After some testing it seems that AD-Block plus extension might be the problem, however i don't know why. There was no update to any of my plugins or extensions recently.

Hey there!

It seems that Adblock Plus is a known as a RAM eater. Try to install uBlock Origin instead of it.

Also see the following website on what to do to fix the performance issue:

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

Hope this helps!

Kind regards,

Bithiah

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

Yea, this topic helped me with nothing. Also when i close process that consumes my whole ram and turn off AD-block extension and turn on again everything works fine.

That's weird though but a lot of people have stopped using the AD-block extension in search for one that doesn't cause so many problems. And how often do you need to turn the AD-block extension on and off to make it work fine?

Just once, however ant video downloader extension don't work when I do this.

Wow, I'm experiencing the same thing. I just flat out removed the Adblock Ultimate after hearing that (still using uBlock Origin). But, Ant Video downloader still doesn't work for me at all. In fact, my entire extensions toolbar feels very sluggish, oftentimes not opening the extension at all.

Ok, turns out the culprit IS Ant Video Downloader.

Check out the latest reviews: https://addons.mozilla.org/en-US/firefox/addon/video-downloader-player/reviews/?utm_content=search&utm_medium=referral&utm_source=addons.mozilla.org

I removed the extension, and that fixed the issues I experienced here: https://support.mozilla.org/en-US/questions/1363515

Hope Ant can fix this, but I won't be using it for now.

Then @assamite1 I think your problem should be solved :)

Hope I helped!

Bithiah

Yea just like Matt said, turns out that Ant Video Downloader extension was the problem. I uninstalled and installed it again and now all is good.