feat: Replace zen's tab unloader with firefox's one. Also added more tests, b=(no-bug), c=common, tabs, tests, glance

l10n

@@ -1 +1 @@
-Subproject commit 4d0df55d514b54626faa1f2fc06eb020feeb7f6d
+Subproject commit 644474b8c92e306288d835698eb6714081a650d8

src/browser/app/profile/features.inc

@@ -97,10 +97,6 @@ pref('zen.keyboard.shortcuts.disable-mainkeyset-clear', false); // for debugging
 
 pref('zen.themes.updated-value-observer', false);
 
-pref('zen.tab-unloader.enabled', true);
-pref('zen.tab-unloader.timeout-minutes', 40);
-pref('zen.tab-unloader.excluded-urls', "example.com,example.org");
-
 pref('zen.pinned-tab-manager.debug', false);
 pref('zen.pinned-tab-manager.restore-pinned-tabs-to-pinned-url', false);
 pref('zen.pinned-tab-manager.close-shortcut-behavior', 'reset-unload-switch');

src/browser/base/content/browser-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
-index 6d664917a5a3bb1cea8a747e42e8bc0065ec999e..7fe04b426a8dd3c8dbb71065da047f8f48b8e84c 100644
+index 6d664917a5a3bb1cea8a747e42e8bc0065ec999e..5059293ebfa29d646455b7a3505bd6eae408ba64 100644
 --- a/browser/base/content/browser.js
 +++ b/browser/base/content/browser.js
 @@ -33,6 +33,7 @@ ChromeUtils.defineESModuleGetters(this, {
@@ -10,19 +10,18 @@ index 6d664917a5a3bb1cea8a747e42e8bc0065ec999e..7fe04b426a8dd3c8dbb71065da047f8f
    DevToolsSocketStatus:
      "resource://devtools/shared/security/DevToolsSocketStatus.sys.mjs",
    DownloadUtils: "resource://gre/modules/DownloadUtils.sys.mjs",
-@@ -2340,6 +2341,11 @@ var XULBrowserWindow = {
+@@ -2340,6 +2341,10 @@ var XULBrowserWindow = {
      AboutReaderParent.updateReaderButton(gBrowser.selectedBrowser);
      TranslationsParent.onLocationChange(gBrowser.selectedBrowser);
  
 +    gZenViewSplitter.onLocationChange(gBrowser.selectedBrowser);
 +    gZenWorkspaces.onLocationChange(gBrowser.selectedBrowser);
-+    gZenTabUnloader.onLocationChange(gBrowser.selectedBrowser);
 +    gZenPinnedTabManager.onLocationChange(gBrowser.selectedBrowser);
 +
      PictureInPicture.updateUrlbarToggle(gBrowser.selectedBrowser);
  
      if (!gMultiProcessBrowser) {
-@@ -4816,7 +4822,7 @@ function switchToTabHavingURI(
+@@ -4816,7 +4821,7 @@ function switchToTabHavingURI(
        ignoreQueryString || replaceQueryString,
        ignoreFragmentWhenComparing
      );
@@ -31,7 +30,7 @@ index 6d664917a5a3bb1cea8a747e42e8bc0065ec999e..7fe04b426a8dd3c8dbb71065da047f8f
      for (let i = 0; i < browsers.length; i++) {
        let browser = browsers[i];
        let browserCompare = cleanURL(
-@@ -4859,7 +4865,7 @@ function switchToTabHavingURI(
+@@ -4859,7 +4864,7 @@ function switchToTabHavingURI(
          }
  
