You can try playing with Arkenfox, installing uBlock Origin, fiddling with about:config, and giving yourself an aneurysm…

…or you could try Mullvad Browser. It’s a fork of Firefox, co-developed by Mullvad and The Tor Project, with impressive fingerprinting resistance (according to Cover Your Tracks). It’s like Tor Browser without Tor.

Also, install NoScript. It helps a lot.

Looks like it is. I had noticed a few Mastodon and Misskey instances blocking poa.st, but I didn’t realise it was the same as poast.org.

Good thing there are other instances now!

Guess it’s time to either get a new pendrive, or enter the void.