This has been a bug for a long time but devs have never reproduced and don't know what causes it.

https://bugzilla.mozilla.org/show_bug.cgi?id=2034677

Users report that it fixes after some kind of restart. You can try, in order:

• Restarting the browser.
• Restarting the browser in "troubleshoot mode" then restarting it again into normal mode.
• Restarting the whole computer.

Elements blocked. Mission accomplished.

Does anyone else feel like Firefox is running kind of sluggish recently? I'm using Zen browser on Zorin OS. I feel loading times for everything has increased in the last couple of weeks. Element like volume sliders and such aren't responsive for like 5-10 seconds.

Not sure if it's my system or not but other apps run fine. I've already done optimizations in about:config but I havent tried switching browser, because I don't want to, I like Zen browser.

I'm having lots of performance issues after the last update. It seems to be getting slower with each update, sadly.