Merge branch 'master' of https://github.com/MoonchildProductions/UXP

19 files changed, 703 insertions, 17 deletions

diff --git a/application/palemoon/app/profile/palemoon.js b/application/palemoon/app/profile/palemoon.js
index 15accd146..e53b1693b 100644
--- a/application/palemoon/app/profile/palemoon.js
+++ b/application/palemoon/app/profile/palemoon.js
@@ -463,6 +463,10 @@ pref("browser.tabs.closeButtons", 1);
 // false  return to the adjacent tab (old default)
 pref("browser.tabs.selectOwnerOnClose", true);
 
+pref("browser.tabs.showAudioPlayingIcon", true);
+// This should match Chromium's audio indicator delay.
+pref("browser.tabs.delayHidingAudioPlayingIconMS", 3000);
+
 pref("browser.allTabs.previews", true);
 pref("browser.ctrlTab.previews", true);
 pref("browser.ctrlTab.recentlyUsedLimit", 7);
diff --git a/application/palemoon/base/content/browser-sets.inc b/application/palemoon/base/content/browser-sets.inc
index 25794a65c..78fce2670 100644
--- a/application/palemoon/base/content/browser-sets.inc
+++ b/application/palemoon/base/content/browser-sets.inc
@@ -32,6 +32,7 @@
     <command id="cmd_printPreview" oncommand="PrintUtils.printPreview(PrintPreviewListener);"/>
     <command id="cmd_close" oncommand="BrowserCloseTabOrWindow()"/>
     <command id="cmd_closeWindow" oncommand="BrowserTryToCloseWindow()"/>
+	<command id="cmd_toggleMute" oncommand="gBrowser.selectedTab.toggleMuteAudio()"/>
     <command id="cmd_ToggleTabsOnTop" oncommand="TabsOnTop.toggle()"/>
     <command id="cmd_CustomizeToolbars" oncommand="BrowserCustomizeToolbar()"/>
     <command id="cmd_restartApplication" oncommand="restart(false);"/>
@@ -212,6 +213,7 @@
     <key id="printKb" key="&printCmd.commandkey;" command="cmd_print"  modifiers="accel"/>
     <key id="key_close" key="&closeCmd.key;" command="cmd_close" modifiers="accel"/>
     <key id="key_closeWindow" key="&closeCmd.key;" command="cmd_closeWindow" modifiers="accel,shift"/>
+	<key id="key_toggleMute" key="&toggleMuteCmd.key;" command="cmd_toggleMute" modifiers="control"/>
     <key id="key_undo"
          key="&undoCmd.key;"
          modifiers="accel"/>
diff --git a/application/palemoon/base/content/browser-tabPreviews.js b/application/palemoon/base/content/browser-tabPreviews.js
index eaae78ba8..e0755b81d 100644
--- a/application/palemoon/base/content/browser-tabPreviews.js
+++ b/application/palemoon/base/content/browser-tabPreviews.js
@@ -940,6 +940,13 @@ var allTabs = {
       aPreview.setAttribute("image", aPreview._tab.image);
     else
       aPreview.removeAttribute("image");
+  
+    aPreview.removeAttribute("soundplaying");
+    aPreview.removeAttribute("muted");
+    if (aPreview._tab.hasAttribute("muted"))
+      aPreview.setAttribute("muted", "true");
+    else if (aPreview._tab.hasAttribute("soundplaying"))
+      aPreview.setAttribute("soundplaying", "true");
 
     var thumbnail = tabPreviews.get(aPreview._tab);
     if (aPreview.firstChild) {
diff --git a/application/palemoon/base/content/browser-tabPreviews.xml b/application/palemoon/base/content/browser-tabPreviews.xml
index e957649e7..4f54321ea 100644
--- a/application/palemoon/base/content/browser-tabPreviews.xml
+++ b/application/palemoon/base/content/browser-tabPreviews.xml
@@ -42,7 +42,10 @@
           <xul:hbox class="tabPreview-canvas" xbl:inherits="style=canvasstyle">
             <children/>
           </xul:hbox>
-          <xul:label flex="1" xbl:inherits="value=label,crop" class="allTabs-preview-label plain"/>
+          <xul:hbox align="center">
+            <xul:image xbl:inherits="soundplaying,muted" class="allTabs-endimage"/>
+            <xul:label flex="1" xbl:inherits="value=label,crop" class="allTabs-preview-label plain"/>
+          </xul:hbox>
         </xul:vbox>
         <xul:hbox class="allTabs-favicon-container">
           <xul:image class="allTabs-favicon" xbl:inherits="src=image"/>
diff --git a/application/palemoon/base/content/browser.js b/application/palemoon/base/content/browser.js
index 4167f186c..591d00fbb 100644
--- a/application/palemoon/base/content/browser.js
+++ b/application/palemoon/base/content/browser.js
@@ -976,6 +976,7 @@ var gBrowserInit = {
     CombinedStopReload.init();
     allTabs.readPref();
     TabsOnTop.init();
+    AudioIndicator.init();
     gPrivateBrowsingUI.init();
     TabsInTitlebar.init();
     retrieveToolbarIconsizesFromTheme();
@@ -1364,6 +1365,8 @@ var gBrowserInit = {
     BookmarkingUI.uninit();
 
     TabsOnTop.uninit();
+    
+    AudioIndicator.uninit();
 
     TabsInTitlebar.uninit();
     
@@ -4597,6 +4600,42 @@ function setToolbarVisibility(toolbar, isVisible) {
     ToolbarIconColor.inferFromText();
 }
 
