Thankfully it seems that this is only for Dark Reader on Edge (not Firefox or Chrome).

Still worrying to see them integrate this fraudulent service.

The firefox list is pretty much entirely overly specific youtube tweaks (that you should be using uBlock or a more fully featured Youtube extension for), "games in sidebar", and custom cursors. Bonzi buddy and toolbars, anyone?

Seriously, an NES emulator? As a browser addon? That needs permission to access "your data on all websites"?

This kind of extension is used when your device's output sucks and "cranking it to 140%" is the only way to make it audible (usually mangling the quality). Possibly used by hard-of-hearing users too. Or maybe they're stuck on monitor speakers and "just pay $15 for cheapo cans" isn't an option, and the monitor's OSD controls are clunky and awful (they always are).

I've used "volume booster" features in apps before when listening to badly mixed podcasts/audiobooks, because turning up the system volume on a phone makes other apps too loud. I could see a desktop situation that mirrors this for someone, a setting in FF is faster/easier than the windows volume mixer.

Ublock origin, noscript and canvas anti fingerprinting. Works great

Besides random extensions, I also recommend checking when the last update was if possible.

I used to use the KDE Plasma Integration extension but have since ditched it when I found out the last update was in 2024, a little over a year ago now. Unless they update it, I'mma treat that 1 year old extension like a 10 year old extension in terms of security.