Seconding the idea that it sounds likely to be a DNS thing. Android Firefox is apparently capable of DNS over HTTP, but it's not immediately clear to me how to turn it off to see if that's the problem, unless you have access to about:config.
Top. Thinking about it, I feel a vague sense of dread anticipating the day Mozilla decides it should be the same for everyone and removes the option, as is their wont.
Who cares what big-time tech execs think about it? There ought to be protests in the streets about this. They're trying to outlaw end-to-end encryption. They're not even really trying to hide that any more. If they succeed, the UK won't be the first country to do so. Signal isn't threatening to leave because they're worried about the potential ethical implications of the new rules. They'll be leaving because their product will simply be outlawed. The UK will be joining the ranks of other notable countries who've gone that way, such as Iran, China, Cuba, Egypt, and Oman.
Canada has not yet introduced its version of an "Online Safety" bill, but it will be coming soon. Right now would be a very good time to write to your MP asking them to do what they can to stop it from including any of this kind of stupidity.
https://www.gamesradar.com/fans-have-been-remaking-oblivion-in-skyrims-engine-for-11-years-so-of-course-there-are-now-rumors-of-an-official-remake/