          if (!doAdopt) {

src/browser/base/content/zen-assets.inc.xhtml

@@ -34,7 +34,6 @@
 <script src="chrome://browser/content/zen-components/ZenThemesCommon.mjs"></script>
 <script src="chrome://browser/content/zen-components/ZenThemesImporter.mjs"></script>
 <script src="chrome://browser/content/zen-components/ZenCompactMode.mjs"></script>
-<script src="chrome://browser/content/zen-components/ZenTabUnloader.mjs"></script>
 <script src="chrome://browser/content/zen-components/ZenPinnedTabsStorage.mjs"></script>
 <script src="chrome://browser/content/zen-components/ZenWorkspacesStorage.mjs"></script>
 <script src="chrome://browser/content/zen-components/ZenPinnedTabManager.mjs"></script>

src/browser/base/content/zen-assets.jar.inc.mn

@@ -50,7 +50,6 @@
 
         content/browser/zen-components/ZenKeyboardShortcuts.mjs                 (../../zen/kbs/ZenKeyboardShortcuts.mjs)
 
-        content/browser/zen-components/ZenTabUnloader.mjs                       (../../zen/tabs/ZenTabUnloader.mjs)
         content/browser/zen-components/ZenPinnedTabsStorage.mjs                 (../../zen/tabs/ZenPinnedTabsStorage.mjs)
         content/browser/zen-components/ZenPinnedTabManager.mjs                  (../../zen/tabs/ZenPinnedTabManager.mjs)
 *       content/browser/zen-styles/zen-tabs.css                                 (../../zen/tabs/zen-tabs.css)

src/browser/base/content/zen-keysets.inc.xhtml

@@ -43,10 +43,6 @@
 
   <command id="cmd_zenCopyCurrentURL" />
   <command id="cmd_zenCopyCurrentURLMarkdown" />
-
-  <command id="cmd_zenUnloadTab" />
-  <command id="cmd_zenPreventUnloadTab" />
-  <command id="cmd_zenIgnoreUnloadTab" />
 </commandset>
 
 <keyset id="zenKeyset"></keyset>

src/browser/components/preferences/zenTabsManagement.inc.xhtml

@@ -37,18 +37,7 @@
 
       <checkbox id="zenTabsUnloadActivate"
             data-l10n-id="zen-tabs-unloader-enabled"
-            preference="zen.tab-unloader.enabled"/>
+            preference="browser.tabs.unloadOnLowMemory"/>
-
-
-      <label><html:h2 data-l10n-id="zen-tabs-unloader-unload-delay"/></label>
-      <hbox id="zenTabsUnloadDelayContainer">
-            <description class="description-deemphasized" data-l10n-id="zen-tabs-unloader-unload-delay-description" />
-            <html:input id="zenTabsUnloadDelay"
-                  type="number"
-                  min="1"
-                  max="1000"
-                  preference="zen.tab-unloader.timeout-minutes"/>
-      </hbox>
 </groupbox>
 
 <hbox id="zenPinnedTabsManagerCategory"

src/browser/components/tabbrowser/TabUnloader-sys-mjs.patch

@@ -0,0 +1,13 @@
+diff --git a/browser/components/tabbrowser/TabUnloader.sys.mjs b/browser/components/tabbrowser/TabUnloader.sys.mjs
+index 44846cc902fd3fc17d12be38ac9abccb47a12f23..c715c7cf47486066b3fd6f92bf78bc8a720759bc 100644
+--- a/browser/components/tabbrowser/TabUnloader.sys.mjs
++++ b/browser/components/tabbrowser/TabUnloader.sys.mjs
+@@ -52,7 +52,7 @@ let CRITERIA_WEIGHT = 1;
+  */
+ let DefaultTabUnloaderMethods = {
+   isNonDiscardable(tab, weight) {
+-    if (tab.undiscardable || tab.selected) {
++    if (tab.undiscardable || tab.selected || tab.zenModeActive) {
+       return weight;
+     }
+ 

