Mozilla Thunderbolt

(thunderbolt.io)

119 points | by dabinat 3 hours ago ago

96 comments

  • drzaiusx11 21 minutes ago

    For anyone reading this that has worked on the launch of this new product (or the many others of their ilk throughout the years) under the various Mozilla orgs, I mean no disrespect, however I feel it's important to not mince words these days..

    I implore ANYONE at Mozilla org to please, please stop working on projects distracting from the complex and necessary work of browser and web standards stewardship. That alone should be the very reason for your continued existence if you have any. Focus on anything outside that purview will lead to the furthering of the, already painful and readily apparent, stagnation of your browser and our standards bodies as entities distinct from corporations.

    Ditching any direct financial ties to Google or any other browser vendor is both important and necessary at this point, as this clearly represents a conflict of interest in your overall mission.

    The web as a platform should belong to us all, not just the few corporate leaders of the day. I've watched in real time, saddened by the persistent errosion of our commons that is the web. I see it becoming nothing more than a corporate playground should trends continue, if it's not already too late. There may have been a time when your mission took precident over product launches of seemingly unrelated domains, but that is not what Ii observing today.

    I think I speak for many in the community in these regards (please correct me if not the case.)

    • ryukoposting 2 minutes ago

      > already painful and readily apparent, stagnation of your browser

      What's wrong with Firefox? There are several things Firefox does that it's annoying to live without in other browsers (video pop-outs, competent ad blocking, etc). Is there some core feature that's missing? I'm subjected to Edge at work and I couldn't tell you a single thing it does that I'd want FF to do.

      > and our standards bodies as entities distinct from corporations

      Ok, I buy that.

    • CivBase 12 minutes ago

      I'm perfectly fine with Mozilla working on other things as long as those things are profitable or at least self-funded. As long as they are not leeching donated resources from Firefox or Thunderbird, I don't see a problem. However, I wish I had some kind of assurance that the money I donate to Mozilla would go to Firefox and not some other project like this.

    • ojubknobugh 13 minutes ago

      I agree with the sentiment, but it’s hard to agree fully with anyone seeming desperate.

      This reads like a kid trying to give business advice to an adult. “You could do THIS, then THIS, it would also be cool if you did THAT but please don’t do THAT!!”

      C’mon now.

      • drzaiusx11 9 minutes ago

        Mozilla should not be a business, full stop.

        The fact that is being run like one, albeit poorly is exactly the problem.

        I don't think you realize the irony in calling my post childish here. "C'mon" I guess?

  • anildash an hour ago

    Addressing the usual few complaints folks always bring up:

    * This is from the separate independent team that works on Thunderbird, not Firefox, so there isn't any resource contention happening there

    * Thunderbird is revenue positive, and this potentially gives that team another revenue stream to be even more self-sustaining through charging companies

    * Businesses definitely want to control the AI they're using (especially with RAGs of their own data) instead of just throwing it at their LLM vendor and hoping for the best

    People on HN are fond of asserting that their own POV is the only one. Imagine that there is such a thing as a person in charge of choosing technologies for organizations, and that you're such a person. That's who this is for.

    • CamouflagedKiwi 19 minutes ago

      > Businesses definitely want to control the AI they're using (especially with RAGs of their own data) instead of just throwing it at their LLM vendor and hoping for the best

      Yes, agreed on that. I'm not sure I'm clear how this really helps that; I suppose it's a frontend that they don't have, but there are a bunch of those already.

      It doesn't seem to help them control the _actual_ AI, i.e. the model, which still has to come from somewhere.

    • afandian 23 minutes ago

      It goes to show that Mozilla(s) could, if they really wanted, restructure Mozilla Corporation / Foundation.

      (edit - to allow users to fund Firefox, allowing us to better sleep at night, and to align our incentives)

    • drzaiusx11 16 minutes ago

      I see no reason this product should exist even under the Thunderbird umbrella, especially if ANY resources under ANY Mozilla org were employed in this. This product is a distraction from their core mission in either case.

    • tux3 an hour ago

      >Thunderbird is revenue positive

      Hmm, I thought the for-profit Thunderbird pro hadn't launched yet?

      I know Thunderbird is for profit, but what are they profitting from without the paid service, and how much of that profit is going into this unrelated Thunderbolt AI platform, exactly?

      • abdullahkhalids an hour ago

        Thunderbird currently runs entirely on donations, even though they have paid products in the pipeline.

