Transparency not working in firefox 88.0 linux

[dhushyanth-s]

Distro: Manjaro latest
DE: KDE
Version: Firefox stable 88.0

user.js is present, theme chosen is blurred in userChrome.css, installed through script, nothing changed. Still the window looks like this

As you can see, it has no transparency. I have force blur running and blur enabled. I have also tried reinstalling firefox but didn't change a thing.

[eromatiya]

#60