Privacy primarily and less likely to be targeted for widespread attack because there's a fraction of the user base Chrome enjoys.

It's by far the best mobile browser that let's you run tampermonkey and uBlock on Android and it's not close. I haven't found an add-on that let's me run video/audio in the background, so until then Brave stays installed so that running YouTube with no ads and the phone locked is an option.

Aside from that, Firefox gives fantastic customization options, runs well, and is less vulnerable to attacks specifically because it has a smaller market share and it makes more sense to target Chromium based browsers.

Because Lemmy told me to

Because Chrome stuffed up my task bar icons one time too many. (eg two Gmail icons, once for each account - randomly start working as bookmarks instead of their own window.) Fixing that takes many attempts

Firefox can't do this at all, but an extension fixed that.

Idk really. At work I prefer chrome behaviour more. Also the spellcheck is better.
At home I prefer firefox more. Probably more because I like the addon feature like Dark reader and ublock on Firefox mobile.

Because it's good

For the price of mild inconvenience in some cases I get to add a tiny little bit of resistance against chromium monopolistic rule.

Its not Google

Writing Firefox extensions sucked.

I haven't tried web extensions.

Because they stopped making new releases of Phoenix

What‘s the alternative if you try to avoid google?