Beware testing Firefox "Smart Window": Mozilla sends a summary of earlier activity to 3rd parties
People > Companies ❤️ - programming.dev [Unofficial]
March 12, 2026
submitted by XLE to privacy
55 points | 10 comments
I was reading a review of Firefox’s experimental Smart Window feature, and this stood out as a potential huge issue:
> Smart Window uses ‘memories’, things Mozilla says “…it learns from your activity” to inform its responses.
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> You can delete memories individually, and you can set any given chat session to not use/store them.
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> Fine so far.
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> The problem? My memory list isn’t populated with things Smart Window learned since I enabled it. Oh no.
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> It has activity going back months. We’re talking searches and website interactions from long before I enabled this. features.
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> Firefox just handed that history to the AI models to plough from, without telling me upfront.
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> I found this the creepiest aspect of Smart Window.
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> Mozilla says this was a flub; it will refine the onboarding around Smart Window to limit memory formation to post-opt-in activity only. That’s obviously the right fix.
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> Because sharing a user’s prior browsing history with third-party AI models, silently, on feature activation, without any headset? Yeah, a bit icky – but that’s the price of testing features that are finished, I guess.
This news leaves me with more questions than answers:
* Was this summarized on enabling this window, or earlier?
* Did it use an existing model, or re-use one that someone may have already downloaded for a different feature?
* Is this activity going anywhere else, like Mozilla’s recent “privacy-preserving” advertising?
* When this releases, what will the default be?
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