Because its the best.

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

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).

So I started using Firefox in my early teens around 2010, I didn't know/care about online privacy etc and had no idea what open source was, I just picked it because I liked the look and theming options more than Chrome at the time.

I then kept using it because it's what I knew and I can be stubborn to change sometimes. Around 2016 was when I started looking more into online privacy and FOSS stuff it kinda just reinforced my existing use of Firefox.

Recent actions by Google with their anti-adblocking campaign and Manifestv3 have just made me dig in my heels more.