People sure like to dunk on PHP. I’ll take whatever flak for this, but this is the kind of meme a .NET fanboy or Ruby on Rails bro would make when they haven’t touched any languages other then their prescious, and don’t know wtf they’re talking about.
PHP, after all these years, is STILL running 78% of all sites. That’s not because it’s garbage or the worst. It’s solid, reliable, mature and very well documented. And I say this as someone who has gladly moved to Python, but also work in in others.
Of course they can be disabled. But sites are not all built the same way, so there isn’t one silver bullet we can tell you about to disable them everywhere. On mobile it’s even more difficult because access to browser plugins is more limited, along with developer features within the browser.
I also use FF on Android, and until recently was also using Reddit. There isn’t a good way to remove that bar.