src/browser/components/tabbrowser/content/tabbrowser-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabbrowser.js b/browser/components/tabbrowser/content/tabbrowser.js
-index d5aa64842a35c6697263c63fd3a0571b64b01344..bcae8a44593d7b3e5efdd999b4c2f5bcac221632 100644
+index d5aa64842a35c6697263c63fd3a0571b64b01344..6943dc7f1d3d95ab1da315cbdbda0b032cf200f1 100644
 --- a/browser/components/tabbrowser/content/tabbrowser.js
 +++ b/browser/components/tabbrowser/content/tabbrowser.js
 @@ -413,11 +413,41 @@
@@ -491,17 +491,6 @@ index d5aa64842a35c6697263c63fd3a0571b64b01344..bcae8a44593d7b3e5efdd999b4c2f5bc
        if (!this._windowIsClosing) {
          if (wasPinned) {
            this.tabContainer._positionPinnedTabs();
-@@ -5141,8 +5266,8 @@
-       return closedCount;
-     }
- 
--    async explicitUnloadTabs(tabs) {
--      let unloadBlocked = await this.runBeforeUnloadForTabs(tabs);
-+    async explicitUnloadTabs(tabs, skipPermitUnload = false) {
-+      let unloadBlocked = skipPermitUnload ? false : await this.runBeforeUnloadForTabs(tabs);
-       if (unloadBlocked) {
-         return;
-       }
 @@ -5230,6 +5355,7 @@
        }
  

src/browser/themes/shared/zen-icons/icons.css

@@ -1051,8 +1051,7 @@ menuitem[id='placesContext_new:separator'] {
   --menu-image: url('close-all.svg');
 }
 
-#context_zenUnloadTab,
+#context_unloadTab,
-#context_zenUnloadWebPanel,
 #context_zenTabActions {
   --menu-image: url('close-all.svg');
 }

src/zen/common/ZenUIMigration.mjs

@@ -6,7 +6,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
 
 class ZenUIMigration {
   PREF_NAME = 'zen.migration.version';
-  MIGRATION_VERSION = 3;
+  MIGRATION_VERSION = 4;
 
   init(isNewProfile, win) {
     if (!isNewProfile) {
@@ -33,6 +33,9 @@ class ZenUIMigration {
     if (this._migrationVersion < 3) {
       this._migrateV3(win);
     }
+    if (this._migrationVersion < 4) {
+      this._migrateV4(win);
+    }
   }
 
   clearVariables() {
@@ -82,6 +85,13 @@ class ZenUIMigration {
       win.CustomizableUI.removeWidgetFromArea(widgetId);
     }
   }
+
+  _migrateV4(win) {
+    Services.prefs.setBoolPref(
+      'browser.tabs.unloadOnLowMemory',
+      Services.prefs.getBoolPref('zen.tab-unloader.enabled', true)
+    );
+  }
 }
 
 export var gZenUIMigration = new ZenUIMigration();

src/zen/common/zen-sets.js

@@ -88,15 +88,6 @@ document.addEventListener(
           case 'cmd_zenRemoveFromEssentials':
             gZenPinnedTabManager.removeEssentials();
             break;
-          case 'cmd_zenUnloadTab':
-            gZenTabUnloader.unloadTab();
-            break;
-          case 'cmd_zenPreventUnloadTab':
-            gZenTabUnloader.preventUnloadTab();
-            break;
-          case 'cmd_zenIgnoreUnloadTab':
-            gZenTabUnloader.ignoreUnloadTab();
-            break;
           default:
             if (event.target.id.startsWith('cmd_zenWorkspaceSwitch')) {
               const index = parseInt(event.target.id.replace('cmd_zenWorkspaceSwitch', ''), 10) - 1;

src/zen/tabs/ZenPinnedTabManager.mjs

@@ -397,10 +397,10 @@
       );
     }
 
-    _onTabClick(e) {
+    async _onTabClick(e) {
       const tab = e.target?.closest('tab');
       if (e.button === 1 && tab) {
-        this._onCloseTabShortcut(e, tab);
+        await this._onCloseTabShortcut(e, tab);
       }
     }
 
