Thanks for this, dude!

Do you know of any updated guide to do something similar in GNU/Linux running without docker?

Might sound stupid given that you seem much more knowledgeable than me regarding this matter, but have you considered changing resolvers or is that out of the question? Quad9 is a very reputable company (with which I'm not affiliated in any way), and as I said before, never had an issue with them.

Have you tried raising an issue in the mozilla forums or something like that? I enabled it when it came out and I don't remember any problem that occurred because of it. Hope you can fix it!

Yes, I do, but I don't think it was because of this. It's still enabled and now I don't have any problems with the site. Do you think that it's related to DoH?

I knew about the site, but I could not access it either. I've been AFK a couple of days, and without tinkering with anything, it's all back to normal. Thank you for your help!

Thanks, everything is working well, now. I have no idea what happened but it's over.

Sorry for the late reply! Today I tried to enter the site and everything works flawlessly without any change on my end, so everything is ok now! Thanks for your help, dude!

Just occurred to me that I could try the clearnet domain on Tor, and it works well. I don't get what's up with my Firefox installation, it doesn't work in my profile nor in any new profiles.

Coud you post the .onion link, please? I have no way to enter the site to look for it.

Yeah, that's it. When I enter the old .to domain I get redirected to this one automatically, and it gives me the certificate error.