You literally said:”In the open source OS world Firefox is #1 by a lot.” And that is not true. That is Linux. The fact that there are other Open Source operating systems, doesn’t really matter. Fact is. Linux is number one.
And come on. Leave the lame personal attacks to fools.
You know what. I was about to comment on my work but it’s not worth it. People who worked with me, know who I am and what I did. That to me counts. You don’t. To me you are just another random user.
Well, since you enjoy nitpicking: When you talk about Open Source Operating Systems, Linux would not even be on the list for the simple reason that it is an operating system KERNEL, but not a full operating system -- there's a reason why people talk about Linux --distributions--, because they bring all the things that are necessary to turn Linux into an actual operating system.
The #1 open source operating system on this planet is ANDROID, and Android uses a very old version of the Linux kernel. (But, yeah, you are only allowed to call it Android when you bundle a lot of proprietary Google services, otherwise you must give it a different name like LineageOS, for example...)
Debian is a very popular Open Source Operating System - widely used in the scientific sector, for example on High Performance Compute clusters and also used as the foundation of many even more popular operating systems like Ubuntu, for example - but guess what: There are flavors of Debian that don't use the Linux kernel at all; you can have the same operating system with the FreeBSD kernel or even the GNU/Hurd kernel. It's still Debian, but with a completely different kernel.
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All the so-called "Linux" distributions are really distributions of GNU/Linux.
Unless you take the BSD user land around the Linux kernel; not that anyone ever actually did this in a meaningful way, but it has been discussed in the past.
Also, Android is very much devoid of the GNU user land -- and Android definitely is a Linux distribution.
So, no -- even though Richard Stallman never got tired of shouting "it must be called GNU/Linux", there is at least the possibility of a Linux WITHOUT GNU.
For historical reasons: Steve Jobs back in the day discussed directly with Linus Torvalds the possibility of using the Linux kernel in a version of the Macintosh operating system. As we all know, this eventually became the FreeBSD based Mac OS X, nowadays simply known as macOS. (Before the further nitpicking begins: NeXTstep was built upon the original Berkely System Distribution, BSD, out of which FreeBSD was derived. Technically, macOS uses a "Darwin" foundation, but guess who the father of Darwin was...)