Hi Friend, I am developing a Firefox add-on, and for that I have used overlay, now I want that if somebody presses the key like control+j it should open my extension, and if somebody presses ctrl+space it should execute a JavaScript function. I tried this: <keyset id="mainKeyset"> <key id="keyOpen" keycode="VK_J" oncommand="document.getElementById('menuboard').showPopup(document.getElementById('mypanel'), -1, -1, 'popup', 'topleft', 'bottomleft');"/> <key id="keyExecute" modifiers="control" keycode="VK_SPACE" oncommand="javascript:myfucntion();"/> </keyset> But where it's not working what I am missing can anybody help me, please. Thanks, Jaswant