After being forced to update to Firefox Quantum, I:
- downloaded Firefox 52.9.0 ESR
- toggled
xpinstall.signatures.required
inabout:config
fromtrue
tofalse
But even when most XUL add-ons work again, in Tree Tab Style and Reddit Enhancement Suite I have this error:
In previous times when I have to downgrade Firefox, I've never seen this. All I need is to do (2) and all is good. Googling the problem yields no result. How can I fix this?
Unfortunately, not all Firefox addons are supported in Pale Moon. I can't use Waterfox too, because it doesn't support 32-bit machines.
Best Answer
That's because when Firefox updated it also updated the addons. Later versions of them are simply incompatible with Firefox 52. Visit the old version of Tree Tab Style and RES to install them.