Earlier quoted context omitted.
My impression is that Reddit, Twitter and Quora are completely broken on mobile. My only possible conclusion is that these companies don't care about mobile users. Or at least not about casual mobile users who don't have the app installed. (I'm certainly not going to install a separate app for every website I visit; I already have a browser for that.)
I find twitter to be quite usable in mobile safari. I have the app too, but usually find myself still browsing in safari. Quora is just a broken site right now, mobile or not. reddit OTOH still seems to work okay on desktop. For a plaintext discussion forum that I prefer to read anonymously, theyve reaaaally screwed the pooch on mobile. I aboid reddit links whenever possible now, which is... sad.
Some of this could of course be related to privacy settings in Firefox.