        I think a piece of software running on donations is not running off "charity". It's just a business model to not charge every user. Similar to how Twitch streamers operate, or my local theater group.

        You can read how they spent money in 2024 [1].

        [1] https://blog.thunderbird.net/2025/10/state-of-the-bird-2024-...

        • ryanleesipes 16 minutes ago

          No, this was built with money from an grant from Mozilla.

        • tux3 40 minutes ago

          Thanks, that's helpful. This says about ~70% of the money was paid to employees, ~10% infra costs, the other ~20% various other fees and smaller expenses.

          It would be interesting to have a breakdown of what part of the Thunderbird team is working on Thunderbird, Thunderbolt, or other forms of thunder.

        • badgersnake 19 minutes ago

          Wait what, they took donations to pay a team to build a mail client and had them build an AI thing instead? Or have I got that wrong.

          • ryanleesipes 16 minutes ago

            No, this was built with money from an grant from Mozilla.

    • LandoCalrissian an hour ago

      Thunderbird was literally asking for donations just a few days ago?

      • ryanleesipes 15 minutes ago

        This was built with money from an grant from Mozilla. See the bottom of this page: https://www.thunderbolt.io/announcing-thunderbolt

      • Wolfrich an hour ago

        it is a patreon style thing, they are donation funded. I think the poster is saying that they arent being frivolous with their money like some people have a bad taste about firefox

      • eipi10_hn 38 minutes ago

        And?

        • bakugo 19 minutes ago

          And they're taking money donated towards Thunderbird development and spending it on random unrelated AI slop ideas that nobody asked for. You really don't see anything wrong with that?

          Surely you can agree that when you open Thunderbird and are met with requests for donations, if you chose to donate, you'd expect that money to be invested in Thunderbird development, and not 10M Claude tokens to vibe code Mozilla's latest groundbreaking AI B2B SaaS idea?

    • monooso 23 minutes ago

      Just for clarity, you do mean Thunderbird (the email client), not Thunderbolt (this new AI client)?

    • bakugo an hour ago

      > Thunderbird is revenue positive

      Is that why I'm met with a splash screen asking me to donate every time I start Thunderbird? Is this another Wikipedia situation?

      • rothific 6 minutes ago

        I think that wasn't phrased well- it's "revenue" positive meaning donation money covers more than the expenses

      • godelski 10 minutes ago

        You think that just because the software can be downloaded for free means the developers shouldn't get paid for their work?

  • spudlyo 2 hours ago

    Chrome on Linux is ~1.47 times faster than Firefox on the Jetstream 3 benchmark as recently reported by Phoronix[0]. That's how we want you to spend the money Mozilla, keeping up with your well-funded rival Google, and making it so we don't end up with a browser monoculture. These sorts of distractions just piss me off, and are not part of your core mission.

    [0]: https://www.phoronix.com/review/firefox-chrome-2026

    • eipi10_hn 21 minutes ago

      Why is this related to Firefox?

    • p-e-w 43 minutes ago

      Firefox has many weaknesses, but I never once thought “man, that thing is slow”. It isn’t, and chasing benchmark numbers is a waste of effort. A better security model or deeper customizability would be far more valuable.

      • Zardoz84 29 minutes ago

        The fact it's that for a normal usage, Firefox with uBlock Origin it's faster that Chrome without ad blocking. On Android this is especially noticeable.

    • ramon156 an hour ago

      Ladybird soon™

      • panzi an hour ago

        Not nearly soon enough. But yes, there is hope. Far away hope, but still.

    • clumsysmurf 44 minutes ago

      And regarding (memory) performance, chromium has the "memory saver" settings for unloading tabs. I don't understand why mozilla thinks its acceptable to require users unload tabs manually. Who even does that?

      • Erenay09 34 minutes ago

        I use the about:memory tab whenever I need to clear some memory. However, it can't unload tabs.

    • whalesalad 27 minutes ago

      mozilla will do literally anything but make firefox better

  • crazygringo 23 minutes ago

    Wow this is a confusing name.

    At a glance it looks identical to Mozilla Thunderbird, but has nothing in common.

    And then of course it's also the same as a well-known hardware interface.

    I know it's hard to come up with names and pretty much everything is used by something else, but this seems particularly bad.

  • einr an hour ago

    120k LoC of probably largely vibecoded nonsense for a window with a text box and a button that lets you send and receive some data over a HTTP API.

