this post was submitted on 11 Aug 2025
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Firefox users report high CPU and memory usage in the latest release, caused by browser's on-device AI inferencing for its 'smart tab grouping' feature.

https://www.omgubuntu.co.uk/2025/08/firefox-high-cpu-usage-inference-disable

#mozilla #firefox #opensource

top 35 comments
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[–] jjjalljs@ttrpg.network 52 points 1 month ago (1 children)

I don't want AI in my browser. I've been a consistent Firefox user for years but this might make me switch to a fork.

[–] sprack@lemmy.world 26 points 1 month ago (5 children)

Under about:config, browser.tabs.groups.smart you can disable it.

[–] jjjalljs@ttrpg.network 25 points 1 month ago

Thanks for reminding me to do this.

I don't really want to have to keep checking the release notes for new AI bullshit, though.

[–] mouse@midwest.social 13 points 1 month ago* (last edited 1 month ago)

There's an option labeled Use AI to suggest tabs and a name for tab groups.

On 141 it's listed in Settings under the General => Tabs section.

It changes browser.tabs.groups.smart.userEnabled.

Looking at it further, either option will disable it. Here's the code that checks both values, https://github.com/mozilla-firefox/firefox/blob/FIREFOX-ANDROID_141_0_3_RELEASE/browser/components/tabbrowser/content/tabgroup-menu.js#L481

[–] Tanoh@lemmy.world 11 points 1 month ago (1 children)

....for now.

That is the standard playbook:

  • Introduce unpopular feature
  • Defend it by saying there is an option in preferences to disable it
  • Later hide the option in some obscure config instead
  • Finally, remove the option to disable it
[–] lime@feddit.nu 2 points 1 month ago* (last edited 1 month ago)

what have they removed so far?

[–] relativestranger@feddit.nl 10 points 1 month ago (1 children)

there used to be a more accessible toggle in settings for that. why tf would they take that out?

[–] Oisteink@feddit.nl 10 points 1 month ago

To keep most users from disabling it. Just like why the don’t make it opt in.

[–] remon@ani.social 8 points 1 month ago

Also everything that starts with "browser.ml.chat".

[–] chesheer@mastodon.bsd.cafe 21 points 1 month ago

@omgubuntu@floss.social Who the hell needs AI to group tabs? It's so absurd!
This is why we can't have nice things.

[–] pertho@mastodon.bsd.cafe 17 points 1 month ago

@omgubuntu@floss.social Yay. More AI crap to turn off. Just what we needed. Thanks, Mozilla.

[–] mariu5@ruhr.social 10 points 1 month ago

@omgubuntu@floss.social what is mozilla supposed to do? Inferencing is resource intensive by nature. Doing this in the cloud and users would complain about privacy. Not doing it at all and users would complain about Firefox feeling old and complicated

[–] weston@techhub.social 9 points 1 month ago

@omgubuntu@floss.social I can't wait for this bubble to pop. The suspense is killing me.

[–] Vincent@feddit.nl 7 points 1 month ago (1 children)

Here's the bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1982278#c4

It does not appear to be caused by smart tab grouping (which you also have to actively enable yourself).

[–] HubertManne@piefed.social 7 points 1 month ago (1 children)

it was enabled for me and I just took it off. I ever enabled it so it must be default to have it on.

[–] Vincent@feddit.nl 1 points 1 month ago (1 children)

If by "enabled" you mean you saw a button "Suggest more of my tabs", then I believe that is present by default, but I believe it only downloads the model when you actually press that button for the first time. At least it did for me.

It's possible that I'm misunderstanding what it does otherwise though. Still, does not appear to have been the cause of this particular issue.

[–] HubertManne@piefed.social 2 points 1 month ago (1 children)

nope. literally says "Use AI to suggest tabs and a name for tab groups" and the slider was activated and I flipped it to off. Never saw a download but when it updates firefox either has to be closed or it restarts.

[–] Vincent@feddit.nl 1 points 1 month ago (1 children)

Weird, I don't even see a slider! Perhaps we're in different testing groups or something.

[–] HubertManne@piefed.social 1 points 1 month ago (1 children)

im on linux and using what I think is bog standard firefox with a few addons.

[–] Vincent@feddit.nl 1 points 1 month ago (1 children)

Same! But I think people are just randomly sorted in buckets to see how some experiments land.

[–] HubertManne@piefed.social 1 points 1 month ago (1 children)

I am on an lts kernel (ubuntu) to. not sure if that would make a difference.

[–] Vincent@feddit.nl 1 points 1 month ago

I doubt it, but yeah - Fedora Silverblue here, who knows.

[–] justin@toot.io 4 points 1 month ago

@omgubuntu@floss.social #SwitchToLibrewolf

[–] 1024Bytes@masto.ai 4 points 1 month ago

@omgubuntu@floss.social Thankls, not noticed AI sneaked in. because i have the sidebar removed. AI and other sidebar stuff disabled in settings. And.. remove doffcourse that useless annoying sidebar again.

[–] scytale@piefed.zip 4 points 1 month ago (1 children)

Yeah it's been incredibly slow in macOS and Linux. Bitwarden has also been slow but I'm not sure if it's FF that's causing it. It's slowly becoming a bloated mess.

[–] kroko@piefed.world 1 points 1 month ago* (last edited 1 month ago)

True, Bitwarden adon have been buggy in the last few days.

[–] apzpins@mstdn.games 3 points 1 month ago

@omgubuntu@floss.social Odd, this was disabled by default on mine. I had already started to wonder if they'd find a new way to cause grief.

[–] darcmage@lemmy.dbzer0.com 3 points 1 month ago

I didn't realize it was out. I'm guessing it's a phased rollout with windows users being first in the test group? None of my linux machines have it enabled by default.

[–] toddz@social.linux.pizza 2 points 1 month ago

@omgubuntu@floss.social THANK YOU! The last update made Firefox unusable even on my fairly capable desktop but I hadn’t figured out why.

[–] vintprox@techhub.social 1 points 1 month ago

@omgubuntu@floss.social Fucking Mozilla, man!

[–] zeroase@fosstodon.org 1 points 1 month ago

@omgubuntu@floss.social I can only recommend switching to Firefox ESR. It's the same old Firefox, but without the monthly brain farts.

[–] aemstuz@pol.social 1 points 1 month ago

@omgubuntu@floss.social So good I've moved to Vivaldi recently 😌

#Vivaldi

[–] quincy@chaos.social 1 points 1 month ago

@omgubuntu@floss.social

🤦

[–] Kommentator@muenchen.social 1 points 1 month ago (1 children)

@omgubuntu@floss.social
Time to switch to vivaldi

[–] Hansae@lemmy.dbzer0.com 2 points 1 month ago

Vivaldi is barely any better, its based on chrome.