Why don't you do a comparison to decide for yourself rather than nameless people giving you their often prejudiced opinion?

firefox is fine as browsers go. they've had some missteps recently with some unpopular decisions surrounding ads. brave has some controversies surrounding cryptocurrency and affiliate url links, as well as being chromium based. if those things bother you, and you are adverse to the ad issues, you could go with a fork of firefox, like librewolf.

I far prefer Firefox for basically every case. I honestly do a fair amount of surfing on a Raspberry Pi 4 and Chromium is unusable on it while Firefox is quite usable. And that makes me think Firefox is lighter-weight than Chromium.

I do a lot of web development and prefer Firefox over Chrome/Chromium for that purpose as well.

Brave is way too cryptocurrency-adjacent for me to be comfortable with.

I was already using Firefox well before the whole WEI thing with Chromium went down. But that made it clear Chromium isn't to be trusted.

All that said, Mozilla haa recently gotten in bed with advertising companies and talked about adding AI "features." I don't trust that Firefox will continue to be any better than Chrome.

I use Firefox for just about everything. More specifically, I use a couple privacy-oriented Firefox forks. I like Librewolf as my daily browser and Mullvad Browser as my "view-once" browser. On mobile I primarily use Mull.

Librewolf is great for me because it removes some of the Mozilla fluff that I don't use (Mozilla VPN, Pocket, etc). A lot of people would likely prefer using the arkenfox.js user configurator simply because it'll allow you to keep up to date with Firefox's native update installer.

Occasionally I'll use Brave on desktop- I find that a Chromium browser not using my strict uBlock Origin ruleset is generally more ideal for college and work-related use. Your mileage will vary considering your use case, but there's no shame in having multiple browsers that you use for different things.