    Their Thunderbird for iOS repo is 34k lines.

    I'm so very tired.

    • dralley an hour ago

      >120k LoC of probably largely vibecoded nonsense for a window with a text box and a button that lets you send and receive some data over a HTTP API.

      "I will make loads of assumptions without checking so that I can invent reasons to get mad"

      Note that about 30,000 of those lines are JSON files for localization and testing, as one example.

      • mzajc 33 minutes ago

        22,056 is not about 30,000. Per scc:

          Language      Files     Lines   Blanks  Comments     Code
          ─────────────────────────────────────────────────────────
          TypeScript      760    109110    14500      7397    87213
          JSON             41     22056        6         0    22050
          Markdown         56      7150     2086         0     5064
          YAML             33      3965      406       208     3351
          ... and many more with fewer than 1k lines
        
        Regarding "loads of assumptions," it's hard to tell how much of this is vibecoded slop (definitely non-zero looking at the commit log), but I don't think it's that outrageous to claim 87k sloc is too much for a textbox and an API wrapper.
      • einr an hour ago

        How much UI text does this thing have that it needs thousands of lines of localization? Where are these files?

        Especially curious because I see a whole lot of hardcoded english text in there…

      • stonogo an hour ago

        Are you arguing that 90k LoC for a window with a text box and an overengineered textarea tag is somehow more acceptable than 120k?

    • rothific 3 minutes ago

      Hi, I'm on team that worked on this. No it's not vibe coded. We do pretty intense code review of every PR. It looks like the number you're seeing is including lock files and artifacts that are not part of the core coverage.

    • ChrisRR 43 minutes ago

      Maybe you wouldn't be so tired if you didn't make assumptions of things to be mad about

    • maelito an hour ago

      Wait what ? Did you include libraries imported by NPM in this count ?

      • einr an hour ago

        I don’t think so. I just used a public GitHub LoC counting tool directly on the repo, there are a few.

        https://ghloc.vercel.app/thunderbird/thunderbolt?branch=main claims 141k and most of it is Typescript.

      • Tade0 an hour ago

        I imagine that would bump that number to milions.

        I just checked one old take home task in Angular I did last year and the total number of lines is over five million over 35k+ files.

  • CamouflagedKiwi 30 minutes ago

    What even is this? A chat frontend to arbitrary model providers on the backend - I guess that's sort of useful not to have to build yourself but it doesn't feel like the amazing thing they're trying to hype. Some of the features seem a bit weird to me too - like end-to-end encryption? There isn't a server intermediary, so you already have that with TLS to the model provider.

  • wolvoleo 2 hours ago

    Curious name choice, that's clearly encumbered by other trademarks.

    Also, my impression is: yay another AI front-end. What does this one differently that the other thirteen in a dozen don't?

    • benoau 2 hours ago

      > What does this one differently that the other thirteen in a dozen don't?

      Mozilla's a lot more trustworthy with privacy and data, and they're unlikely to sell the project to someone who only wants to stuff it full of malware/adware/crypto stuff - or do it themselves.

      • BowBun an hour ago

        I'm somewhat a fan of Mozilla, but their weak governance with regards to actual plans for the future, a couple of questionable partnerships, and the graveyard of products makes it hard to trust based on a 15+ year-old reputation. Would love to see where Mozilla has meaningfully contributed to the modern tech space (things we all actually use, not Mozilla versions of more popular apps/tools)

        • bryanlarsen an hour ago

          But despite that, Mozilla is still far more trustworthy than virtually everybody else. Who would you trust more? I imagine it's a very short list. Which is a sad state of affairs.

      • imiric an hour ago

        This Mozilla?[1] The company whose 85% of revenue depends on an adtech giant?

        They're certainly doing better than others in this space, but their track record does not inspire confidence for anyone concerned about their privacy and data.

        [1]: https://en.wikipedia.org/wiki/Mozilla#Controversies

        • Wolfrich an hour ago

          that is the firefox groupn not thunderbird. Diff bro

    • rob74 an hour ago

      ...and also differs in just three characters from another Mozilla product.

      "I'm using Mozilla Thunderbolt."

      "Huh, do you mean Thunderbird?"

      "No, Thunderbolt!"

  • ezekg 14 minutes ago

    I swear there are like 10 different Thunderbolts. Why reuse such a common name?

  • soapdog 2 hours ago

    oh mozilla, why don't you just focus on Firefox. That is all we want.

