requestFullscreen is not returning a promise...

Inspecting firefox with firebug...

How to debug a Firefox extension with Chromebug?...

How to prevent a text from appearing up in firebug or View Source of browser...

Firefox SDK Extension Builder - inspecting / debugging html and dom of panels...

Debugging tools for Firefox extension development...

Equivalent of Firebug for Thunderbird...

Debug javascript of firefox extension in Firebug...

View chrome source in Firefox...

How to get the stack trace from errors in a FireFox extension?...