

Apologies, I don’t understand. Is any modern Linux distro lacking “general usability” or applications? Anyway, for Bazzite, there’s a bunch of ways to install software. (Though I haven’t used it myself.) I’m also not sure what you’re looking for when you’re saying “support”. Good documentation? A helpful community? Continued active development?
Just because there’s a strong focus on gaming doesn’t mean the distro would suddenly do bad at everything else, especially… general home/office use. Linux is good with that across the board. I hope I didn’t misunderstand. Please explain.
That probably counts as a privileged page, as in something uBlock Origin can’t access or modify.
Mozilla has probably been running another “experiment”, meaning not every user is affected. In the past they claimed it’s not advertisements because they are “continually looking for more ways to say thanks for using Firefox”. (Bullshit.) If you go to Settings > Home, you disable anything you don’t want to see, or just set your home page to a blank page, period.