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back to article Mozilla's Firefox 145 is heeeeeere: Buffs up privacy, bloats AI

Firefox 145 is out, with more privacy, better profile handling, better image search for Google users… and, almost inevitably, more LLM bot integration. Mozilla has released Firefox 145. The release notes in that link make an interesting contrast with the snazzy What's new page which users see on installing the update. Setting …

  1. Anonymous Coward
    Anonymous Coward

    Provided they don't renable things like about:config browser.ml.chat.enabled [false] then my only problem with the AI infestation of my browser is they could have been spending more time on things users actually want.

    I wonder if being bank-rolled by TheBigEvil(tm) is what drives their obsession with LLMs.

    1. cdegroot

      Mozilla's sole mission these days is to shield Google from antitrust cases, the rest dies not matter. Too bad, it was fun while it lasted. On to a WebKit browser, then, I guess?

      1. williamyf Silver badge

        ¿Why go to WebKit? Apple has it severely behind standards wise, and relaying on a bunch of propiertary TAGs.

        Hold on for dear life to FireFox, and jump to Ladybird when is more mature.

        It has a really new renderer. A really new security foundation. And license diversity*, as it is BSD, instead of the Majority GPL that is the WebKit/Blink ecosystem.

        * Diversity is good, monocultures are bad, this is true for biological entities, OS, Userland software, and FOSS licenses as well. As well as is FOSS compatible... I'm OK. In fact, I tend to gravitate towards (and recomend) BSD/MIT/APACHE licenses whenever possible.

      2. Eric 9001

        Chrome is arguably a WebKit browser - although google has made many, many changes to webkit.

        The only sane choices now seem to be netsurf, lynx, w3m or Emacs web wowser - too bad such HTML engines don't implement functionality where incorrect HTML is fixed up and rendered anyway, meaning many sites won't work.

  2. Neil Barnes Silver badge

    Perplexity removed from the search engine list, and my aren't there a lot of browser.ml.chat... options to be disabled?

    1. RachelG

      browser.ml.enable and browser.ml.chat.enabled. i think that's all that's necessary to turn it off.

      1. wolfetone Silver badge

        I use Librewolf and checked it's about:config - on mine at least, browser.ml.enable was true and browser.ml.chat.enabled was false.

        Surprised at it being enabled really.

      2. Alumoi Silver badge

        You ALWAYS disable all of them, just to be sure. If you don't see them it doesn't mean they are not active in the background.

        You know, just like the crashreporter.exe. You can disable it but it always runs. So, you disable it, close Firefox, delete the programs, start Firefox.

    2. Zurich Gnome

      Thanks

      Many thanks for the pointer to the browser.ml. keys (and to Liam for the pointer to Perplexity showing up the the seach engine list).

      Wouldn't it be nice, if ... Mozilla expended some effort on actually documenting the smorgasbord of about:config settings, and published this information somewhere, like, oh I don't know, perhaps on a web site? And then made it a hard rule that developers kept this list up to date, and included a list of changes in the release notes.

      Sure, this is irrelevant to at least 95%+ of people who browse the web. (Remind me what is Firefox's current market share, again?)

      1. ThatOne Silver badge

        Re: Thanks

        > Perplexity showing up

        I've noticed the unrequested appearance this aptly-named search engine days ago, and was indeed perplexed.

        But I immediately trashed it, without even trying to learn what it is, because of the simple rule that something which appears without asking is bound to be harmful (to me) in some way. If it was beneficial to me I would had needed to beg on my knees to get it. Simple.

    3. Dan 55 Silver badge

      I think a couple of AI settings are outside of the browser.ml hierarchy.

      Time for me to plug yet again my fantastic idea of an AI page in settings with switches for all AI features. If nothing else, it would give the user more sense of control over what AI features exist and the reassurance that they can turn it all off if they want.

  3. Dave559

    Firefox Profiles

    That's good to see that Mozilla haven't forgotten about Profiles (firefox --new-instance -P FTW!), I had thought that their scatterbrained attention had seemed to be much more on "container tabs" of late as a (different) way to keep your different web activities separate? (I still prefer the more definite certainty of different instances of Firefox running different profiles, to be absolutely sure that nothing inadvertently leaks between tabs in just one instance.)

