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The Mozilla layoffs ... will get worse
(lemmy.world)
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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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I've seen two cases that actually directly impacted my ability to use Firefox. I can only presume there are many more. Those being supporting the column-span CSS property (available since 2010 in other browsers with vendor prefix, and early 2016 without, while being late 2019 for FF) and supporting iPad OS's multi-window functionality (introduced mid 2019, Firefox has had it for just a handful of months now). I have first hand experience telling me very directly that this is true.
There's also been a lot of talk about Firefox's lack of support for PWAs. I've not experienced that myself to be able to comment more than to say I've noted others have complaints.