+var AudioIndicator = {
+  init: function () {
+    Services.prefs.addObserver(this._prefName, this, false);
+    this.syncUI();
+  },
+
+  uninit: function () {
+    Services.prefs.removeObserver(this._prefName, this);
+  },
+
+  toggle: function () {
+    this.enabled = !Services.prefs.getBoolPref(this._prefName);
+  },
+
+  syncUI: function () {
+    document.getElementById("context_toggleMuteTab").setAttribute("hidden", this.enabled);
+    document.getElementById("key_toggleMute").setAttribute("disabled", this.enabled);
+  },
+
+  get enabled () {
+    return !Services.prefs.getBoolPref(this._prefName);
+  },
+
+  set enabled (val) {
+    Services.prefs.setBoolPref(this._prefName, !!val);
+    return val;
+  },
+
+  observe: function (subject, topic, data) {
+    if (topic == "nsPref:changed")
+      this.syncUI();
+  },
+
+  _prefName: "browser.tabs.showAudioPlayingIcon"
+}
+
 var TabsOnTop = {
   init: function TabsOnTop_init() {
     Services.prefs.addObserver(this._prefName, this, false);
@@ -7021,6 +7060,17 @@ function restoreLastSession() {
 
 var TabContextMenu = {
   contextTab: null,
+  _updateToggleMuteMenuItem(aTab, aConditionFn) {
+    ["muted", "soundplaying"].forEach(attr => {
+      if (!aConditionFn || aConditionFn(attr)) {
+        if (aTab.hasAttribute(attr)) {
+          aTab.toggleMuteMenuItem.setAttribute(attr, "true");
+        } else {
+          aTab.toggleMuteMenuItem.removeAttribute(attr);
+        }
+      }
+    });
+  },
   updateContextMenu: function updateContextMenu(aPopupMenu) {
     this.contextTab = aPopupMenu.triggerNode.localName == "tab" ?
                       aPopupMenu.triggerNode : gBrowser.selectedTab;
@@ -7067,6 +7117,35 @@ var TabContextMenu = {
     bookmarkAllTabs.hidden = this.contextTab.pinned;
     if (!bookmarkAllTabs.hidden)
       PlacesCommandHook.updateBookmarkAllTabsCommand();
+
+    // Adjust the state of the toggle mute menu item.
+    let toggleMute = document.getElementById("context_toggleMuteTab");
+    if (this.contextTab.hasAttribute("muted")) {
+      toggleMute.label = gNavigatorBundle.getString("unmuteTab.label");
+      toggleMute.accessKey = gNavigatorBundle.getString("unmuteTab.accesskey");
+    } else {
+      toggleMute.label = gNavigatorBundle.getString("muteTab.label");
+      toggleMute.accessKey = gNavigatorBundle.getString("muteTab.accesskey");
+    }
+    
+    this.contextTab.toggleMuteMenuItem = toggleMute;
+    this._updateToggleMuteMenuItem(this.contextTab);
+
+    this.contextTab.addEventListener("TabAttrModified", this, false);
+    aPopupMenu.addEventListener("popuphiding", this, false);
+  },
+  handleEvent(aEvent) {
+    switch (aEvent.type) {
+      case "popuphiding":
+        gBrowser.removeEventListener("TabAttrModified", this);
+        aEvent.target.removeEventListener("popuphiding", this);
+        break;
+      case "TabAttrModified":
+        let tab = aEvent.target;
+        this._updateToggleMuteMenuItem(tab,
+          attr => aEvent.detail.changed.indexOf(attr) >= 0);
+        break;
+    }
   }
 };
 
diff --git a/application/palemoon/base/content/browser.xul b/application/palemoon/base/content/browser.xul
index 07ca54722..ce2a7c5a8 100644
--- a/application/palemoon/base/content/browser.xul
+++ b/application/palemoon/base/content/browser.xul
@@ -87,6 +87,7 @@
                onpopuphidden="if (event.target == this) TabContextMenu.contextTab = null;">
       <menuitem id="context_reloadTab" label="&reloadTab.label;" accesskey="&reloadTab.accesskey;"
                 oncommand="gBrowser.reloadTab(TabContextMenu.contextTab);"/>
+      <menuitem id="context_toggleMuteTab" oncommand="TabContextMenu.contextTab.toggleMuteAudio();"/>
       <menuseparator/>
       <menuitem id="context_pinTab" label="&pinTab.label;"
                 accesskey="&pinTab.accesskey;"
diff --git a/application/palemoon/base/content/tabbrowser.css b/application/palemoon/base/content/tabbrowser.css
index 94d6dbb2e..43536b27a 100644
--- a/application/palemoon/base/content/tabbrowser.css
+++ b/application/palemoon/base/content/tabbrowser.css
@@ -45,10 +45,19 @@ tabpanels {
 }
 
 .tab-throbber:not([busy]),
-.tab-throbber[busy] + .tab-icon-image {
+.tab-throbber[busy] + .tab-icon-image,
+.tab-icon-sound:not([soundplaying]):not([muted]):not([blocked]),
+.tab-icon-sound[pinned],
+.tab-icon-overlay {
   display: none;
 }
 
+.tab-icon-overlay[soundplaying][pinned],
+.tab-icon-overlay[muted][pinned],
+.tab-icon-overlay[blocked][pinned] {
+  display: -moz-box;
+}
+
 .closing-tabs-spacer {
   pointer-events: none;
 }
diff --git a/application/palemoon/base/content/tabbrowser.xml b/application/palemoon/base/content/tabbrowser.xml
index dc6cb0a9d..929afd057 100644
--- a/application/palemoon/base/content/tabbrowser.xml
+++ b/application/palemoon/base/content/tabbrowser.xml
@@ -438,6 +438,22 @@
         </body>
       </method>
 
+      <method name="getTabFromAudioEvent">
+        <parameter name="aEvent"/>
+        <body>
+        <![CDATA[
+          if (!Services.prefs.getBoolPref("browser.tabs.showAudioPlayingIcon") ||
+              !aEvent.isTrusted) {
+            return null;
+          }
+
+          var browser = aEvent.originalTarget;
+          var tab = this.getTabForBrowser(browser);
+          return tab;
+        ]]>
+        </body>
+      </method>
+
       <method name="_callProgressListeners">
         <parameter name="aBrowser"/>
         <parameter name="aMethod"/>
@@ -616,7 +632,7 @@
 
                 if (this.mTab.hasAttribute("busy")) {
                   this.mTab.removeAttribute("busy");
-                  this.mTabBrowser._tabAttrModified(this.mTab);
+                  this.mTabBrowser._tabAttrModified(this.mTab, ["busy"]);
                   if (!this.mTab.selected)
                     this.mTab.setAttribute("unread", "true");
                 }
@@ -686,6 +702,8 @@
               let topLevel = aWebProgress.isTopLevel;
 
               if (topLevel) {
+                let isSameDocument =
+                  !!(aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT);
                 // We need to clear the typed value
                 // if the document failed to load, to make sure the urlbar reflects the
                 // failed URI (particularly for SSL errors). However, don't clear the value
@@ -696,6 +714,19 @@
                      aLocation.spec != "about:blank"))
                   this.mBrowser.userTypedValue = null;
 