    They do seem to have a rather jumbled up approach to things sometimes, with it almost seeming that different development teams work on separate approaches without much or any internal communication at all: see also Bookmarks, with (as long-time users will surely have noticed) the Bookmarks toolbar falling out of and back into favour at different times, a Bookmarks menu, a completely bizarre "Other Bookmarks" section, a Bookmarks menu/toolbar-icon-thing coming and going, etc, etc…)

    1. williamyf Silver badge

      Re: Firefox Profiles

      Most non-reg-reading normies use one profile only. Most users of userland software (firefox included) are non-reg-reading normies. Even some Reg-reader-non-normies

      (me included) use a single profile.

      Container tabs are a good fit for people using one profile only.

      Also, using multiple profiles on mobile browser is harder than in desktop UX wise... (yes, I also use FireFox on android. ¡uBlock Origin + m.youtube.com + m.facebook.com for the win! "¡Look ma' , no ads on mobile!")

      So, good to have both available.

    2. Charlie Clark Silver badge

      Re: Firefox Profiles

      I've just started using profiles: different ones for me and clients, this is especially useful with different password managers in use. However, them all sharing the same icon and unpredictable behaviour when links are clicked is a major annoyance. The new controls via the account symbol also don't seem to be available on MacOS yet.

  4. Rich 2 Silver badge

    AI

    So the most important question - what do I have to do to completely disable (pref remove but I know that’s asking too much) all the AI shite. I’m not convinced that removing a search engine from the search engine list will stop your data being hoovered up

    1. Liam Proven (Written by Reg staff) Silver badge

      Re: AI

      > what do I have to do to completely disable all the AI shite

      I tried to cover that in this one:

      https://www.theregister.com/2025/08/13/firefox_ai_scoffing_power/

      1. bombastic bob Silver badge
        Megaphone

        Re: AI

        If you ask me, there ought to be a choice, grok vs OpenAI etc. or NONE.

      2. speleothem

        Re: AI

        Thanks for that, but there are a few problems with that approach:

        1) There are at least four harmful AI features that are outside the browser.ml hierarchy, so you may need to set ~8-10 additional about:config entries to 'false'. Examples include the browser.tabs.groups.smart group, browser.translations.automaticallyPopup, and browser.urlbar.quicksuggest.mlEnabled. Given Mozilla’s statements about AI, the number will grow with every update. It’s a game of whack-a-mole.

        2) I’ve found that the AI settings often silently reset themselves to 'true' without user interaction. Sometimes on a short timescale (seconds), sometimes on a slow timescale (weeks). The fast resets are probably due to a bug in the Firefox code; I suspect the slow resets are a side effect of updates. One commenter suggested a remedy: locking the settings using either a policies.json file or AutoConfig, see https://support.mozilla.org/en-US/questions/1530298

        And then there’s the big picture: Mozilla’s leadership views browsers as being sooo 1990 – anyone who’s lebenswürdig will soon only interact with the internet through AI. Therefore, the only valid reason for maintaining Firefox is to advertise Mozilla’s AI products (and as antitrust insurance for Mozilla’s main funder, Google). I fear that soon, the only discoverable features in Firefox will be AI products and any remaining browser-related functions will be deeply buried in nested mystery-meat hamburger menus. Already, several useful browser-related functions are randomly distributed among three parallel hamburger menus. Already, the distinction between the URL field and the search field is blurred. And then there’s the weird, counterintuitive detached tabs, which seem to be preparation for the AI “smart” tabs feature.

    2. RobThBay

      Re: AI

      Use the pre-AI ESR version. I'm staying with the ESR version.

    3. speleothem

      Re: AI

      > your data being hoovered up

      While that’s a huge problem in general, in the case of AI in Firefox it’s not the main problem – As far as I’m aware, most of the AI features in Firefox use client-side processing alone, so no user data leaks out. I don’t know of any evidence that Firefox sells user data other than the easily-avoided Google search and of course the Truth Social partner Perplexity AI [1], which brazenly ignores not just ethics, but also the law [2]. Firefox collects general usage data and crash reports, but both are opt-out.

      The big problem with AI in Firefox is the enshittification of the user experience. AI features are shoved in the user’s face at every turn, while routine browser functions are degraded to make room for AI. Some AI features add clutter to the user interface. Some AI features actively throw roadblocks in the user’s way. And some AI features are actively harmful to the user. And all AI features waste users’ computing resources if the user doesn’t specifically want AI. If Mozilla had come up with a valid use case for AI in a browser, then OK, include it as an add-on. But as far as I can tell, Mozilla hasn’t been able to come up with a valid use case for AI.