@@ -533,7 +533,7 @@
       }
     }
 
-    _onCloseTabShortcut(
+    async _onCloseTabShortcut(
       event,
       selectedTab = gBrowser.selectedTab,
       behavior = lazy.zenPinnedTabCloseShortcutBehavior
@@ -554,22 +554,17 @@
         case 'unload-switch':
         case 'reset-switch':
         case 'switch':
-          let { permitUnload } = selectedTab.linkedBrowser?.permitUnload();
-          if (!permitUnload) {
-            return;
-          }
-          this._handleTabSwitch(selectedTab);
-          if (behavior.includes('reset')) {
-            this._resetTabToStoredState(selectedTab);
-          }
           if (behavior.includes('unload')) {
             if (selectedTab.hasAttribute('glance-id')) {
               break;
             }
-            // Do not unload about:* pages
+            await gBrowser.explicitUnloadTabs([selectedTab]);
-            if (!selectedTab.linkedBrowser?.currentURI.spec.startsWith('about:')) {
+          }
-              gZenTabUnloader.explicitUnloadTabs([selectedTab], { permitUnload });
+          if (selectedTab.selected) {
-            }
+            this._handleTabSwitch(selectedTab);
+          }
+          if (behavior.includes('reset')) {
+            this._resetTabToStoredState(selectedTab);
           }
           break;
         case 'reset':