+                // If the browser was playing audio, we should remove the playing state.
+                if (this.mTab.hasAttribute("soundplaying") && !isSameDocument) {
+                  clearTimeout(this.mTab._soundPlayingAttrRemovalTimer);
+                  this.mTab._soundPlayingAttrRemovalTimer = 0;
+                  this.mTab.removeAttribute("soundplaying");
+                  this.mTabBrowser._tabAttrModified(this.mTab, ["soundplaying"]);
+                }
+
+                // If the browser was previously muted, we should restore the muted state.
+                if (this.mTab.hasAttribute("muted")) {
+                  this.mTab.linkedBrowser.mute();
+                }
+
                 // Don't clear the favicon if this onLocationChange was
                 // triggered by a pushState or a replaceState.  See bug 550565.
                 if (!gMultiProcessBrowser) {
@@ -804,7 +835,7 @@
                 aTab.setAttribute("image", sizedIconUrl);
               else
                 aTab.removeAttribute("image");
-              this._tabAttrModified(aTab);
+              this._tabAttrModified(aTab, ["image"]);
             }
 
             this._callProgressListeners(browser, "onLinkIconAvailable", [browser.mIconURL]);
@@ -1116,8 +1147,8 @@
               });
               this.mCurrentTab.dispatchEvent(event);
 
-              this._tabAttrModified(oldTab);
-              this._tabAttrModified(this.mCurrentTab);
+              this._tabAttrModified(oldTab, ["selected"]);
+              this._tabAttrModified(this.mCurrentTab, ["selected"]);
 
               // Adjust focus
               oldBrowser._urlbarFocused = (gURLBar && gURLBar.focused);
@@ -1187,14 +1218,18 @@
 
       <method name="_tabAttrModified">
         <parameter name="aTab"/>
+        <parameter name="aChanged"/>
         <body><![CDATA[
           if (aTab.closing)
             return;
 
-          // This event should be dispatched when any of these attributes change:
-          // label, crop, busy, image, selected
-          var event = document.createEvent("Events");
-          event.initEvent("TabAttrModified", true, false);
+          let event = new CustomEvent("TabAttrModified", {
+            bubbles: true,
+            cancelable: false,
+            detail: {
+              changed: aChanged,
+            }
+          });
           aTab.dispatchEvent(event);
         ]]></body>
       </method>
@@ -1205,7 +1240,7 @@
           <![CDATA[
             aTab.label = this.mStringBundle.getString("tabs.connecting");
             aTab.crop = "end";
-            this._tabAttrModified(aTab);
+            this._tabAttrModified(aTab, ["label", "crop"]);
           ]]>
         </body>
       </method>
@@ -1250,7 +1285,7 @@
 
             aTab.label = title;
             aTab.crop = crop;
-            this._tabAttrModified(aTab);
+            this._tabAttrModified(aTab, ["label", "crop"]);
 
             if (aTab.selected)
               this.updateTitlebar();
@@ -2239,6 +2274,14 @@
             var remoteBrowser = aOtherTab.ownerDocument.defaultView.gBrowser;
             var isPending = aOtherTab.hasAttribute("pending");
 
+            // Expedite the removal of the icon if it was already scheduled.
+            if (aOtherTab._soundPlayingAttrRemovalTimer) {
+              clearTimeout(aOtherTab._soundPlayingAttrRemovalTimer);
+              aOtherTab._soundPlayingAttrRemovalTimer = 0;
+              aOtherTab.removeAttribute("soundplaying");
+              remoteBrowser._tabAttrModified(aOtherTab, ["soundplaying"]);
+            }
+
             // First, start teardown of the other browser.  Make sure to not
             // fire the beforeunload event in the process.  Close the other
             // window if this was its last tab.
@@ -2248,6 +2291,18 @@
             let ourBrowser = this.getBrowserForTab(aOurTab);
             let otherBrowser = aOtherTab.linkedBrowser;
 
+            let modifiedAttrs = [];
+            if (aOtherTab.hasAttribute("muted")) {
+              aOurTab.setAttribute("muted", "true");
+              aOurTab.muteReason = aOtherTab.muteReason;
+              ourBrowser.mute();
+              modifiedAttrs.push("muted");
+            }
+            if (aOtherTab.hasAttribute("soundplaying")) {
+              aOurTab.setAttribute("soundplaying", "true");
+              modifiedAttrs.push("soundplaying");
+            }
+
             // If the other tab is pending (i.e. has not been restored, yet)
             // then do not switch docShells but retrieve the other tab's state
             // and apply it to our tab.
@@ -2266,7 +2321,7 @@
               var isBusy = aOtherTab.hasAttribute("busy");
               if (isBusy) {
                 aOurTab.setAttribute("busy", "true");
-                this._tabAttrModified(aOurTab);
+                modifiedAttrs.push("busy");
                 if (aOurTab.selected)
                   this.mIsBusy = true;
               }
@@ -2286,6 +2341,10 @@
             // of replaceTabWithWindow), notify onLocationChange, etc.
             if (aOurTab.selected)
               this.updateCurrentBrowser(true);
+
+            if (modifiedAttrs.length) {
+              this._tabAttrModified(aOurTab, modifiedAttrs);
+            }
           ]]>
         </body>
       </method>
@@ -3084,9 +3143,25 @@
             event.preventDefault();
             return;
           }
-          event.target.setAttribute("label", tab.mOverCloseButton ?
-                                             tab.getAttribute("closetabtext") :
-                                             tab.getAttribute("label"));
+
+          var stringID, label;
+          if (tab.mOverCloseButton) {
+            stringID = "tabs.closeTab";
+          } else if (tab._overPlayingIcon) {
+            if (tab.linkedBrowser.audioBlocked) {
+              stringID = "tabs.unblockAudio.tooltip";
+            } else {
+              stringID = tab.linkedBrowser.audioMuted ?
+                "tabs.unmuteAudio.tooltip" :
+                "tabs.muteAudio.tooltip";
+            }
+          } else {
+            label = tab.getAttribute("label");
+          }
+          if (stringID && !label) {
+            label = this.mStringBundle.getString(stringID);
+          }
+          event.target.setAttribute("label", label);
         ]]></body>
       </method>
 