      And there’s a much bigger problem with commercial LLMs: They’re thermonuclear weapons aimed at the heart of democracy, no MechaHitler required. Welcome to the Borg! Getting into the reasons why would result in much too lengthy a post.

      [1] https://www.nytimes.com/2025/11/04/business/right-wing-chatbots-gab-arya-chatgpt-gemini.html

      [2] https://www.pcmag.com/news/cloudflare-perplexity-ai-acts-like-north-korean-hackers-ignores-scraping

  5. Brave Coward Bronze badge

    One thing about Firefox

    There's one thing in Firefox that I really would like to be implemented.

    On an Ubuntu desktop (or any Gnome-made I guess), you're supposed to be able to move any app window to another workspace by right-clicking on its titlebar and chose "move to the left | right workspace". For some reason, this is impossible with FF : right-click would pop a FF context menu, *not* the system one.

    Which I find rather boring.

    1. LionelB Silver badge

      Re: One thing about Firefox

      I think that depends on your window manager. I can certainly do that with mine (Fluxbox - also works, I think, with Xfce). Perhaps an Ubuntu/Gnome issue?

      1. Missing Semicolon Silver badge

        Re: One thing about Firefox

        This is why Client-side decorations are an abomination. The app author is free to ignore the standard library for the title bar and do their own. And - what kind of knuckle-dragger wants borders on their windows? /sarc

    2. takno

      Re: One thing about Firefox

      I get the proper right click menu if I click in the (fairly tiny) space around min/max/close buttons. It's less that the Gnome context menu is disabled and more that most of the whitespace belongs to the tab-bar for some reason.

      1. johnandmegh

        Re: One thing about Firefox

        Sounds like an instance of one of the basic problems with headerbars: https://pointieststick.com/2019/03/06/more-on-headerbars-rebuttals/

    3. Neil Barnes Silver badge

      Re: One thing about Firefox

      Mint Cinnamon gives me the expected context menu including 'move to another workspace >'.

    4. brainwrong Bronze badge

      Re: One thing about Firefox

      running waterfox (derived from firefox) on cinnamon desktop, the first right-click brings up the application's menu, a second right click replaces it with the system's menu, so I can move it to another workspace.

    5. Liam Proven (Written by Reg staff) Silver badge

      Re: One thing about Firefox

      > right-clicking on its titlebar

      Is your copy configured to have a title bar at all?

      Right click the main toolbar, click _Customise_ and look right at the bottom. There should be a ticky box for "Title bar".

      1. Brave Coward Bronze badge

        Re: One thing about Firefox

        @brainwrong, Liam:

        Both solutions works. But Liam's one, although sort of canonical (no pun intended... or is it?), has the inconvenience of eating some vertical space for not much other purpose. So I'll stick with the double-right-clic - a solution an old fart like me wasn't previously aware of (hey, I'm still trying to process center-clic...)

        Anyway : big thanks to both!

        1. brainwrong Bronze badge

          Re: One thing about Firefox

          What does centre click do, other than being the first part of the mouse to fail?

          It's often said here that doing the same thing again and expecting a different outcome is foolish, but that doesn't stop me. It's sometimes wrong.

      2. RegGuy1
        Facepalm

        Re: One thing about Firefox

        You have to laugh that they put the customise toolbar on the next page, when you click on the settings hamburger at top right: you must first click on more tools.

        The very first thing I always do with a new instance/profile is to get the bloody menu back. Which idiot thought that removing the menu was a good idea? Just coz those numpties at Google did it doesn't mean you have to copy them.

    6. ThatOne Silver badge
      Coat

      Re: One thing about Firefox

      Well, show me the way

      To the next title bar

      Oh don't ask why

      Oh don't ask why

      ...

      Yeah, yeah, I'm leaving... :-D

  6. heyrick Silver badge
    Mushroom

    F[poop]k Perplexity

    Bloody thing spammed my website something terrible. I blocked it by user agent and it came back with a slightly changed one. Blocked that, and now I'm getting spammed by a user agent that looks like a regular user only following the same behaviour. I don't want their shit in my browser, I want their heads mounted on poles along the Seine.

    Icon, because why, of all the automated bullshit spewers, did they chose to align themselves with that one?

    1. Ian 55

      Re: F[poop]k Perplexity

      OpenAI was visiting one page on a website I sysadmin for seven times a second.

      Didn't matter that the page changed about once a year.

      AI is a conspiracy to get Cloudflare in front of every website that doesn't self-host an anti-bot system.

