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Announcing Faster, Lighter Firefox Downloads for Linux with .tar.xz Packaging!
(blog.nightly.mozilla.org)
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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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My point is that it had an overworked maintainer who was easily persuaded into giving the project to someone else. I highly doubt it has gotten a solid team behind it now.
It wasn't "easy" at all, they had to put in over 2 years of useful contributions before there was chance to insert the malware. If you're worried just stay on an older version, it should still open new files perfectly fine.
It was easier than taking over zstd for sure
Yes, projects backed by multi-billion dollar companies do tend to be more resistant to that kind of attack.