Discourse should be fixed … really … It’s always broken when someone shared a media that is blocked by NoScript … Discourse (and no other page) reverses the order of elements, so that overlays are not usable anymore (like quote-button). So I cannot quote what I want to answer here.
But I want to answer about screen scale that is always 200% after restarting phone. The solution is here.
About Firefox:
It’s not as bad as carlosgonz tells you. Google is paying much money to Mozilla for putting Google search engine as default. What else Mozilla does for that reason is speculative. Google is doing so to avoid antitrust actions I guess. And I also read on Git that Mozilla and Community are not doing everything what Google wants to get. For example there is a method on Chrome to get access to hardware memory (for example to write keybinds into your mouse or keyboard). Google wants that feature in Firefox, too. Mozilla does not implement this for security reasons.
It’s not a good idea to oversimplify things. That Google pays much money to Mozilla is a bad thing. It gives Google power that they shouldn’t have. Mozilla may does actions to create privacy holes because of Google, but maybe they also would do it without Google - who knows. But that doesn’t mean that Mozilla is now working for Google. They still can decide in another way as my example shows.