I have been switching from Brave to Mullvad Browser and one odd issue I am running into is that I am not able to use my yubikey to login to sites such as simplelogin or protonmail anymore.
My guess is its something with noscript as the other addons I used on Brave but, even if I mark an entire site as trusted the yubikey prompt still seems to be blocked.
Noscript blocks all JavaScript by default, make a exaction for yubikey in the options of noscript