Comment 1 for bug 645836

Thanks for reporting this Elie. What version of Firefox are you using?

It is possible that the keys are not responding because of a lack of focus. In order for any of the keyboard shortcuts to work, the document must have focus. The easiest way to do this is to simply left-click some unused portion of the web-page, then try using the shortcut. Does that work for you? Unfortunately I don't think there is too much I can do about that issue other than to try and let the users know, this is just another limitation of web applications.