    • dralley an hour ago

      People "want" a lot of contradictory things. People "want" them to be less financially reliant on Google, while also "focusing" on a browser in a market that is entirely commoditized and subsidized by 3 of the 10 largest companies in the world - and having a wholly implementation independent browser engine when it's so massively difficult and capital intensive that even Microsoft gave up on it.

      • eesmith an hour ago

        I want them to actively seek foreign sovereign tech funding which come with stipulations that commit Mozilla to certain levels of privacy and anonymity.

        I want them to go cap-in-hand to other countries and say "if you don't fund us then you are letting the US and surveillance capitalism get between your citizens and their government" and "do you really know what Chrome is doing with your data?"

        I don't want to pretend they are simply part of a browser marketplace, but rather have them realize they are part of a civil rights effort, with powerful non-market forces they can allay with.

        And I want those governments to commit to progressive enhancement guidelines like https://www.gov.uk/service-manual/technology/using-progressi... so new alternatives like Ladybird can start, and further require their agencies to test on a Firefox branch with no AI, no location tracking, full ad-blocking, etc. because while the market is free to ignore certain non-profitable users, a government should not be allowed to ignore some of its citizens.

        I don't see a contradiction there.

    • roryirvine 2 hours ago

      This is from MZLA Technologies, so is a sister product to Thunderbird rather than Firefox.

      • SV_BubbleTime an hour ago

        OK, but does Thunderbird have flawless exchange support yet? Can I replace Outlook with Thunderbird for our 365 accounts? Does Thunderbird have UI that is welcoming and modern?

        Does a dollar go from Marla to MZLA? Are those dollars not fungible?

    • data-ottawa 2 hours ago

      I agree with you, there are 1,000 different chat apps and just one Firefox. And the world needs Firefox more than it knows.

      It looks like they might want to get into hosting/selling services to users on this.

      From the FAQ:

      > Is there going to be a hosted version if I don't want to deploy it myself? > Yes, we are planning to launch Thunderbolt for regular users but we do not have a release date yet.

      • dralley an hour ago

        There is "only one Firefox" but Firefox exists in a market that is not just commoditized, but subsidized to the tune of billions by 3 of the 10 largest companies in the world.

        The world may need Firefox but it's funny how people complain about Mozilla's dependence on Google while also complaining about every attempt to become more financially independent from Google.

        • techjamie 15 minutes ago

          They could start getting some of that goodwill back by not paying their CEO a multi-million dollar salary and opening donations to actually help fund Firefox.

    • stormed an hour ago

      The anti-trust lawsuits with Google have Mozilla realizing they can't just be a company kept afloat by Google. Mozilla's priorities have been pretty complacent, basically just maintaining Firefox, sometimes Thunderbird, and a couple side services that have little financial incentives.

      The current state of Mozilla is pretty odd since they rebranded to make it more apparent they're a non-profit, while also attempting to become more profitable pushing out new products and services.

    • eipi10_hn 19 minutes ago

      Why is this related to Firefox?

      • rothific a few seconds ago

        It's not. Mozilla has been more than Firefox for a long time.

    • gianthard 2 hours ago

      RIP Firefox OS

    • SV_BubbleTime 2 hours ago

      If this is correct and Firefox is now 2.3% opposed to Samsung Browser and Opera both at 2%… it’s pretty much over.

      https://gs.statcounter.com/browser-market-share#monthly-2009...

      As a former Netscape user… I think it’s almost masochistic to remain on Firefox as it’s rewarding a company that mismanaged its only product into the ground. And for what? What is the amazing thing Mozilla did at the expense of Firefox and donating the direction of internet technologies to Google?

      The executives got to attend a bunch of fancy gallows, and Pat themselves on the back?

      • lurkshark an hour ago

        By that logic wouldn’t it be pretty much over for Mac OS as well?

        https://gs.statcounter.com/os-market-share

      • Kye an hour ago

        Firefox started at 0% when IE was more dominant than Chrome is today. Nothing is certain.

        • SV_BubbleTime 27 minutes ago

          Firefox hit a peak of 32% and has fallen ever since. Effectively Firefox crashed at the same time IE did, and I can’t see in what way Mozilla ever attempted to recover.

          • Kye 13 minutes ago

            You: "...it’s pretty much over"

            Me: "Nothing is certain."

            That's all

      • Wolfrich an hour ago

        What the heck are you talking about? This is from the Thunderbird group not the firefox group...