@@ -3300,6 +3375,7 @@
         ]]>
         </getter>
       </property>
+      <field name="_soundPlayingAttrRemovalTimer">0</field>
     </implementation>
 
     <handlers>
@@ -3347,6 +3423,78 @@
             tab.setAttribute("titlechanged", "true");
         ]]>
       </handler>
+      <handler event="DOMAudioPlaybackStarted">
+        <![CDATA[
+          var tab = getTabFromAudioEvent(event)
+          if (!tab) {
+            return;
+          }
+
+          clearTimeout(tab._soundPlayingAttrRemovalTimer);
+          tab._soundPlayingAttrRemovalTimer = 0;
+
+          let modifiedAttrs = [];
+          if (tab.hasAttribute("soundplaying-scheduledremoval")) {
+            tab.removeAttribute("soundplaying-scheduledremoval");
+            modifiedAttrs.push("soundplaying-scheduledremoval");
+          }
+
+          if (!tab.hasAttribute("soundplaying")) {
+            tab.setAttribute("soundplaying", true);
+            modifiedAttrs.push("soundplaying");
+          }
+
+          this._tabAttrModified(tab, modifiedAttrs);
+        ]]>
+      </handler>
+      <handler event="DOMAudioPlaybackStopped">
+        <![CDATA[
+          var tab = getTabFromAudioEvent(event)
+          if (!tab) {
+            return;
+          }
+
+          if (tab.hasAttribute("soundplaying")) {
+            let removalDelay = Services.prefs.getIntPref("browser.tabs.delayHidingAudioPlayingIconMS");
+
+            tab.style.setProperty("--soundplaying-removal-delay", `${removalDelay - 300}ms`);
+            tab.setAttribute("soundplaying-scheduledremoval", "true");
+            this._tabAttrModified(tab, ["soundplaying-scheduledremoval"]);
+
+            tab._soundPlayingAttrRemovalTimer = setTimeout(() => {
+              tab.removeAttribute("soundplaying-scheduledremoval");
+              tab.removeAttribute("soundplaying");
+              this._tabAttrModified(tab, ["soundplaying", "soundplaying-scheduledremoval"]);
+            }, removalDelay);
+          }
+        ]]>
+      </handler>
+      <handler event="DOMAudioPlaybackBlockStarted">
+        <![CDATA[
+          var tab = getTabFromAudioEvent(event)
+          if (!tab) {
+            return;
+          }
+
+          if (!tab.hasAttribute("blocked")) {
+            tab.setAttribute("blocked", true);
+            this._tabAttrModified(tab, ["blocked"]);
+          }
+        ]]>
+      </handler>
+      <handler event="DOMAudioPlaybackBlockStopped">
+        <![CDATA[
+          var tab = getTabFromAudioEvent(event)
+          if (!tab) {
+            return;
+          }
+
+          if (tab.hasAttribute("blocked")) {
+            tab.removeAttribute("blocked");
+            this._tabAttrModified(tab, ["blocked"]);
+          }
+        ]]>
+      </handler>
     </handlers>
   </binding>
 
@@ -4758,10 +4906,18 @@
                      class="tab-icon-image"
                      role="presentation"
                      anonid="tab-icon"/>
+          <xul:image xbl:inherits="busy,soundplaying,soundplaying-scheduledremoval,pinned,muted,blocked,selected"
+                     anonid="overlay-icon"
+                     class="tab-icon-overlay"
+                     role="presentation"/>
           <xul:label flex="1"
                      xbl:inherits="value=label,crop,accesskey,fadein,pinned,selected"
                      class="tab-text tab-label"
                      role="presentation"/>
+          <xul:image xbl:inherits="soundplaying,soundplaying-scheduledremoval,pinned,muted,blocked,selected"
+                     anonid="soundplaying-icon"
+                     class="tab-icon-sound"
+                     role="presentation"/>
           <xul:toolbarbutton anonid="close-button"
                              xbl:inherits="fadein,pinned,selected"
                              class="tab-close-button close-icon"/>
@@ -4782,9 +4938,59 @@
       </property>
 
       <field name="mOverCloseButton">false</field>
+      <property name="_overPlayingIcon" readonly="true">
+        <getter><![CDATA[
+          let iconVisible = this.hasAttribute("soundplaying") ||
+                            this.hasAttribute("muted") ||
+                            this.hasAttribute("blocked");
+          let soundPlayingIcon =
+            document.getAnonymousElementByAttribute(this, "anonid", "soundplaying-icon");
+          let overlayIcon =
+            document.getAnonymousElementByAttribute(this, "anonid", "overlay-icon");
+
+          return soundPlayingIcon && soundPlayingIcon.matches(":hover") ||
+                 (overlayIcon && overlayIcon.matches(":hover") && iconVisible);
+        ]]></getter>
+      </property>
       <field name="mCorrespondingMenuitem">null</field>
       <field name="closing">false</field>
       <field name="lastAccessed">0</field>
+      
+      <method name="toggleMuteAudio">
+        <parameter name="aMuteReason"/>
+        <body>
+        <![CDATA[
+          let tabContainer = this.parentNode;
+          let browser = this.linkedBrowser;
+          let modifiedAttrs = [];
+          if (browser.audioBlocked) {
+            this.removeAttribute("blocked");
+            modifiedAttrs.push("blocked");
+
+            // We don't want sound icon flickering between "blocked", "none" and
+            // "sound-playing", here adding the "soundplaying" is to keep the
+            // transition smoothly.
+            if (!this.hasAttribute("soundplaying")) {
+              this.setAttribute("soundplaying", true);
+              modifiedAttrs.push("soundplaying");
+            }
+
+            browser.resumeMedia();
+          } else {
+            if (browser.audioMuted) {
+              browser.unmute();
+              this.removeAttribute("muted");
+            } else {
+              browser.mute();
+              this.setAttribute("muted", "true");
+            }
+            this.muteReason = aMuteReason || null;
+            modifiedAttrs.push("muted");
+          }
+          tabContainer.tabbrowser._tabAttrModified(this, modifiedAttrs);
+        ]]>
+        </body>
+      </method>
     </implementation>
 
