
+ */
+add_task(async function test_interaction_telemetry() {
+  let testingMigrator = await MigrationUtils.getMigrator(
+    InternalTestingProfileMigrator.key
+  );
+
+  Services.prefs.clearUserPref(BOOKMARKS_PREF);
+  Services.prefs.clearUserPref(HISTORY_PREF);
+  Services.prefs.clearUserPref(PASSWORDS_PREF);
+
+  // Ensure that these prefs start false.
+  Assert.ok(!Services.prefs.getBoolPref(BOOKMARKS_PREF));
+  Assert.ok(!Services.prefs.getBoolPref(HISTORY_PREF));
+  Assert.ok(!Services.prefs.getBoolPref(PASSWORDS_PREF));
+
+  await testingMigrator.migrate(
+    MigrationUtils.resourceTypes.BOOKMARKS,
+    false,
+    InternalTestingProfileMigrator.testProfile
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(BOOKMARKS_PREF),
+    "Bookmarks pref should have been set."
+  );
+  Assert.ok(!Services.prefs.getBoolPref(HISTORY_PREF));
+  Assert.ok(!Services.prefs.getBoolPref(PASSWORDS_PREF));
+
+  await testingMigrator.migrate(
+    MigrationUtils.resourceTypes.HISTORY,
+    false,
+    InternalTestingProfileMigrator.testProfile
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(BOOKMARKS_PREF),
+    "Bookmarks pref should have been set."
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(HISTORY_PREF),
+    "History pref should have been set."
+  );
+  Assert.ok(!Services.prefs.getBoolPref(PASSWORDS_PREF));
+
+  await testingMigrator.migrate(
+    MigrationUtils.resourceTypes.PASSWORDS,
+    false,
+    InternalTestingProfileMigrator.testProfile
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(BOOKMARKS_PREF),
+    "Bookmarks pref should have been set."
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(HISTORY_PREF),
+    "History pref should have been set."
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(PASSWORDS_PREF),
+    "Passwords pref should have been set."
+  );
+
+  // Now make sure that we still record these if we migrate a
+  // series of resources at the same time.
+  Services.prefs.clearUserPref(BOOKMARKS_PREF);
+  Services.prefs.clearUserPref(HISTORY_PREF);
+  Services.prefs.clearUserPref(PASSWORDS_PREF);
+
+  await testingMigrator.migrate(
+    MigrationUtils.resourceTypes.ALL,
+    false,
+    InternalTestingProfileMigrator.testProfile
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(BOOKMARKS_PREF),
+    "Bookmarks pref should have been set."
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(HISTORY_PREF),
+    "History pref should have been set."
+  );
+  Assert.ok(
+    Services.prefs.getBoolPref(PASSWORDS_PREF),
+    "Passwords pref should have been set."
+  );
+});
+
+/**
+ * Tests that when importing passwords from a CSV file using the
+ * migration wizard, we set an interaction pref. This preference
+ * is sent using TelemetryEnvironment.sys.mjs.
+ */
+add_task(async function test_csv_password_interaction_telemetry() {
+  let sandbox = sinon.createSandbox();
+  registerCleanupFunction(() => {
+    sandbox.restore();
+  });
+
+  let testingMigrator = new PasswordFileMigrator();
+
+  Services.prefs.clearUserPref(CSV_PASSWORDS_PREF);
+  Assert.ok(!Services.prefs.getBoolPref(CSV_PASSWORDS_PREF));
+
+  sandbox.stub(LoginCSVImport, "importFromCSV").resolves([]);
+  await testingMigrator.migrate("some/fake/path.csv");
+
+  Assert.ok(
+    Services.prefs.getBoolPref(CSV_PASSWORDS_PREF),
+    "CSV import pref should have been set."
+  );
+
+  sandbox.restore();
+});
+
+/**
+ * Tests that interaction preferences used for TelemetryEnvironment are
+ * persisted across profile resets.
