this post was submitted on 11 Jun 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Browsers do have their own sandboxing, trying to prevent things like a JavaScript overflow on one website affecting other tabs, etc
Flatpaks use user namespaces and run each program in their own filesystem snapshot
Chromium in flathub has been patched to support its own sandboxing inside of the Flatpak sandbox
Firefox only loses its user namespace, but Flatpak has already put it in its own user namespace
The only reduction in the browsers own sandboxing is if they’re creating separate user namespaces per remote process, but in about:support, Firefox still lists itself as having the max sandbox level even in the Flatpak
The nice thing about Flatpak is that you can restrict it even more - e.g. my browser is only allowed to touch files in ~/Downloads/firefox
I don’t use webcams/mics through Firefox, so it also has no access to those, etc
You can set fine grained permissions easily with a program called Flatseal to decide what your browser should be able to touch on your machine