--- a/toolkit/components/passwordmgr/content/passwordManager.xul
+++ b/toolkit/components/passwordmgr/content/passwordManager.xul
@@ -29,16 +29,17 @@
     <key key="&focusSearch2.key;" modifiers="accel" oncommand="FocusFilterBox();"/>
   </keyset>
 
   <popupset id="signonsTreeContextSet">
     <menupopup id="signonsTreeContextMenu"
            onpopupshowing="UpdateCopyPassword()">
       <menuitem id="context-copyusername"
                 label="&copyUsernameCmd.label;"
+                accesskey="&copyUsernameCmd.accesskey;"
                 oncommand="CopyUsername()"/>
       <menuitem id="context-copypassword"
                 label="&copyPasswordCmd.label;"
                 accesskey="&copyPasswordCmd.accesskey;"
                 oncommand="CopyPassword()"/>
     </menupopup>
   </popupset>
 

--- a/toolkit/locales/en-US/chrome/passwordmgr/passwordManager.dtd
+++ b/toolkit/locales/en-US/chrome/passwordmgr/passwordManager.dtd
@@ -28,8 +28,9 @@
 <!ENTITY      windowClose.key                 "w">
 <!ENTITY      focusSearch1.key                "f">
 <!ENTITY      focusSearch2.key                "k">
 
 <!ENTITY      copyPasswordCmd.label           "Copy Password">
 <!ENTITY      copyPasswordCmd.accesskey       "C">
 
 <!ENTITY      copyUsernameCmd.label           "Copy Username">
+<!ENTITY      copyUsernameCmd.accesskey       "U">