     <handlers>
@@ -4843,7 +5049,8 @@
         if (this.selected) {
           this.style.MozUserFocus = 'ignore';
           this.clientTop; // just using this to flush style updates
-        } else if (this.mOverCloseButton) {
+        } else if (this.mOverCloseButton ||
+                   this._overPlayingIcon) {
           // Prevent tabbox.xml from selecting the tab.
           event.stopPropagation();
         }
@@ -4852,6 +5059,17 @@
       <handler event="mouseup">
         this.style.MozUserFocus = '';
       </handler>
+      <handler event="click">
+      <![CDATA[
+        if (event.button != 0) {
+          return;
+        }
+
+        if (this._overPlayingIcon) {
+          this.toggleMuteAudio();
+        }
+      ]]>
+      </handler>
     </handlers>
   </binding>
 
@@ -4957,6 +5175,24 @@
             aMenuitem.setAttribute("selected", "true");
           else
             aMenuitem.removeAttribute("selected");
+
+          function addEndImage() {
+            let endImage = document.createElement("image");
+            endImage.setAttribute("class", "allTabs-endimage");
+            let endImageContainer = document.createElement("hbox");
+            endImageContainer.setAttribute("align", "center");
+            endImageContainer.setAttribute("pack", "center");
+            endImageContainer.appendChild(endImage);
+            aMenuitem.appendChild(endImageContainer);
+            return endImage;
+          }
+
+          if (aMenuitem.firstChild)
+            aMenuitem.firstChild.remove();
+          if (aTab.hasAttribute("muted"))
+            addEndImage().setAttribute("muted", "true");
+          else if (aTab.hasAttribute("soundplaying"))
+            addEndImage().setAttribute("soundplaying", "true");
         ]]></body>
       </method>
     </implementation>
diff --git a/application/palemoon/locales/en-US/chrome/browser/browser.dtd b/application/palemoon/locales/en-US/chrome/browser/browser.dtd
index 2d80c8078..8632b44b4 100644
--- a/application/palemoon/locales/en-US/chrome/browser/browser.dtd
+++ b/application/palemoon/locales/en-US/chrome/browser/browser.dtd
@@ -507,6 +507,8 @@ you can use these alternative items. Otherwise, their values should be empty.  -
 <!ENTITY closeCmd.key                   "W">  
 <!ENTITY closeCmd.accesskey             "C">
 
+<!ENTITY toggleMuteCmd.key              "M">
+
 <!ENTITY pageStyleMenu.label "Page Style">
 <!ENTITY pageStyleMenu.accesskey "y">
 <!ENTITY pageStyleNoStyle.label "No Style">
diff --git a/application/palemoon/locales/en-US/chrome/browser/browser.properties b/application/palemoon/locales/en-US/chrome/browser/browser.properties
index 9969bd753..dbe6dbaa1 100644
--- a/application/palemoon/locales/en-US/chrome/browser/browser.properties
+++ b/application/palemoon/locales/en-US/chrome/browser/browser.properties
@@ -397,3 +397,8 @@ slowStartup.helpButton.label = Learn How to Speed It Up
 slowStartup.helpButton.accesskey = L
 slowStartup.disableNotificationButton.label = Don't Tell Me Again
 slowStartup.disableNotificationButton.accesskey = A
+
+muteTab.label = Mute Tab
+muteTab.accesskey = M
+unmuteTab.label = Unmute Tab
+unmuteTab.accesskey = M
\ No newline at end of file
diff --git a/application/palemoon/locales/en-US/chrome/browser/tabbrowser.properties b/application/palemoon/locales/en-US/chrome/browser/tabbrowser.properties
index 0d21d4d14..a4a0be0a0 100644
--- a/application/palemoon/locales/en-US/chrome/browser/tabbrowser.properties
+++ b/application/palemoon/locales/en-US/chrome/browser/tabbrowser.properties
@@ -24,3 +24,7 @@ tabs.closeWarningTitle=Confirm close
 tabs.closeWarningMultipleTabs=You are about to close %S tabs. Are you sure you want to continue?
 tabs.closeButtonMultiple=Close tabs
 tabs.closeWarningPromptMe=Warn me when I attempt to close multiple tabs
+
+tabs.muteAudio.tooltip=Mute tab
+tabs.unmuteAudio.tooltip=Unmute tab
+tabs.unblockAudio.tooltip=Play tab
diff --git a/application/palemoon/themes/linux/browser.css b/application/palemoon/themes/linux/browser.css
index c6587babc..516677fe6 100644
--- a/application/palemoon/themes/linux/browser.css
+++ b/application/palemoon/themes/linux/browser.css
@@ -1758,6 +1758,90 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   -moz-margin-end: -1px;
 }
 
