To expand on your second point in case anyone isn’t sure what you mean:

Different browsers render webpages slightly differently, because they use different “engines”. The most popular browsers are Chrome or Edge, both of these which use the Blink engine, whereas Firefox uses a different engine called Gecko.

Web developers want their websites to work for most people, so they develop websites that are optimized to run in Blink, which means they sometimes don’t look as intended on Gecko (Firefox). It’s not Firefox’s fault that developers are doing this – of course developers want to reach the most users possible. There’s nothing wrong with Gecko, either – if it were more popular, then developers would build sites for it instead of for Blink. But, this issue of sites breaking can sometimes turn people off.

(Conversely, I develop for Firefox first, so sometimes webpages I make don’t render properly in Chrome/Edge. That’s not ideal, but I don’t care much. I think Gecko is the better + more consistent engine, and I’m not interested in chasing mass appeal.)

I don’t think Steam users really represent the average person…

This is a stupid distinction to make. There is no speech that doesn’t affect people materially.

“Free speech” is a morally neutral thing. Most leftists don’t go on about “free speech” because it’s not a value we hold. We value tolerance of people of different races, genders, sexualities, and so on. The issue is not speech in general – it’s the content of speech that matters. “Free speech” sidesteps the issue of what is actually being said.