@Dave , my guess was cache related, though being the same under other circumstances I'd check the hardware related stuff -
hw acceleration and drivers.
https://www.drivereasy.com/knowledge/fix-firefox-freezing-issue/

[–] Dave@lemmy.nz 1 points 3 weeks ago

Cheers, I have disabled the hardware acceleration, and now I'll see if that fixes it!

[–] Dave@lemmy.nz 1 points 3 weeks ago

Hardware acceleration is off, I've cleared all browser data, running the latest version, system is up to date so should have latest drivers, deleted the favicon/places databases.

The only suggestion left on that link is an add on. I've now disabled everything exect uBlock and bitwarden, let's see if that helps. Not holding my breath though!

[–] Dave@lemmy.nz 1 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

(I disabled all addons except uBlock, and the UI still froze. 🤷 🤦 😭 )

[–] Antigrav@mastodon.nz 2 points 3 weeks ago (1 children)

@Dave , darn that is weird. Uninstall, reinstall?
Waterfox? (running out of ideas).
(pi-hole instead of ublock)
When you stop hardware acceleration you have to quit the browser and open it again for it to be effective. Also:
https://www.reddit.com/r/uBlockOrigin/comments/vj5r67/ublock/_origin/_completely/_blows/_up/_pc/_on/

[–] Dave@lemmy.nz 1 points 3 weeks ago

I am regularly closing and opening the browser 😅. I also am sure hardware acceleration was disabled, it was immediately obvious when sites with animated transitions slowed to a crawl.

I might try creating a fresh profile, that should hopefully avoid the risk of previously saved settings being reloaded even after a reinstall.

Waterfox is a good idea too haha. I should try it for a while and see if it has the same issue.