+/* Tab sound indicator */
+.tab-icon-sound {
+  -moz-margin-start: 4px;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+}
+
+.allTabs-endimage[soundplaying],
+.tab-icon-sound[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio");
+}
+
+.allTabs-endimage[muted],
+.tab-icon-sound[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted");
+}
+
+.allTabs-endimage[blocked],
+.tab-icon-sound[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-sound[soundplaying],
+#TabsToolbar[brighttext] .tab-icon-sound[blocked],
+#TabsToolbar[brighttext] .tab-icon-sound[muted] {
+  filter: invert(1);
+}
+
+.tab-icon-sound[soundplaying-scheduledremoval]:not([muted]):not(:hover),
+.tab-icon-overlay[soundplaying-scheduledremoval]:not([muted]):not(:hover) {
+  transition: opacity .3s linear var(--soundplaying-removal-delay);
+  opacity: 0;
+}
+
+/* Tab icon overlay */
+.tab-icon-overlay {
+  width: 16px;
+  height: 16px;
+  margin-top: -8px;
+  margin-inline-start: -15px;
+  margin-inline-end: -1px;
+  position: relative;
+}
+
+.tab-icon-overlay[soundplaying],
+.tab-icon-overlay[muted]:not([crashed]),
+.tab-icon-overlay[blocked]:not([crashed]) {
+  border-radius: 10px;
+}
+
+.tab-icon-overlay[soundplaying]:hover,
+.tab-icon-overlay[muted]:not([crashed]):hover,
+.tab-icon-overlay[blocked]:not([crashed]):hover {
+  background-color: white;
+}
+
+.tab-icon-overlay[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio");
+}
+
+.tab-icon-overlay[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-muted");
+}
+
+.tab-icon-overlay[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[soundplaying]:not([selected]):not(:hover),
+.tab-icon-overlay[soundplaying][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[muted]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[muted][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-muted");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[blocked]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[blocked][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-blocked");
+}
+
 /* Tabstrip new tab button */
 .tabs-newtab-button,
 #TabsToolbar > #new-tab-button ,
diff --git a/application/palemoon/themes/linux/jar.mn b/application/palemoon/themes/linux/jar.mn
index 8b2e9dc77..8cb6878e8 100644
--- a/application/palemoon/themes/linux/jar.mn
+++ b/application/palemoon/themes/linux/jar.mn
@@ -123,6 +123,8 @@ browser.jar:
   skin/classic/browser/tabbrowser/tab.png             (tabbrowser/tab.png)
   skin/classic/browser/tabbrowser/tab-overflow-border.png (tabbrowser/tab-overflow-border.png)
   skin/classic/browser/tabbrowser/tabDragIndicator.png (tabbrowser/tabDragIndicator.png)
+  skin/classic/browser/tabbrowser/tab-audio.svg       (../shared/tabbrowser/tab-audio.svg)
+  skin/classic/browser/tabbrowser/tab-audio-small.svg (../shared/tabbrowser/tab-audio-small.svg)
 #ifdef MOZ_SERVICES_SYNC
   skin/classic/browser/sync-16-throbber.png
   skin/classic/browser/sync-16.png
diff --git a/application/palemoon/themes/osx/browser.css b/application/palemoon/themes/osx/browser.css
index a915af3a3..a7bd683bd 100644
--- a/application/palemoon/themes/osx/browser.css
+++ b/application/palemoon/themes/osx/browser.css
@@ -1821,6 +1821,90 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
     }
 }
   