src/zen/tabs/ZenTabUnloader.mjs

@@ -1,310 +0,0 @@
-{
-  const lazy = {};
-
-  XPCOMUtils.defineLazyPreferenceGetter(
-    lazy,
-    'zenTabUnloaderEnabled',
-    'zen.tab-unloader.enabled',
-    false
-  );
-
-  XPCOMUtils.defineLazyPreferenceGetter(
-    lazy,
-    'zenTabUnloaderTimeout',
-    'zen.tab-unloader.timeout-minutes',
-    20
-  );
-
-  XPCOMUtils.defineLazyPreferenceGetter(
-    lazy,
-    'zenTabUnloaderExcludedUrls',
-    'zen.tab-unloader.excluded-urls',
-    ''
-  );
-
-  const ZEN_TAB_UNLOADER_DEFAULT_EXCLUDED_URLS = [
-    '^about:',
-    '^chrome:',
-    '^devtools:',
-    '^file:',
-    '^resource:',
-    '^view-source:',
-    '^view-image:',
-  ];
-
-  class ZenTabsObserver {
-    static ALL_EVENTS = [
-      'TabAttrModified',
-      'TabPinned',
-      'TabUnpinned',
-      'TabShow',
-      'TabHide',
-      'TabOpen',
-      'TabClose',
-      'TabSelect',
-      'TabMultiSelect',
-    ];
-
-    #listeners = [];
-
-    constructor() {
-      this.#listenAllEvents();
-    }
-
-    #listenAllEvents() {
-      const eventListener = this.#eventListener.bind(this);
-      for (const event of ZenTabsObserver.ALL_EVENTS) {
-        window.addEventListener(event, eventListener);
-      }
-      window.addEventListener('unload', () => {
-        for (const event of ZenTabsObserver.ALL_EVENTS) {
-          window.removeEventListener(event, eventListener);
-        }
-      });
-    }
-
-    #eventListener(event) {
-      for (const listener of this.#listeners) {
-        listener(event.type, event);
-      }
-    }
-
-    addTabsListener(listener) {
-      this.#listeners.push(listener);
-    }
-  }
-
-  class ZenTabsIntervalUnloader {
-    static INTERVAL = 1000 * 60; // 1 minute
-
-    interval = null;
-    /** @type {ZenTabUnloader} */
-    unloader = null;
-
-    constructor(unloader) {
-      this.unloader = unloader;
-      this.interval = setInterval(
-        this.intervalListener.bind(this),
-        ZenTabsIntervalUnloader.INTERVAL
-      );
-    }
-
-    intervalListener() {
-      if (!lazy.zenTabUnloaderEnabled) {
-        return;
-      }
-      const currentTimestamp = Date.now();
-      const tabs = gZenWorkspaces.allStoredTabs;
-      for (let i = 0; i < tabs.length; i++) {
-        const tab = tabs[i];
-        if (this.unloader.canUnloadTab(tab, currentTimestamp)) {
-          this.unloader.unload(tab);
-        }
-      }
-    }
-  }
-
-  class ZenTabUnloader extends ZenDOMOperatedFeature {
-    static ACTIVITY_MODIFIERS = ['muted', 'soundplaying', 'label', 'attention'];
-
-    #excludedUrls = [];
-    #compiledExcludedUrls = [];
-    #lastCheckedUrlTimestamp = 0;
-
-    constructor() {
-      super();
-
-      this.#excludedUrls = this.lazyExcludeUrls;
-      if (!lazy.zenTabUnloaderEnabled) {
-        return;
-      }
-      this.intervalUnloader = new ZenTabsIntervalUnloader(this);
-    }
-
-    init() {
-      if (!lazy.zenTabUnloaderEnabled) {
-        return;
-      }
-      this.observer = new ZenTabsObserver();
-      this.observer.addTabsListener(this.onTabEvent.bind(this));
-    }
-
-    onTabEvent(action, event) {
-      const tab = event.target;
-      switch (action) {
-        case 'TabPinned':
-        case 'TabUnpinned':
-        case 'TabShow':
-        case 'TabHide':
-          break;
-        case 'TabAttrModified':
-          this.handleTabAttrModified(tab, event);
-          break;
-        case 'TabOpen':
-          this.handleTabOpen(tab);
-          break;
-        case 'TabClose':
-          this.handleTabClose(tab);
-          break;
-        case 'TabSelect':
-        case 'TabMultiSelect':
-          this.updateTabActivity(tab);
-          break;
-        default:
-          console.warn('ZenTabUnloader: Unhandled tab event', action);
-          break;
-      }
-    }
-
-    onLocationChange(browser) {
-      const tab = browser.ownerGlobal.gBrowser.getTabForBrowser(browser);
-      this.updateTabActivity(tab);
-    }
-
-    handleTabClose(tab) {
-      tab.lastActivity = null;
-    }
-
-    handleTabOpen(tab) {
-      this.updateTabActivity(tab);
-    }
-
-    handleTabAttrModified(tab, event) {
-      for (const modifier of ZenTabUnloader.ACTIVITY_MODIFIERS) {
-        if (event.detail.changed.includes(modifier)) {
-          this.updateTabActivity(tab);
