diff --git a/application/palemoon/base/content/browser-sets.inc b/application/palemoon/base/content/browser-sets.inc
index 25794a65ce..78fce26709 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/locales/en-US/chrome/browser/browser.dtd b/application/palemoon/locales/en-US/chrome/browser/browser.dtd
index 2d80c80784..8632b44b46 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">