+/* Tab sound indicator */
+.tab-icon-sound {
+  -moz-margin-start: 4px;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+}
+
+.allTabs-endimage[soundplaying],
+.tab-icon-sound[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio");
+}
+
+.allTabs-endimage[muted],
+.tab-icon-sound[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted");
+}
+
+.allTabs-endimage[blocked],
+.tab-icon-sound[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-sound[soundplaying],
+#TabsToolbar[brighttext] .tab-icon-sound[blocked],
+#TabsToolbar[brighttext] .tab-icon-sound[muted] {
+  filter: invert(1);
+}
+
+.tab-icon-sound[soundplaying-scheduledremoval]:not([muted]):not(:hover),
+.tab-icon-overlay[soundplaying-scheduledremoval]:not([muted]):not(:hover) {
+  transition: opacity .3s linear var(--soundplaying-removal-delay);
+  opacity: 0;
+}
+
+/* Tab icon overlay */
+.tab-icon-overlay {
+  width: 16px;
+  height: 16px;
+  margin-top: -8px;
+  margin-inline-start: -15px;
+  margin-inline-end: -1px;
+  position: relative;
+}
+
+.tab-icon-overlay[soundplaying],
+.tab-icon-overlay[muted]:not([crashed]),
+.tab-icon-overlay[blocked]:not([crashed]) {
+  border-radius: 10px;
+}
+
+.tab-icon-overlay[soundplaying]:hover,
+.tab-icon-overlay[muted]:not([crashed]):hover,
+.tab-icon-overlay[blocked]:not([crashed]):hover {
+  background-color: white;
+}
+
+.tab-icon-overlay[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio");
+}
+
+.tab-icon-overlay[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-muted");
+}
+
+.tab-icon-overlay[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[soundplaying]:not([selected]):not(:hover),
+.tab-icon-overlay[soundplaying][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[muted]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[muted][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-muted");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[blocked]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[blocked][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-blocked");
+}
+
 /* Tab scrollbox arrow, tabstrip new tab and all-tabs buttons */
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
diff --git a/application/palemoon/themes/osx/jar.mn b/application/palemoon/themes/osx/jar.mn
index a66563989..1a11d0a30 100644
--- a/application/palemoon/themes/osx/jar.mn
+++ b/application/palemoon/themes/osx/jar.mn
@@ -166,6 +166,8 @@ browser.jar:
         skin/classic/browser/tabbrowser/tab-arrow-left-inverted.png  (tabbrowser/tab-arrow-left-inverted.png)
         skin/classic/browser/tabbrowser/tab-overflow-border.png      (tabbrowser/tab-overflow-border.png)
         skin/classic/browser/tabbrowser/tabDragIndicator.png         (tabbrowser/tabDragIndicator.png)
+        skin/classic/browser/tabbrowser/tab-audio.svg                (../shared/tabbrowser/tab-audio.svg)
+        skin/classic/browser/tabbrowser/tab-audio-small.svg          (../shared/tabbrowser/tab-audio-small.svg)
 #ifdef MOZ_SERVICES_SYNC
         skin/classic/browser/sync-throbber.png
         skin/classic/browser/sync-16.png
diff --git a/application/palemoon/themes/shared/tabbrowser/tab-audio-small.svg b/application/palemoon/themes/shared/tabbrowser/tab-audio-small.svg
new file mode 100644
index 000000000..abfe71268
--- /dev/null
+++ b/application/palemoon/themes/shared/tabbrowser/tab-audio-small.svg
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16">
+  <style>
+    .icon:not(:target) {
+      display: none;
+    }
+
+    .icon {
+      fill: #262626;
+    }
+    .icon > .outline {
+      fill: #fff;
+    }
+
+    .icon.white {
+      fill: #fff;
+    }
+    .icon.white > .outline {
+      fill: #000;
+      fill-opacity: .5;
+    }
+  </style>
+
+  <g id="tab-audio" class="icon">
+    <path class="outline" d="M12.4,3.6l-1-0.6l-0.9,2.5H10V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5H4C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.6l3.6,3.6 c0.3,0.3,0.9,0.1,0.9-0.4v-3.7h0.5l0.9,2.5l1-0.6C14,11.5,15,9.8,15,8S14,4.5,12.4,3.6z M9,13l-3-3H4c-0.6,0-1-0.4-1-1V7 c0-0.6,0.4-1,1-1h2l3-3V13z M10,9.5v-3c0.8,0,1.5,0.7,1.5,1.5S10.8,9.5,10,9.5z M11.9,11.5l-0.4-0.9C12.4,10,13,9.1,13,8 s-0.6-2-1.4-2.5l0.3-1C13.2,5.2,14,6.5,14,8S13.2,10.8,11.9,11.5z"/>
+    <path d="M4,6C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h2l3,3V3L6,6H4z M10,6.5v3c0.8,0,1.5-0.7,1.5-1.5S10.8,6.5,10,6.5z M11.9,4.5 l-0.4,0.9C12.4,6,13,6.9,13,8s-0.6,2-1.4,2.5l0.4,0.9c1.2-0.7,2.1-2,2.1-3.5S13.2,5.2,11.9,4.5z"/>
+  </g>
+  <g id="tab-audio-muted" class="icon">
+    <path class="outline" d="M5.6,5H4C2.9,5,2,5.9,2,7v2c0,0.7,0.3,1.3,0.9,1.7l-1.8,1.8l2.5,2.5l3-3l2.6,2.6c0.3,0.3,0.9,0.1,0.9-0.4V8.5l3.9-3.9 l-2.5-2.5L10,3.5V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5z"/>
+    <path d="M11.5,3.5L9,5.9V3L6,6H4C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h0.9l-2.5,2.5l1.1,1.1l9-9L11.5,3.5z M9,13V9.7l-1.7,1.7L9,13z"/>
+  </g>
+
+  <g id="tab-audio-white" class="icon white">
+    <path class="outline" d="M12.4,3.6l-1-0.6l-0.9,2.5H10V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5H4C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.6l3.6,3.6 c0.3,0.3,0.9,0.1,0.9-0.4v-3.7h0.5l0.9,2.5l1-0.6C14,11.5,15,9.8,15,8S14,4.5,12.4,3.6z M9,13l-3-3H4c-0.6,0-1-0.4-1-1V7 c0-0.6,0.4-1,1-1h2l3-3V13z M10,9.5v-3c0.8,0,1.5,0.7,1.5,1.5S10.8,9.5,10,9.5z M11.9,11.5l-0.4-0.9C12.4,10,13,9.1,13,8 s-0.6-2-1.4-2.5l0.3-1C13.2,5.2,14,6.5,14,8S13.2,10.8,11.9,11.5z"/>
+    <path d="M4,6C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h2l3,3V3L6,6H4z M10,6.5v3c0.8,0,1.5-0.7,1.5-1.5S10.8,6.5,10,6.5z M11.9,4.5 l-0.4,0.9C12.4,6,13,6.9,13,8s-0.6,2-1.4,2.5l0.4,0.9c1.2-0.7,2.1-2,2.1-3.5S13.2,5.2,11.9,4.5z"/>
+  </g>
+  <g id="tab-audio-white-muted" class="icon white">
+    <path class="outline" d="M5.6,5H4C2.9,5,2,5.9,2,7v2c0,0.7,0.3,1.3,0.9,1.7l-1.8,1.8l2.5,2.5l3-3l2.6,2.6c0.3,0.3,0.9,0.1,0.9-0.4V8.5l3.9-3.9 l-2.5-2.5L10,3.5V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5z"/>
+    <path d="M11.5,3.5L9,5.9V3L6,6H4C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h0.9l-2.5,2.5l1.1,1.1l9-9L11.5,3.5z M9,13V9.7l-1.7,1.7L9,13z"/>
+  </g>
+
+  <g id="tab-audio-blocked" class="icon">
+    <path class="outline" d="M8,1.2C4.3,1.2,1.2,4.3,1.2,8s3.1,6.8,6.8,6.8s6.8-3.1,6.8-6.8S11.7,1.2,8,1.2z M8,11.9
+      c-2.1,0-3.9-1.7-3.9-3.9c0-2.1,1.7-3.9,3.9-3.9s3.9,1.7,3.9,3.9C11.9,10.1,10.1,11.9,8,11.9z M11.1,7.3L6.6,4.6L5.4,3.9v1.4v5.3V12
+      l1.2-0.7L11,8.6L12.2,8L11.1,7.3z"/>
+    <path d="M8,2C4.7,2,2,4.7,2,8s2.7,6,6,6s6-2.7,6-6S11.3,2,8,2z M8,12.7c-2.6,0-4.7-2.1-4.7-4.7
+      S5.4,3.3,8,3.3s4.7,2.1,4.7,4.7S10.6,12.7,8,12.7z M10.7,8L6.2,5.3v5.4L10.7,8z"/>
+  </g>
+  <g id="tab-audio-white-blocked" class="icon">
+    <path class="outline" d="M8,0c3.3,0,6.4,2.2,7.5,5.3c1.1,3.1,0.1,6.7-2.5,8.9c-2.6,2.1-6.3,2.4-9.2,0.7
+      C1,13.1-0.5,9.8,0.1,6.5C0.9,2.8,4.2,0,8,0z"/>
+    <path d="M8,2C4.7,2,2,4.7,2,8s2.7,6,6,6s6-2.7,6-6S11.3,2,8,2z M8,12.7c-2.6,0-4.7-2.1-4.7-4.7
+      S5.4,3.3,8,3.3s4.7,2.1,4.7,4.7S10.6,12.7,8,12.7z M10.7,8L6.2,5.3v5.4L10.7,8z"/>
+  </g>
+</svg>
diff --git a/application/palemoon/themes/shared/tabbrowser/tab-audio.svg b/application/palemoon/themes/shared/tabbrowser/tab-audio.svg
new file mode 100644
index 000000000..274e10c29
--- /dev/null
+++ b/application/palemoon/themes/shared/tabbrowser/tab-audio.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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/. -->
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+  <style>
+    path:not(:target) {
+      display: none;
+    }
+  </style>
+
+  <path id="tab-audio" d="M4,5C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.2L9,14V2L5.2,5H4z M11,8c0-0.6-0.4-1-1-1v2C10.6,9,11,8.6,11,8z M13,8 c0-1.4-1-2.6-2.3-2.9L10.4,6C11.3,6.2,12,7,12,8s-0.7,1.8-1.6,2l0.4,0.9C12,10.6,13,9.4,13,8z M11.4,3.2l-0.4,0.9 C12.8,4.6,14,6.2,14,8s-1.2,3.4-2.9,3.8l0.4,0.9C13.5,12.2,15,10.3,15,8S13.5,3.8,11.4,3.2z"/>
+
+  <path id="tab-audio-muted" d="M12.5,3.4L9,6.3V2L5.2,5H4C2.9,5,2,5.9,2,7v2c0,0.9,0.6,1.6,1.4,1.9l-1.9,1.5l1,1.2l11-9L12.5,3.4z M9,14v-4l-2.5,2L9,14z"/>
+
+  <path id="tab-audio-blocked" d="M8,0C3.6,0,0,3.6,0,8s3.6,8,8,8s8-3.6,8-8S12.4,0,8,0z M5.6,11.6l6-3.6l-6-3.6V11.6z M8,14.2
+  c-3.4,0-6.2-2.8-6.2-6.2S4.6,1.8,8,1.8s6.2,2.8,6.2,6.2S11.4,14.2,8,14.2z"/>
+</svg>
diff --git a/application/palemoon/themes/windows/browser.css b/application/palemoon/themes/windows/browser.css
index e4f5f679f..f921554df 100644
--- a/application/palemoon/themes/windows/browser.css
+++ b/application/palemoon/themes/windows/browser.css
@@ -2018,6 +2018,90 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   list-style-image: url("chrome://global/skin/icons/close-inverted.svg");
 }
 