  7. LionelB Silver badge

    PDF comments

    > PDF files can do this too, but you could be forgiven for not noticing, as it's an extra feature that many basic PDF viewers don't support. In his late 20-teens, this vulture spent hours a month on PDF comments, and at that time, KDE's Okular was the only Linux PDF viewer we could find that could handle them.

    That used to (and to some extent still does) drive me nuts. I'm not sure, but I think that, at least in the past, there was no official standard for PDF comments, so different PDF applications/viewers implemented their own commenting mechanisms and formats - which would likely not work well (or at all) with a different viewer. The situation does seem to have approved somewhat over the years, but I still find myself regularly seeing black blobs, unclickable doodahs, glitchy formatting or... nothing at all, until I find a viewer that works (for that particular document).

  8. Blackjack Silver badge

    [Buffs up privacy, bloats AI]

    That's like saying "Put a padlock in the door but left the window open."

    1. cd Silver badge

      Choirboy gets new haircut, but

      ...caught fucking sheep.

      1. Bebu sa Ware Silver badge
        Coat

        Re: Choirboy gets new haircut, but

        ...caught fucking sheep.

        That's what ewes say !

        Don't bother I know the way…

  9. Anonymous Coward
    Anonymous Coward

    I'd have hoped by now that the idea of marketing something as "AI Free" would be seen as a positive. But not yet it seems.

    1. johnandmegh

      It's a big attraction point for Vivaldi, at least for me.

      1. Eric 9001

        Vivaldi cannot be trusted as it's proprietary software - they even admit that it's spyware; https://vivaldi.com/privacy/browser/

        1. breakfast Silver badge

          Call me old Mr Literacy, but I can't see that as a confession of spyware. They say their browser does an analytics check, uses cookies, offers some sponsored links on the homepage, and that if you use search suggestions it will send those requests to your search engine of choice. "That means it's spyware" is quite a leap. If anything the built-in adblock-by-default means that without any extra configuration Vivaldi is way less spywareish than most other browsers off the shelf.

  10. Anonymous Coward
    Anonymous Coward

    Who edits PDFs in their browser when there are perfectly good (better) apps that also render the document accurately?

    1. Anonymous Coward
      Anonymous Coward

      Those who don''t have those apps?

    2. DS999 Silver badge

      If you're using Linux

      It is much more convenient to use Firefox for light editing or fill in forms than to go looking for a PDF editing app. Sure if you're on Windows and editing PDFs is something you need to do regularly and you need perfect document accuracy you're gonna buy Acrobat. That's not available on Linux.

      1. Eric 9001
        Mushroom

        Re: If you're using Linux

        Okular and evince installed on GNU are much more convenient that firefox's slow JS pdf viewer.

        acrobat does not give perfect document accuracy - as I've seen it sabotage the output pdf to replace the pages telling the receiver to install "adobe viewer" to view the document (it turns out GNU Ghostscript could remove such sabotage).

        I've also seen acrobat fail to add or edit pdf comments, meanwhile okular just worked with the same pdf.

  11. El.Mich.

    If anything nasty in Firefox wait for the corresponding version of LibreWolf

    Or even take a closer look at PaleMoon! Among several other interesting features, at least in my opinion, there is the ηMatrix-addon:

    https://addons.palemoon.org/addon/ematrix/

    Unfortunately though still understandably Raymond Hill had stopped the further development of μMatrix quite some time ago but PaleMoon and / or Mr. Alessio Vanni stepped right into the gap and simply delivered ...! :-) THANKS A LOT! :-)

    All Chromium-based browsers will most likely share the same fate as Chrome itself regarding Manifest v.2 vs. Manifest v.3. :-( Of course Brave as well as Vivaldi do offer very interesting features but they both will most likely have to endure this massive cut of features regarding security and privacy. :-(

  12. Anonymous Coward
    Anonymous Coward

    Meanwhile it gets less and less reliable at correctly rendering websites.

    1. Hubert Cumberdale Silver badge

      Meanwhile it gets less and less reliable at correctly rendering websites web designers get increasingly lazy and design websites that don't follow standards and only work in Chrome.

      FTFY.

      1. ThatOne Silver badge
        Unhappy

        Yes, unfortunately. History repeats itself, as usual. I'm old enough to remember the "Best viewed in MSIE" times, and I do not welcome their return.

    2. El.Mich.

      I really urgently do hope that You will read and hopefully understand too the comment by "Hubert Cumberdale"!