+ */
+add_task(async function test_interaction_telemetry_persist_across_reset() {
+  const PREFS = `
+user_pref("${BOOKMARKS_PREF}", true);
+user_pref("${CSV_PASSWORDS_PREF}", true);
+user_pref("${HISTORY_PREF}", true);
+user_pref("${PASSWORDS_PREF}", true);
+  `;
+
+  let [srcDir, targetDir] = getTestDirs();
+  writeToFile(srcDir, "prefs.js", PREFS);
+
+  let ok = await promiseTelemetryMigrator(srcDir, targetDir);
+  Assert.ok(ok, "callback should have been true");
+
+  let prefsPath = PathUtils.join(targetDir.path, "prefs.js");
+  Assert.ok(await IOUtils.exists(prefsPath), "Prefs should have been written.");
+  let writtenPrefsString = await IOUtils.readUTF8(prefsPath);
+  for (let prefKey of [
+    BOOKMARKS_PREF,
+    CSV_PASSWORDS_PREF,
+    HISTORY_PREF,
+    PASSWORDS_PREF,
+  ]) {
+    const EXPECTED = `user_pref("${prefKey}", true);`;
+    Assert.ok(writtenPrefsString.includes(EXPECTED), "Found persisted pref.");
+  }
+});
diff --git a/browser/components/migration/tests/unit/xpcshell.toml b/browser/components/migration/tests/unit/xpcshell.toml
new file mode 100644
index 0000000000..b599a64362
--- /dev/null
+++ b/browser/components/migration/tests/unit/xpcshell.toml
@@ -0,0 +1,95 @@
+[DEFAULT]
+head = "head_migration.js"
+tags = "condprof"
+firefox-appdir = "browser"
+skip-if = ["os == 'android'"] # bug 1730213
+prefs = ["browser.migrate.showBookmarksToolbarAfterMigration=true"]
+support-files = [
+  "Library/**",
+  "AppData/**",
+  "bookmarks.exported.html",
+  "bookmarks.exported.json",
+  "bookmarks.invalid.html",
+]
+
+["test_360seMigrationUtils.js"]
+run-if = ["os == 'win'"]
+
+["test_360se_bookmarks.js"]
+run-if = ["os == 'win'"]
+
+["test_BookmarksFileMigrator.js"]
+
+["test_ChromeMigrationUtils.js"]
+
+["test_ChromeMigrationUtils_path.js"]
+
+["test_ChromeMigrationUtils_path_chromium_snap.js"]
+run-if = ["os == 'linux'"]
+
+["test_Chrome_bookmarks.js"]
+
+["test_Chrome_corrupt_history.js"]
+
+["test_Chrome_credit_cards.js"]
+skip-if = [
+  "os == 'linux'",
+  "os == 'android'",
+  "condprof", # bug 1769154 - not realistic for condprof
+]
+
+["test_Chrome_extensions.js"]
+
+["test_Chrome_formdata.js"]
+
+["test_Chrome_history.js"]
+skip-if = ["os != 'mac'"] # Relies on ULibDir
+
+["test_Chrome_passwords.js"]
+skip-if = [
+  "os == 'linux'",
+  "os == 'android'",
+  "condprof", # bug 1769154 - not realistic for condprof
+]
+
+["test_Chrome_passwords_emptySource.js"]
+skip-if = [
+  "os == 'linux'",
+  "os == 'android'",
+  "condprof", # bug 1769154 - not realistic for condprof
+]
+support-files = ["LibraryWithNoData/**"]
+
+["test_Chrome_permissions.js"]
+
+["test_Edge_db_migration.js"]
+run-if = ["os == 'win'"]
+
+["test_Edge_registry_migration.js"]
+run-if = ["os == 'win'"]
+
+["test_IE_bookmarks.js"]
+run-if = ["os == 'win' && bits == 64"] # bug 1392396
+
+["test_IE_history.js"]
+run-if = ["os == 'win'"]
+skip-if = ["os == 'win' && msix"] # https://bugzilla.mozilla.org/show_bug.cgi?id=1807928
+
+["test_MigrationUtils_timedRetry.js"]
+skip-if = ["os == 'mac' && !debug"] #Bug 1558330
+
+["test_PasswordFileMigrator.js"]
+
+["test_Safari_bookmarks.js"]
+run-if = ["os == 'mac'"]
+
+["test_Safari_history.js"]
+run-if = ["os == 'mac'"]
+
+["test_Safari_history_strange_entries.js"]
+run-if = ["os == 'mac'"]
+
+["test_Safari_permissions.js"]
+run-if = ["os == 'mac'"]
+
+["test_fx_telemetry.js"]