Hello,
So I'm using Firefox Aurora 35.0a2 (2014-11-04) and Firebug 2.0.4. I see a pop-up saying that I can try out a Firebug 3 alpha. Sounds super cool.
Firebug 3 alpha is available for testing. With multiprocess Firefox (e10s) it will offer performance, stability and security advantages. It is based on the built-in Firefox developer tools so Firebug 2 addons don't work just yet. Do you want to try it out?
I chose Yes and now whenever I press F12 I'm stuck with the attached screenshot where I cannot cancel it.
Anyone else stuck here? I think I'll try uninstalling and rolling back to 2.0.4
Cheers
Gavin