Transparency non-existant now in Firefox 85

[vladimirlucifer]

I can't really include any photos (i don't really have a screenshot manager), however, the background is no longer transparent. The search sugestions menu somehow is, however the background, tabs and the likes of it no longer are after updating firefox. Is there any fix?

[Mange]

Duplicate of #48

[Neightro]

Also noticed this after the update, thought it's working properly on Plasma on a different machine with Firefox 85. Reinstalling Firefox might be the only feasible option, as tweaking the CSS seems not to fix it. I'll try that later and update here whether or not that fixes anything.

Edit:Comparing betweenabout:config for a fresh a fresh reinstall of Firefox 84, and Firefox 85 on Arch Linux with KDE (the environment where it works), there is no obvious setting change that should cause it not to work.

The Firefox devs appear to be working on the new Proton UI, as there is a new setting for that ('browser.proton.enabled', defaults false as of 85.0). It's possible that they broke something to do with the renderer while working on it.

[Dartegnian]

I can vouch for the transparency working on Plasma but it doesn't work on any picom or picom-fork compositor. I have Plasma and bspwm+compton-tryone-git installed. Upon switching to KDE, Firefox supports transparency. But when I switch to bspwm, there's a gray background behind the address bar and tabs. Same browser, same settings, but different behavior on different compositors.

[Neightro]

Still broken on 85.0.2. I'll have to see if anyone has reported this on Firefox's bug tracker; if not, then I might have to look into doing that myself.