+/* Tab sound indicator */
+.tab-icon-sound {
+  -moz-margin-start: 4px;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+}
+
+.allTabs-endimage[soundplaying],
+.tab-icon-sound[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio");
+}
+
+.allTabs-endimage[muted],
+.tab-icon-sound[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted");
+}
+
+.allTabs-endimage[blocked],
+.tab-icon-sound[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-sound[soundplaying],
+#TabsToolbar[brighttext] .tab-icon-sound[blocked],
+#TabsToolbar[brighttext] .tab-icon-sound[muted] {
+  filter: invert(1);
+}
+
+.tab-icon-sound[soundplaying-scheduledremoval]:not([muted]):not(:hover),
+.tab-icon-overlay[soundplaying-scheduledremoval]:not([muted]):not(:hover) {
+  transition: opacity .3s linear var(--soundplaying-removal-delay);
+  opacity: 0;
+}
+
+/* Tab icon overlay */
+.tab-icon-overlay {
+  width: 16px;
+  height: 16px;
+  margin-top: -8px;
+  margin-inline-start: -15px;
+  margin-inline-end: -1px;
+  position: relative;
+}
+
+.tab-icon-overlay[soundplaying],
+.tab-icon-overlay[muted]:not([crashed]),
+.tab-icon-overlay[blocked]:not([crashed]) {
+  border-radius: 10px;
+}
+
+.tab-icon-overlay[soundplaying]:hover,
+.tab-icon-overlay[muted]:not([crashed]):hover,
+.tab-icon-overlay[blocked]:not([crashed]):hover {
+  background-color: white;
+}
+
+.tab-icon-overlay[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio");
+}
+
+.tab-icon-overlay[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-muted");
+}
+
+.tab-icon-overlay[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-blocked");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[soundplaying]:not([selected]):not(:hover),
+.tab-icon-overlay[soundplaying][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[muted]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[muted][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-muted");
+}
+
+#TabsToolbar[brighttext] .tab-icon-overlay[blocked]:not([crashed]):not([selected]):not(:hover),
+.tab-icon-overlay[blocked][selected]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-blocked");
+}
+
 /* Tab scrollbox arrow, tabstrip new tab and all-tabs buttons */
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
diff --git a/application/palemoon/themes/windows/jar.mn b/application/palemoon/themes/windows/jar.mn
index eb5edb3c1..724bac689 100644
--- a/application/palemoon/themes/windows/jar.mn
+++ b/application/palemoon/themes/windows/jar.mn
@@ -150,6 +150,8 @@ browser.jar:
         skin/classic/browser/tabbrowser/tab-arrow-left-inverted.png  (tabbrowser/tab-arrow-left-inverted.png)
         skin/classic/browser/tabbrowser/tab-overflow-border.png      (tabbrowser/tab-overflow-border.png)
         skin/classic/browser/tabbrowser/tabDragIndicator.png         (tabbrowser/tabDragIndicator.png)
+        skin/classic/browser/tabbrowser/tab-audio.svg                (../shared/tabbrowser/tab-audio.svg)
+        skin/classic/browser/tabbrowser/tab-audio-small.svg          (../shared/tabbrowser/tab-audio-small.svg)
 #ifdef MOZ_SERVICES_SYNC
         skin/classic/browser/sync-throbber.png
         skin/classic/browser/sync-16.png