[DamienBourg]

Thks, it worked, I installed the fix. But do I have to uninstall the .xpi after? And how? Also, my addons are back, but I still have the error message (see screenshot: http://i.imgur.com/t1wb316.png ) Also do I still have to allow the "allow firefow to install and run studies"? Thks.

[gpm]

I don't see any reason that you need to uninstall the .xpi, but you might as well. See here (hoping someone replies there with a better method of uninstalling, my method is a bad hack) https://news.ycombinator.com/item?id=19827428

You don't need to allow firefox to install and run studies, that's just a way of letting firefox automatically install this xpi.

Did that error message only appear after you installed the .xpi fix? If so it's mildly worrisome, but probably not worth spending time figuring out what it's about if all your addons are back. If it appeared when the addons were initially disabled it's not an issue at all, it's just that nothing closed it.

[DamienBourg]

"You don't need to allow firefox to install and run studies, that's just a way of letting firefox automatically install this xpi."

In that case I am wondering why Mozila didn't provide a direct link...it would have been faster. Maybe there is another reason to ask us to run studies...wondering.

[DamienBourg]

"If it appeared when the addons were initially disabled it's not an issue at all, it's just that nothing closed it.

Yes, it appeared when the addons were initially disabled.