Stopped using librewolf as updating it was a really cumbersome and also it being downstream from firefox meant it received all the security patches and updates later.
I have been using arkenfox user.js as my primary with a regular profile in cases where arkenfox breaks the website.
I haven't used mullvad but I do use protonvpn. On my android phone icici banking app doesn't work even while being whitelisted. Prime video needs to be whitelisted but functions. Didn't find an issue with Netflix. Haven't tested other platforms.
Outward is pretty fun (and at times bs and challenging). It is also not that long of a game to finish. The soundtrack is also good.