That's unfortunate, but you don't have to use Firefox. I don't understand why some people think more options are bad. You can still use Safari or Chrome.
Chrome is spyware under a different name and they won the desktop market by sabotaging Firefox and taking advantage of their search monopoly by blatantly advertising their browser. Most developers focus on the technical features and miss what giving such a bad actor a chance to monopolize another device category means.
Firefox is barely alive because of mismanagement and Google’s dirty tactics. If one could give access to Firefox while blocking Chrome that would be ideal.
That may seem wrong only because you’re thinking about things very literally. In reality it would blocking a known monopolist with a track record of bad behavior from monopolizing another market and allowing everyone else including Firefox to take part.
Firefox won from IE. it successfully broke the IE monopoly and gained significant market share. Then, years later, chrome entered the stage and conquered both.
I don't know in which world you live, but in the world I live common people (that is, non computer nerds) all had Windows and all used Internet Explorer. A few had Firefox or Opera or MacOS, but they were a little minority.
Yes, Firefox usage peaked at about 20%: surely not negligible (didn't know anybody myself using it !). As for geographical distribution, I could only find this: https://gs.statcounter.com/browser-market-share#monthly-2009...
The data goes back up to 2009, which was quite a peak period for FF...
Sure FF has played an important role in the browsers war, but it hardly broke the monopoly, or at least it did not do it alone (Safari and Opera started to gain a significative share at the same time).