--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -7577,16 +7577,26 @@ var TabContextMenu = {
     let bookmarkAllTabs = document.getElementById("context_bookmarkAllTabs");
     bookmarkAllTabs.hidden = this.contextTab.pinned;
     if (!bookmarkAllTabs.hidden)
       PlacesCommandHook.updateBookmarkAllTabsCommand();
 
     // Hide "Move to Group" if it's a pinned tab.
     document.getElementById("context_tabViewMenu").hidden =
       (this.contextTab.pinned || !TabView.firstUseExperienced);
+
+    // 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");
+    }
   }
 };
 
 XPCOMUtils.defineLazyModuleGetter(this, "gDevTools",
                                   "resource:///modules/devtools/gDevTools.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "gDevToolsBrowser",
                                   "resource:///modules/devtools/gDevTools.jsm");

--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -78,16 +78,17 @@
 #undef FULL_BROWSER_WINDOW
 
   <popupset id="mainPopupSet">
     <menupopup id="tabContextMenu"
                onpopupshowing="if (event.target == this) TabContextMenu.updateContextMenu(this);"
                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;"
                 oncommand="gBrowser.pinTab(TabContextMenu.contextTab);"/>
       <menuitem id="context_unpinTab" label="&unpinTab.label;" hidden="true"
                 accesskey="&unpinTab.accesskey;"
                 oncommand="gBrowser.unpinTab(TabContextMenu.contextTab);"/>
       <menu id="context_tabViewMenu" label="&moveToGroup.label;"

--- a/browser/base/content/test/general/browser_audioTabIcon.js
+++ b/browser/base/content/test/general/browser_audioTabIcon.js
@@ -71,16 +71,37 @@ function* test_mute_tab(tab, icon, expec
 }
 
 function get_tab_attributes(tab) {
   const ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
   let {attributes} = JSON.parse(ss.getTabState(tab));
   return attributes;
 }
 
+function* test_muting_using_menu(tab, expectMuted) {
+  // Show the popup menu
+  let contextMenu = document.getElementById("tabContextMenu");
+  let popupShownPromise = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(tab, {type: "contextmenu", button: 2});
+  yield popupShownPromise;
+
+  // Check the menu
+  let expectedLabel = expectMuted ? "Unmute Tab" : "Mute Tab";
+  let toggleMute = document.getElementById("context_toggleMuteTab");
+  is(toggleMute.label, expectedLabel, "Correct label expected");
+  is(toggleMute.accessKey, "M", "Correct accessKey expected");
+
+  // Click on the menu and wait for the tab to be muted.
+  let mutedPromise = get_wait_for_mute_promise(tab, !expectMuted);
+  let popupHiddenPromise = BrowserTestUtils.waitForEvent(contextMenu, "popuphidden");
+  EventUtils.synthesizeMouseAtCenter(toggleMute, {});
+  yield popupHiddenPromise;
+  yield mutedPromise;
+}
+
 function* test_playing_icon_on_tab(tab, browser, isPinned) {
   let icon = document.getAnonymousElementByAttribute(tab, "anonid",
                                                      isPinned ? "overlay-icon" : "soundplaying-icon");
 
   yield ContentTask.spawn(browser, {}, function* () {
     let audio = content.document.querySelector("audio");
     audio.play();
   });
@@ -115,16 +136,22 @@ function* test_playing_icon_on_tab(tab, 
      !tab.hasAttribute("soundplaying"), "Tab should still be muted but not playing");
 
   yield test_tooltip(icon, "Unmute tab");
 
   yield test_mute_tab(tab, icon, false);
 
   ok(!tab.hasAttribute("muted") &&
      !tab.hasAttribute("soundplaying"), "Tab should not be be muted or playing");
+
+  // Make sure it's possible to mute using the context menu.
+  yield test_muting_using_menu(tab, false);
+
+  // Make sure it's possible to unmute using the context menu.
+  yield test_muting_using_menu(tab, true);
 }
 
 function* test_swapped_browser(oldTab, newBrowser, isPlaying) {
   ok(oldTab.hasAttribute("muted"), "Expected the correct muted attribute on the old tab");
   is(oldTab.hasAttribute("soundplaying"), isPlaying, "Expected the correct soundplaying attribute on the old tab");
 
   let newTab = gBrowser.getTabForBrowser(newBrowser);
   let AttrChangePromise = BrowserTestUtils.waitForEvent(newTab, "TabAttrModified", false, event => {

--- a/browser/locales/en-US/chrome/browser/browser.properties
+++ b/browser/locales/en-US/chrome/browser/browser.properties
@@ -766,8 +766,13 @@ e10s.offerPopup.noThanks.accesskey = N
 e10s.postActivationInfobar.message = You're now helping to test multi-process in %S! Please report problems you find.
 e10s.postActivationInfobar.learnMore.label = Learn More
 e10s.postActivationInfobar.learnMore.accesskey = L
 e10s.accessibilityNotice.mainMessage = Multi-process does not yet support accessibility features. Multi-process will be disabled if you restart %S. Would you like to restart?
 e10s.accessibilityNotice.disableAndRestart.label = Disable and Restart
 e10s.accessibilityNotice.disableAndRestart.accesskey = R
 e10s.accessibilityNotice.dontDisable.label = Don't Disable
 e10s.accessibilityNotice.dontDisable.accesskey = D
+
+muteTab.label = Mute Tab
+muteTab.accesskey = M
+unmuteTab.label = Unmute Tab
+unmuteTab.accesskey = M