-          break;
-        }
-      }
-    }
-
-    updateTabActivity(tab) {
-      const currentTimestamp = Date.now();
-      tab.lastActivity = currentTimestamp;
-    }
-
-    get lazyExcludeUrls() {
-      return [
-        ...ZEN_TAB_UNLOADER_DEFAULT_EXCLUDED_URLS,
-        ...lazy.zenTabUnloaderExcludedUrls.split(',').map((url) => url.trim()),
-      ];
-    }
-
-    arraysEqual(a, b) {
-      if (a === b) return true;
-      if (a == null || b == null) return false;
-      if (a.length !== b.length) return false;
-
-      const currentTimestamp = Date.now();
-      if (currentTimestamp - this.#lastCheckedUrlTimestamp < 5 * 1000) {
-        return true;
-      }
-
-      this.#lastCheckedUrlTimestamp = currentTimestamp;
-      // If you don't care about the order of the elements inside
-      // the array, you should sort both arrays here.
-      // Please note that calling sort on an array will modify that array.
-      // you might want to clone your array first.
-
-      for (let i = 0; i < a.length; ++i) {
-        if (a[i] !== b[i]) return false;
-      }
-      return true;
-    }
-
-    get excludedUrls() {
-      // Check if excludedrls is the same as the pref value
-      const excludedUrls = this.lazyExcludeUrls;
-      if (
-        !this.arraysEqual(this.#excludedUrls, excludedUrls) ||
-        !this.#compiledExcludedUrls.length
-      ) {
-        this.#excludedUrls = excludedUrls;
-        this.#compiledExcludedUrls = excludedUrls.map((url) => new RegExp(url));
-      }
-      return this.#compiledExcludedUrls;
-    }
-
-    unload(tab, skipPermitUnload = false) {
-      gBrowser.explicitUnloadTabs([tab], skipPermitUnload);
-      tab.removeAttribute('linkedpanel');
-    }
-
-    unloadTab() {
-      const tabs = TabContextMenu.contextTab.multiselected
-        ? gBrowser.selectedTabs
-        : [TabContextMenu.contextTab];
-      this.explicitUnloadTabs(tabs);
-    }
-
-    explicitUnloadTabs(tabs, extraArgs = {}) {
-      for (let i = 0; i < tabs.length; i++) {
-        if (this.canUnloadTab(tabs[i], Date.now(), true, extraArgs)) {
-          this.unload(tabs[i], true);
-        }
-      }
-    }
-
-    preventUnloadTab() {
-      const tabs = TabContextMenu.contextTab.multiselected
-        ? gBrowser.selectedTabs
-        : [TabContextMenu.contextTab];
-      for (let i = 0; i < tabs.length; i++) {
-        const tab = tabs[i];
-        tab.zenIgnoreUnload = true;
-      }
-    }
-
-    ignoreUnloadTab() {
-      const tabs = TabContextMenu.contextTab.multiselected
-        ? gBrowser.selectedTabs
-        : [TabContextMenu.contextTab];
-      for (let i = 0; i < tabs.length; i++) {
-        const tab = tabs[i];
-        tab.zenIgnoreUnload = false;
-      }
-    }
-
-    canUnloadTab(tab, currentTimestamp, ignoreTimestamp = false, extraArgs = {}) {
-      if (
-        (tab.pinned && !ignoreTimestamp) ||
-        tab.selected ||
-        (tab.multiselected && !ignoreTimestamp) ||
-        (tab.hasAttribute('busy') && !ignoreTimestamp) ||
-        !tab.linkedPanel ||
-        tab.splitView ||
-        tab.group?.hasAttribute('split-view-group') ||
-        tab.attention ||
-        tab.hasAttribute('glance-id') ||
-        tab.linkedBrowser?.zenModeActive ||
-        (tab.pictureinpicture && !ignoreTimestamp) ||
-        (tab.soundPlaying && !ignoreTimestamp) ||
-        (tab.zenIgnoreUnload && !ignoreTimestamp) ||
-        (this.excludedUrls.some((url) => url.test(tab.linkedBrowser?.currentURI.spec)) &&
-          tab.linkedBrowser?.currentURI.spec !== 'about:blank')
-      ) {
-        return false;
-      }
-      if (ignoreTimestamp) {
-        return this._tabPermitsUnload(tab, extraArgs);
-      }
-      const lastActivity = tab.lastActivity;
-      if (!lastActivity) {
-        return false;
-      }
-      const diff = currentTimestamp - lastActivity;
-      // Check if the tab has been inactive for more than the timeout
-      return (
-        diff > lazy.zenTabUnloaderTimeout * 60 * 1000 && this._tabPermitsUnload(tab, extraArgs)
-      );
-    }
-
-    _tabPermitsUnload(tab, extraArgs) {
-      return typeof extraArgs.permitUnload === 'undefined'
-        ? tab.linkedBrowser?.permitUnload()?.permitUnload
-        : extraArgs.permitUnload;
-    }
-  }
-
-  window.gZenTabUnloader = new ZenTabUnloader();
-}

