This is an excellent use case for completely local, small model inference, yet for inexplicable reasons Mozilla wants to normalize uploading your entire private browsing history to a cloud.

These (Mistral's and Mozilla's) marketing pages aren't candid enough to clearly explain the difference between local and cloud inference, and that they're asking you to consent to enabling the latter. I'd call that the bare minimum of ethics. If you're in a position of authority over your less technical users, you are ethically obligated to give them the full picture of what are you doing and why they should consent.

(Aside to any Mozilla people who might be reading HN, your page here[0] has an oversight, it advertises this model as "Mistral Small 4" but the hyperlink is to OpenAI's model card for gpt-oss-120b).

[0] https://support.mozilla.org/en-US/kb/smart-window-models

Would be very cool if you could type a long query and the model would just build an advanced google search query using what you typed. You could even ship a tiny model in the browser itself that does that.

Something like: "blog posts which talk about using sending emails to yourself as a notes taking mechanism".

The output could look like: "note taking" OR "notes" ("emailing yourself" OR "email to myself" OR "email yourself") (inurl:blog OR inurl:posts OR site:medium.com OR site:substack.com)

It's interesting to see Firefox attempt to create slightly more privacy-focused cloud inference infra (assuming you can trust that they adhere to their own policies and don't have bugs, and that their partners adhere to their contractual obligations and don't have bugs). Unfortunately that's still a lot of trust that's pretty much impossible for the end-user to verify, but at least it's something? Arguably it's better than the alternative of directly trusting AI companies that have shown absolutely no regard for other laws like copyright, but the marketing of this as ultra-private still leaves a bad taste. I wish this announcement clarified the cloud aspects directly instead of needing to browse through two layers of links to find how it actually works on a privacy notice.

Seems like what Chrome has with the default built-in Gemini Nano model.

Hey at least "some" news/things from Mistral. Seems like ages ago when they launched vibe-code.

> Powers context-aware search, page summaries, and memory retrieval across browser tabs.

> Live in France and North America, with launches in the UK and Germany planned for later this year.

> Built on a zero data retention policy; conversations are not saved on Mozilla’s servers by default.

> Models are fine-tuned on regional languages, dialects, and local nuances to provide native-feeling responses.

> Extends Mistral’s open-weight AI models directly to consumer web browsing alongside its enterprise offerings.

It’s not obvious but you can use this with your own local (or any) models.

https://support.mozilla.org/en-US/kb/smart-window-byom

This sounds great, will have to try it out. Interested in the business value they gain from this, as this appears to be free.

I guess for mistral it's great marketing material.

Edit: Quite interested in the differences of local optimizations... that does allow for specific sensorship, but alas that's already possible in a more direct, reliable way.

These are two companies that seem to be slipping in ethics recently. I'd prefer this over a chrome and openai offering, but I no longer trust these two to necessarily do the right thing regarding privacy

They misspelled their own company name:

"...working together to bring Mistal’s scientific innovations to consumers around the world"

A quick proof-read wouldn't have gone amiss here.

I also fail to see how privacy is enhanced by sending private browsing data to a cloud service which then forwards it to an LLM, in addition to storing 'memories' and dredging through my browser history.

"Private"

Guess we just using buzzwords for marketing and have no morality or principles anymore. Bad timeline and people you should just not trust.

Glad to use ~~Unmozilled Firefox~~ Librewolf

Mozilla lost the tech race and with it a lot of users. Firing a lot of their talented developers didn't help. Now Mozilla is giving up the only reason why they kept a core audience of privacy focused users by sending our browsing data to third party servers for inference just at the time when small local models are getting good enough for many/most use cases like summarization or translation. Chrome provides an API for local LLMs. Apple is trying to run as much interference locally as possible. Mozilla is worse than that. Claiming private browsing while sending data to third parties.

I don't care what their data retention policies are, I don't want my data to be sent to others full stop.

Private means it's mine, it's under my control. Handing it to third parties is not private.

What is "AI browsing"?

I’m fine with cloud features, but I’d like to know what stays on my device and what gets sent out. “Private” is a bit vague.

Didn’t OpenAI tried to build even a new AI browser and failed? I honestly don’t need AI in my browser and would not let an agent to access my login credentials/cookies/saved payment methods for various sites.

