- Supports ad-blocker extensions, specifically uBlock Origin (unlike Safari 😤)
- No Manifest V3 nonsense that will make it harder to have uBlock Origin (unlike Chrome, Edge, Arc, etc)
I'm sure other people can point to other Firefox features (better privacy, less resource-intensive than Chrome, etc.) that they think make it the best browser, but those two features I mentioned are the ones that matter to me.
Brave is also a good second choice, for the simple reason that it still supports all the adblock extensions that rely on Manifest V2.