src/zen/tests/glance/browser.toml

@@ -8,3 +8,4 @@ support-files = [
 ["browser_glance_close.js"]
 ["browser_glance_next_tab.js"]
 ["browser_glance_prev_tab.js"]
+["browser_glance_select_parent.js"]

src/zen/tests/glance/browser_glance_select_parent.js

@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Glance_Select_Parent() {
+  await openGlanceOnTab(async (glanceTab) => {
+    ok(
+      glanceTab.hasAttribute('zen-glance-tab'),
+      'The glance tab should have the zen-glance-tab attribute'
+    );
+    await BrowserTestUtils.openNewForegroundTab(window.gBrowser, 'https://example.com/', true, {
+      skipAnimation: true,
+    });
+    const tabToRemove = gBrowser.selectedTab;
+    gBrowser.selectedTab = gZenGlanceManager.getTabOrGlanceParent(glanceTab);
+    await BrowserTestUtils.waitForCondition(() => {
+      return glanceTab.selected;
+    });
+    ok(true, 'The glance tab should be selected');
+    await BrowserTestUtils.removeTab(tabToRemove);
+  });
+});

src/zen/tests/pinned/browser.toml

@@ -1,3 +1,10 @@
+
+["browser_pinned_unload_changed.js"]
+["browser_pinned_unload_noreset.js"]
+["browser_pinned_nounload_reset.js"]
+["browser_pinned_switch.js"]
+["browser_pinned_reset_noswitch.js"]
+["browser_pinned_close.js"]
 ["browser_pinned_changed.js"]
 ["browser_pinned_created.js"]
 ["browser_pinned_edit_label.js"]

src/zen/tests/pinned/browser_pinned_changed.js

@@ -3,7 +3,7 @@
 
 'use strict';
 
-add_task(async function test_Create_Pinned() {
+add_task(async function test_Changed_Pinned() {
   let resolvePromise;
   const promise = new Promise((resolve) => {
     resolvePromise = resolve;

src/zen/tests/pinned/browser_pinned_close.js

@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Unload_NoReset_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'close']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+        document.getElementById('cmd_close').doCommand();
+        setTimeout(() => {
+          ok(tab.closing, 'The tab should be closing after being closed');
+          resolvePromise();
+        }, 100);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});

src/zen/tests/pinned/browser_pinned_nounload_reset.js

@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_NoUnload_Changed_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'reset-switch']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+
+        BrowserTestUtils.startLoadingURIString(browser, 'https://example.com/2');
+        await BrowserTestUtils.browserLoaded(browser, false, 'https://example.com/2');
+        setTimeout(() => {
+          ok(
+            tab.hasAttribute('zen-pinned-changed'),
+            'The tab should have a zen-pinned-changed attribute after being pinned'
+          );
+          document.getElementById('cmd_close').doCommand();
+          setTimeout(() => {
+            ok(
+              !tab.hasAttribute('zen-pinned-changed'),
+              'The tab should not have a zen-pinned-changed attribute after being closed'
+            );
+            ok(
+              !tab.hasAttribute('discarded'),
+              'The tab should not be discarded after being closed'
+            );
+            ok(tab != gBrowser.selectedTab, 'The tab should not be selected after being closed');
+            resolvePromise();
+          }, 100);
+        }, 0);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});

src/zen/tests/pinned/browser_pinned_reset_noswitch.js

@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Unload_NoReset_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'reset']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+
+        BrowserTestUtils.startLoadingURIString(browser, 'https://example.com/2');
+        await BrowserTestUtils.browserLoaded(browser, false, 'https://example.com/2');
+        setTimeout(() => {
+          ok(
+            tab.hasAttribute('zen-pinned-changed'),
+            'The tab should have a zen-pinned-changed attribute after being pinned'
+          );
+          document.getElementById('cmd_close').doCommand();
+          setTimeout(() => {
+            ok(
+              !tab.hasAttribute('zen-pinned-changed'),
+              'The tab should not have a zen-pinned-changed attribute after being closed'
+            );
+            ok(
+              !tab.hasAttribute('discarded'),
+              'The tab should not be discarded after being closed'
+            );
+            ok(tab === gBrowser.selectedTab, 'The tab should not be selected after being closed');
+            resolvePromise();
+          }, 100);
+        }, 0);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});

