Using an alternative DNS resolver like 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) could solve that already, and not only in Firefox.

That will not work. Some ISP do DNS transparent proxy (forward all udp packet 53 to their own DNS server). You need DNSCrypt or VPN.

It depends how the block is implemented. If it's done by intercepting DNS requests, it doesn't matter what server you _try_ to reach. There's also the Virgin (UK) approach of allowing the correct DNS response, but tampering with HTTP requests (though switching to DNS-over-HTTPS wouldn't help in that case).

Or Quad9, but this could be intercepted.

apt-get install unbound

I was already using 1.1.1.1, did not unblock. Would be very curious if the ISPs were actually proxying my DNS requests. Any tips on how I might test that on Ubuntu?

They generally inspect DNS packets and block hostnames from resolving correctly. Does not matter the destination.

Be aware that using it in 60 you may run into frequent crashes from https://bugzilla.mozilla.org/show_bug.cgi?id=1441131

Thanks for the heads up, ill keep that in mind if i start seeing issues. So far so good.

Ok that is news to me, why Indonesia blocks it?

porn, hate speech, and pirate related stuff is blocked by government

Well, shame on you. All the armchair experts at hacker news say that the implementation is really bad and you should feel really bad for using it. So please stop using it and make them happy.

Reddit, Vimeo? What is their justification for blocking those?