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

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[–] 48 points 1 year ago (8 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.

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  • [–] 23 points 1 year ago (7 children)

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

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  • [–] 11 points 1 year 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

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  • [–] 20 points 1 year 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.

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  • [–] 16 points 1 year ago

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

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  • [–] 9 points 1 year 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

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  • [–] 8 points 1 year ago

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

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  • [–] 7 points 1 year ago (8 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).

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  • [–] 6 points 1 year ago (7 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.

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  • [–] 1 point 1 year ago (6 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.

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  • [–] 2 points 1 year ago (5 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.

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  • [–] 1 point 1 year ago (4 children)

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

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  • [–] 1 point 1 year ago (3 children)

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

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  • [–] 1 point 1 year ago (2 children)

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

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  • [–] 4 points 1 year ago (1 child)

    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.

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  • [–] 4 points 1 year 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.

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  • [–] 4 points 1 year ago
    [–] 3 points 1 year 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.

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  • [–] 3 points 1 year 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.

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  • [–] 2 points 1 year ago

    @omgubuntu@floss.social Since this upgrade, Firefox routinely crashes on startup and freezes once it does finally load. Takes about 5 minutes now just to open on my end.

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  • [–] 2 points 1 year 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.

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  • [–] 2 points 1 year ago

    @omgubuntu@floss.social

    'Running down battery life' over millions upon millions of devices is a massive energy suck.

    It is not trivial.

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  • [–] 1 point 1 year ago
    [–] 1 point 1 year ago

    @omgubuntu@floss.social Well, better than running it on the cloud. Still, this is a great reason to switch to a firefox derivate like Librewolf or Floorp.

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  • [–] 1 point 1 year ago

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

    #Vivaldi

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  • [–] 1 point 1 year ago

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

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  • [–] 1 point 1 year ago
    [–] 1 point 1 year ago (1 child)
  • [–] 1 point 1 year ago

    @omgubuntu@floss.social I'm so sick and tired of having to wade through about: config to disable poorly implemented stuff

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