Because its the best.

My answer would be because it is not from Google, Microsoft or Apple and it works perfectly.

I'm aware there are some more private options, but I feel like ff is enough and is important to keep user numbers up, because once Firefox goes the forks go too.

What's great about native firefox is that you STILL can tinker arround to improve privacy/security and shape it how you want.

Don't know how long it will last though ^^" One day I'm certain I will have to switch and I will really miss my little buddy :(.

I use it because I love how the Gecko engine renders web pages. For some reason, Gecko renders fonts way better than the Chromium engine, that is literally bashing my eyes. There's something terribly wrong with the Chromium rendering... and I don't know what it is 😅

I agree whole heartedly with 4 (it's independent) and 5 (mobile ad blocking) as my main reasons, and while I haven't used 6 (picture in picture) much, I like having the option.

I also want to add Container Tabs, which is way better for me than Chrome Profiles. I sometimes have three or four email addresses logged in simultaneously (work, personal, my kid's, and my wife's), and I like having SM sites locked behind a separate container entirely (e.g. all Facebook and Instagram links go to a clean container just for Meta crap).

I use it too and there is much to like. But there is also another side of it. I'm working in Web sites and apps and regularly test sites and Web apps on many browsers and Firefox has by far the most issues. Sometimes really strange issues that we spend way too much time to fix for Firefox users and lately we just don't.