Anyone else experiecing slow resource loading on Firefox ?

[Pwrfmind]

Hello everybody,

I am using Firefox on my PC and Macbook and both have problems with the latest version. Yesterday I noticed that while watching a YT video on my Macbook was getting super hot and decided to open resource monitor and saw that the CPU usage was sitting at the top all the time. Performed a shutdown for a couple of minutes and restart immediately after hoping it will fix the issue, but unfortunately did not.
Decided to try watching a video with Safari and everything was fine, no throttling and no heat at all. 

Today I noticed on my PC that while starting FF, it needed like 5-7 seconds to load all my bookmarks (strange?), never before I experienced something like that. Opened a YT video and a slideshow on another site and it Froze for around 10 seconds. It's like I was using Pentium 2 Duo all over again haha.

Tried clearing cache, all browsing data, disabling extensions(add-ons), deleting "user_preference" file from the FF folder and nothing works. I am not experiencing such behavior with Edge and Chrome while performing the same tasks and never before had any problems with FF till now. I am thinking it's the newest update that just dropped. It can't be just a coincidence the struggle on both machines. Anyone else experiencing any strange behaviors ?

[siffemcon]

What exactly is in that "user_preference" file?

Do the same problems also happen in [Troubleshoot mode](https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode)?

[Pwrfmind]

Actually the name of the file was content-prefs.sqlite .

I am experiencing the same issues in Troubleshoot mode too.

[siffemcon]

Does that also happen with a clean new profile(https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles)? If not, you could switch back to your broken profile and refresh(https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings) FF there. That will save you some time restoring things.

[Ksenom_O]

Many users are experiencing serious problems with Firefox 137 version. Just read other posts on this discussion forum. (Not the pinned ones by employees, but the new ones.) 👉