      Of course I do not know how long You have been online and "watching the web" and its development. But let me assure You that in the not so long ago earlier days so-called web-designers much too often "optimised" their sites by only testing them against Microsoft's so-called "Internet Explorer" and much too often ignoring standards in HTML, CSS, JS, ..., You name it.

      And then Google came and over time their new browser Chrome took over. With all consequences that might possibly have come with it ... :-( And even causing MS to retire its Internet Explorer which was a blessing a lot of people I know did not even expect any more. But in the end "we" just exchanged one "monopolist" with just another ... :-(

      And it's a REAL blessing that there are still real alternatives to anything Chromium-derived (to be honest, mostly Chrome itself) like Firefox, LibreWolf, PaleMoon, Waterfox, which mostly try to adhere to and apply real standards!

  13. Eric 9001

    Such LLM stuff seems to be proprietary software and how firefox pushes it is unacceptable - but at least they take no for an answer...for now.

    >KDE's Okular was the only Linux PDF viewer we could find that could handle them.

    Help -> About KDE

    KDE is a world-wide community of software engineers, artists, writers, translators and creators who are committed to [https://www.gnu.org/philosophy/free-sw.html|Free Software] development. KDE produces the Plasma desktop environment, hundreds of applications, and the many software libraries that support them.

  14. Sleep deprived

    Forget AI, respect my own

    Let the Android version access the about: config file and let me configure it the way I want, like disabling this most annoying tab offloading. If Mozilla is so worried about memory usage, they should stop bloating their browser.

  15. nonoj

    Primary browser Tor. If Tor doesn't work then Mullvad. If Mullvad doesn't work then don't bother with the website.

    VPN always on. If a website blocks VPN's I don't need to give them my eyeballs nor my business.

    DuckDuckGo browser with Duck Player on for any YouTube videos.

    Any suggestions welcome!

  16. David Hicklin Silver badge

    Two settings more

    The drop down from the tabs really annoys me every time the mouse passes by so these are set to false on my systems:

    browser.tabs.hoverPreview.enabled

    browser.tabs.hoverPreview.showThumbnails

    At least we CAN still set this stuff!

  17. mcswell Bronze badge

    Japanese writing

    Japanese (in any of its three scripts) is NOT normally written right-to-left, rather it is usually written left-to-right in horizontal lines, just like English. Historically, it was often written in columns, top-to-bottom, and the columns were ordered right-to-left, but that's pretty uncommon now.

    Scripts written right-to-left include the Hebrew script (used to write Hebrew) and Arabic script (used to write not only Arabic, but with the addition of extra characters, to write Urdu, western Punjabi, Pashto, and a number of other languages of that region. (Turkish used to be written in Arabic script, but that went away about a century ago.) Another right-to-left script is Thaana, used to write Maldivian. It's sort of based on the Arabic characters (including the digits), but is definitely not Arabic script per se. The Syriac script is also right-to-left.

    1. Mage Silver badge

      Re: Japanese writing

      Also Greek before about 750 BC.

  18. Ian Johnston Silver badge

    I wish Chrome would start working again properly under Linux Mint. I'm sick with Firefox for now, and it's a hideous resource hog. Example: open any subreddit, open the first five threads in new tabs. Chrome does it almost instantly; Firefox can easily take a minute or two if 100% CPU to do the same.

    If love to keep FF, but it's crap and now apparently it's AI infested crap. Remind me ... How much does the Mozilla CEO earn?

  19. Miko

    Sigh.

    Firefox, then, is one more thing that the unthinking, speculative, money burning AI promotion machine is wrecking frighteningly quickly. I have no idea what route the payola is taking, I can just see the symptoms.

  20. Mage Silver badge
    Flame

    Arrrgh!

    THEY HAVE LOST THE PLOT!

  21. Piro
    Pint

    Found these, implemented them straight away

    about:config - set all to false

    browser.ml.enable

    browser.ml.chat.enabled

    browser.ml.chat.page

    browser.ml.linkPreview.enabled

    browser.tabs.groups.smart.enabled

    browser.tabs.groups.smart.userEnabled

    extensions.ml.enabled

    sidebar.notification.badge.aichat

    I've no idea what Mozilla was thinking. The last Firefox hold-outs are on Firefox because it's supposed to have an old-school philosophy. They're not going to attract new users in a million years by adding slop features, that ship has sailed, they're all on Chrome or at least on a flavour of Chrome.

  22. Anonymous Coward
    Anonymous Coward

    Profiles gone, great

    The new profile manager is pretty crap, considering all the new profiles appear to just... disappear. What the hell

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