  • stormed 2 hours ago

    I thought Mozilla was going to join the Thunderbolt standard and/or making some tool for it until I clicked the link haha. Very interesting name choice

    • SV_BubbleTime an hour ago

      This is a fair point. There is absolutely no way they didn’t know what Thunderbolt is, so they did this on purpose. Just rack it up to the list of obviously bad decisions that brought us here.

      • busywaiting 43 minutes ago

        I also love that it's a .io domain. Just to maximize the chance that you'll confuse Thunderbolt dot io with Thunderbolt the I/O standard.

  • butz an hour ago

    Good thing they didn't name this Unity or Proton. We are seriously running out of names for applications and services, ar we?

  • Wolfrich an hour ago

    Some confusion I see here is lots of people seem to not know that MZLA who makes Thunderbird and Mozilla Corporation who make firefox are separate entities in the Mozilla Foundation umbrella. This Thunderbolt is a MZLA product... so ya

  • thecrumb 2 hours ago

    "Mozilla Bubble" Building things no one wants.

    • evolve2k an hour ago

      Some of us are out here still waiting for Firefox relay “premium” to launch and provide disposable mobile numbers like they do email addresses.. but product has for some reason been stuck on “join waiting list” for what feels like an absolute age.

    • SV_BubbleTime an hour ago

      Pocket, lol. I think the Mozilla VPN could have been OK but it was just rebranded Mulvad and they didn’t make it easy and obvious to use.

      Is there a FF fork doing anything good out there?

      • pndy an hour ago

        Watefox, Librewolf have both plucked out all unnecessary stuff Mozilla added over the years. Both are good but Librewolf comes with history and cache disabled by default which may be bit surprising.

        Floorp comes with additional custom interface features, workspaces (tabs grouping) and mouse gestures. And bit better profiles feature - Mozilla decided to redo it recently which lead to some problems.

        Mullvad has build in VPN, DoH and proxy as an extension, and comes with uBo and NoScript.

        There's Zen browser that has a quite uncommon UI, and obscure Pale Moon that IIRC still tries to provide old XUL/XPCOM extensions - which often leads to pages rendering issues.

        • mzajc 24 minutes ago

          A tip for Librewolf: you can easily toggle permanent cookie storage for a site through the "Always store cookies/data for this site" option in the shield button menu on the URL bar. This is very convenient compared to vanilla Firefox where you have to add exceptions through the settings.

  • who_is_mr_tux an hour ago

    I'm gonna deploy it on my machine and try it! Better option than using ChatGPT or Claude.

  • zuInnp 2 hours ago

    If this wouldn't be under Mozilla/Thunderbird Org on Github, I would have considered this to be fake. It looks very unsubstantial ...

  • beeflet 40 minutes ago

    It's weird that they would name it like thunderbird

  • ForHackernews an hour ago

    There's an architecture diagram here: https://github.com/thunderbird/thunderbolt/blob/main/docs/ar...

    It seems like all the model inference is external APIs? So why is the marketing claiming "Self-host on your infrastructure or let us help you deploy. Your data never leaves your control."

  • poolnoodle an hour ago

    Thank god for the Ladybird project

  • bartvk an hour ago

    Lots of negative posts here, who presume to speak for others. I, for one, welcome new entrants especially since they're under the Mozilla umbrella. This client could use the passwords and cookies stored in Firefox. And I'd trust it too, unlike other clients.

  • hexo 40 minutes ago

    No way they really named it thunderbolt. I mean. Seriously? What is next Mozilla USB-C vibeslop?

  • shevy-java 2 hours ago

    Yikes.

    Could Mozilla hand over firefox to a new team please? It is clear they are wasting time and energy on things nobody wanted - who wants Mozilla-AI please? I mean, seriously?

    For people who don't think Mozilla wants to make firefox competitive again; and for those who also don't think ladybird will become a viable alternative one day (that's for the future, I have no crystal ball, I am just pointing at one possibility here). Perhaps we could get more momentum when someone else other than Mozilla handles firefox.

    • eipi10_hn 18 minutes ago

      Why is this related to Firefox?

  • Pxtl an hour ago

    Aw, another AI thing. I was hoping this was their email service.

  • pixel_popping an hour ago

    If I may, Mozilla, you shouldn't release half-ass products that looks vibe coded like this, even the website looks like it took 30min to do with Claude