src/zen/tests/pinned/browser_pinned_switch.js

@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Unload_NoReset_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'switch']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+
+        BrowserTestUtils.startLoadingURIString(browser, 'https://example.com/2');
+        await BrowserTestUtils.browserLoaded(browser, false, 'https://example.com/2');
+        setTimeout(() => {
+          ok(
+            tab.hasAttribute('zen-pinned-changed'),
+            'The tab should have a zen-pinned-changed attribute after being pinned'
+          );
+          document.getElementById('cmd_close').doCommand();
+          setTimeout(() => {
+            ok(
+              tab.hasAttribute('zen-pinned-changed'),
+              'The tab should not have a zen-pinned-changed attribute after being closed'
+            );
+            ok(
+              !tab.hasAttribute('discarded'),
+              'The tab should not be discarded after being closed'
+            );
+            ok(tab != gBrowser.selectedTab, 'The tab should not be selected after being closed');
+            resolvePromise();
+          }, 100);
+        }, 0);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});

src/zen/tests/pinned/browser_pinned_unload_changed.js

@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Unload_Changed_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'reset-unload-switch']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+
+        BrowserTestUtils.startLoadingURIString(browser, 'https://example.com/2');
+        await BrowserTestUtils.browserLoaded(browser, false, 'https://example.com/2');
+        setTimeout(() => {
+          ok(
+            tab.hasAttribute('zen-pinned-changed'),
+            'The tab should have a zen-pinned-changed attribute after being pinned'
+          );
+          document.getElementById('cmd_close').doCommand();
+          setTimeout(() => {
+            ok(
+              !tab.hasAttribute('zen-pinned-changed'),
+              'The tab should not have a zen-pinned-changed attribute after being closed'
+            );
+
+            ok(tab.hasAttribute('discarded'), 'The tab should not be discarded after being closed');
+            ok(tab != gBrowser.selectedTab, 'The tab should not be selected after being closed');
+            resolvePromise();
+          }, 100);
+        }, 0);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});

src/zen/tests/pinned/browser_pinned_unload_noreset.js

@@ -0,0 +1,48 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Unload_NoReset_Pinned() {
+  await SpecialPowers.pushPrefEnv({
+    set: [['zen.pinned-tab-manager.close-shortcut-behavior', 'unload-switch']],
+  });
+
+  let resolvePromise;
+  const promise = new Promise((resolve) => {
+    resolvePromise = resolve;
+  });
+
+  await BrowserTestUtils.withNewTab({ gBrowser, url: 'https://example.com/1' }, async (browser) => {
+    const tab = gBrowser.getTabForBrowser(browser);
+    tab.addEventListener(
+      'ZenPinnedTabCreated',
+      async function (event) {
+        const pinTabID = tab.getAttribute('zen-pin-id');
+        ok(pinTabID, 'The tab should have a zen-pin-id attribute after being pinned');
+
+        BrowserTestUtils.startLoadingURIString(browser, 'https://example.com/2');
+        await BrowserTestUtils.browserLoaded(browser, false, 'https://example.com/2');
+        setTimeout(() => {
+          ok(
+            tab.hasAttribute('zen-pinned-changed'),
+            'The tab should have a zen-pinned-changed attribute after being pinned'
+          );
+          document.getElementById('cmd_close').doCommand();
+          setTimeout(() => {
+            ok(
+              tab.hasAttribute('zen-pinned-changed'),
+              'The tab should not have a zen-pinned-changed attribute after being closed'
+            );
+            ok(tab.hasAttribute('discarded'), 'The tab should not be discarded after being closed');
+            ok(tab != gBrowser.selectedTab, 'The tab should not be selected after being closed');
+            resolvePromise();
+          }, 100);
+        }, 0);
+      },
+      { once: true }
+    );
+    gBrowser.pinTab(tab);
+    await promise;
+  });
+});