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this post was submitted on 19 Jan 2026
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No, nothing runs as root in a Flatpak. The problem is that Flatpak stops apps from using unprivileged user namespaces, which is used by all modern browsers to isolate web contents. Because the browser (Firefox) can't use namespaces, a malicious website can use a single exploit instead of needing to chain two separate exploits, making it significantly more likely to break the sandbox.
Ah interesting. I was thinking of this post
https://lemmy.dbzer0.com/post/61124103