--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -4548,19 +4548,24 @@
           } else if (tab._overPlayingIcon) {
             let stringID;
             if (tab.selected) {
               stringID = tab.linkedBrowser.audioMuted ?
                 "tabs.unmuteAudio.tooltip" :
                 "tabs.muteAudio.tooltip";
               label = stringWithShortcut(stringID, "key_toggleMute");
             } else {
-              stringID = tab.linkedBrowser.audioMuted ?
-                "tabs.unmuteAudio.background.tooltip" :
-                "tabs.muteAudio.background.tooltip";
+              if (tab.linkedBrowser.audioBlocked) {
+                stringID = "tabs.unblockAudio.tooltip";
+              } else {
+                stringID = tab.linkedBrowser.audioMuted ?
+                  "tabs.unmuteAudio.background.tooltip" :
+                  "tabs.muteAudio.background.tooltip";
+              }
+
               label = this.mStringBundle.getString(stringID);
             }
           } else {
             label = tab.getAttribute("label") +
                       (this.AppConstants.E10S_TESTING_ONLY && tab.linkedBrowser && tab.linkedBrowser.isRemoteBrowser ? " - e10s" : "");
           }
           event.target.setAttribute("label", label);
         ]]></body>

--- a/browser/locales/en-US/chrome/browser/tabbrowser.properties
+++ b/browser/locales/en-US/chrome/browser/tabbrowser.properties
@@ -39,11 +39,13 @@ tabs.closeSelectedTab.tooltip=Close tab 
 # %S is the keyboard shortcut for "Mute tab"
 tabs.muteAudio.tooltip=Mute tab (%S)
 # LOCALIZATION NOTE (tabs.unmuteAudio.tooltip):
 # %S is the keyboard shortcut for "Unmute tab"
 tabs.unmuteAudio.tooltip=Unmute tab (%S)
 tabs.muteAudio.background.tooltip=Mute tab
 tabs.unmuteAudio.background.tooltip=Unmute tab
 
+tabs.unblockAudio.tooltip=Play tab
+
 # LOCALIZATION NOTE (tabs.allowTabFocusByPromptForSite):
 # %S is the hostname of the site where dialogs are allowed to switch tabs
 tabs.allowTabFocusByPromptForSite=Allow dialogs from %S to take you to their tab