- Fingerprinting Protection, originally developed for use in Tor Browser, prevents Firefox from disclosing some data that uniquely identifies you. This feature needs to be manually activated. https://support.mozilla.org/en-US/kb/firefox-protection-agai...
- uBlock Origin works on Firefox on both desktop and Android. While Chrome will block an API used by uBlock Origin in 2023, Firefox will continue to support the API. (https://github.com/uBlockOrigin/uBlock-issues/issues/338) The current version of uBlock Origin does not support Safari.
Firefox has stronger extension support on Android, since Brave doesn't support any extensions on Android at all. On the desktop, Firefox's container tabs feature allows you to log into the same site with multiple accounts without needing to open a new window for each account.* Firefox's Gecko engine gives me no issues on the web.
Brave is a better choice than Chrome and Safari, in my opinion. But Firefox still has some advantages.
On Mull, you can install any compatible extension from https://addons.mozilla.org even if it's not whitelisted.* But a whitelisted extension is no less of an extension than a non-whitelisted one.