I use the Privacy Redirect extension on the desktop version of firefox, but it doesn't seem like anything comparable on the mobile version of firefox.
Mobile firefox has the ability to install all the extensions as desktop firefox but I don't think it's unlocked on the play store version (probably because not all of them work correctly) but privacy redirect should work fine. I heard Fenix on F-droid is basically regular firefox but with a lot more extensions.
Fenix on F-droid is basically regular firefox but with a lot more extensions.
Fennec (Fenix is the codename of the current Firefox release). It is Firefox minus the branding, telemetry, and a handful of proprietary components. Theoretically (and anecdotally) compatible with all desktop Firefox extensions.
On CaylxOS (a privacy-respecting Android derivative), you can select your preferred app for each type of link. I have Fritter for Twitter links and Apollo for Reddit links. I would imagine this works for normal Android too but I'm not sure. As far as how to do it, I think it prompts me whenever I click a new link type for the first time.
I just have no intention of installing an app I don't want to use for a site that friends randomly link on signal or discord.