Not sure if it's a locally run model or in the cloud. If it's the former they don't explain the size on disk and more importantly on memory. I know that google is using local models on the pixel phones, so it's doable. If it's the later, the "Mozilla don't keep the data" is hypocritical and I'm perplexed by the cost associated.

In any case as a french, I prefer my personnal data be exploited by a french company :D

Edit: after reading the comments, it is not a local AI so "Mozilla don't keeep the data and don't train on them" is really hypocritical if they cannot confirm that it's the same on mistral side. And there is still the question of the cost.

I really do not get the obsession with translation, particularly bad translations and translating by default. Most people who browse websites in languages other than the official local one are fluent in that other language.

Google Chrome keeps insisting that Spanish is Galician. PowerPoint insists on changing the spell checker back to the wrong language and ignores setting the language for the whole presentation. On Linux, ChatGPT insists it must enable the spell checker in the local system language, so everything is always red.

Privacy aside, a lot of software seems to be built assuming people cannot be multilingual.

Related, but hardly activity:

"Firefox Smart Window" 21.apr.2026 https://news.ycombinator.com/item?id=47852016

"Firefox Smart Window" 18.aug.2026 https://news.ycombinator.com/item?id=49345179

"Firefox and Exa Partnership" 18.aug.2026 https://news.ycombinator.com/item?id=49346066

this is chatgpt, web gui from mistral built-in Firefox, not for tech savvy users. I think anyone that will complain about this knows very well that you can just give your harness control over firefox through puppeteer, which is much more powerful. could firefox itself become a harness and speak openai api responses? maybe yeah, but why?

Firefox/Mozilla really lost the plot.

Remember when it was the fastest thing around and simple?

Now it's an also ran. AI doesn't help here. Focus on what made it great in the beginning, make it the most performant browser around. Put Fable on the case if need be. Do the browser thing well!

I cannot in a million years imagine using these features. Just be more organised.

Pretty keen on the private, multilingual aspect here. Could be a real game-changer for digging through non-English dev docs.

"Mozilla" and "private" are two phrases that don't go well together, these days.

Hold the AI, just give me a zen/Vivaldi like autohiding vertical tab stack and we're good.

No amount of pixel art will convince me to give up on the freedom to choose.

Neat, how can I turn it off?

Cloud inferrance is not private: These providers, even if they don't get hacked, have bribed employees, or outright lie, cannot and will not resist a subpoena or similar.

Mozilla is acting unethically by obfuscating what's on offer here and overstating the privacy and security properties that can be achieved.

It's doubly unfortunate because simple translations are completely reasonable to do with cpu inference.

Another element of these "claimed to be private but can't keep its promises" is how caustic it is to the trust we have for our friends, family, and business associates.

People here can be privacy aware and well informed and avoid these data slurps-- perhaps go dig up the hidden settings to completely disable it or add firewalls so an errant keypress won't upload your browsing history. That's good.

But anything I share with another person or put on some webpage for another-- perhaps highly trusted person like a doctor or lawyer-- is exposed to them uploading it perhaps completely unwittingly (e.g. they fell for the exaggerated privacy claims) or due to an innocent misclick.

Normalizing privacy fails like this undermines the ability of even the most informed and aware people to opt-out.

So now mistral has partnership with browser + user logs from Mozilla. Does it means that they are trying to build their own search index? Because it’s kinda huge inference investment in exchange for what? Any other ideas why they need this?

Nobody asked. Give me back my RAM.

What the fuck is the point of this?

What is Mistral bringing to the table for Firefox? There is nothing "open" about this in any way.

FF needs to either profile itself as the no-ai-by-default browser, or it needs to just have OpenAI/Anthropic/Mistral/DeepSeek bid for the default spot - like they do with Google search.

I'm happy Mistral exists. I'm happy Firefox exists.

None of this shows any synergy i'm excited about.

Maybe FF believes there is a group of users who are still on the fence about using FF - until they can pitch them a first-class build-in AI story that goes with the anti-establishment vibe?

I somehow doubt that's the pitch & potential userbase they should be focussing on.

I certainly hope one of Ironfox or Librewolf will strip this shit out by default.

>>Mistral has been releasing open weight, frontier models since our first release.

yeah ?

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Please don't.

This will put duo lingus out of business.