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Announcing Faster, Lighter Firefox Downloads for Linux with .tar.xz Packaging!
(blog.nightly.mozilla.org)
From Wikipedia, the free encyclopedia
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
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.