I’ve been a long time FF user, and if I encounter a buggy site I just wouldn’t use it. Only problematic site is fucking Teams, and since I can’t just stop using it, I’ll switch to brave for the meeting and right back to FF after.

Tuta

If you just want to change your IP, there is no reason to use Mullvad. If you care about your privacy Mullvad is great. You can pay in xmr or even in cash by mail.

Get a sharpening stone, brand doesn’t matter imo. I have one with 1000 grid for rough sharpening and 6000 grid for making it really sharp. It does require some learning tho.

If you want to harden Firefox, use ffprofile.com. It makes creating a custom profile very easy, and it should have good defaults. This should provide you with decent privacy and also allows you to remove annoyances like sponsored sites.

Or if you are lazy, use LibreWolf which, as far as I know, basically does just that, but preconfigured for you.

For addons, I would go with: uBlock Origin, CanvasBlocker, Privacy Badger and Decentraleyes.

Finally you can test your setup with Panopticlick.

You should consider switching your user agent. It is often used to track and identify you, by sending stuff like OS and browser version.

You can find a better explanation, and your current user agent here: https://whatmyuseragent.com/

I also have the same WMF peeler. It’s really nice.