

I don’t think there’s one that supports all of them yet. Probably the one that can handle the most is fedilab, which can handle mastodon and friendica, as well as a bunch of others like pixelfed, peertube, and pleroma. There’s also raccoon, which has separate apps for lemmy and friendica.
They’re not browsers, but if you want lemmy in the terminal there’s Neon Modem Overdrive, which also handles Discourse forums and some other sites. For emacs there’s lem.el.