Works simply and helpfully with just about all my sign-in pages. A few do not but that might have to do with my 'No-Script' security. I recommend this add-on.

Best password manager. I used Bitwarden for a while but with the Alias feature I am all for ProtonPass now. I am now all in on their ecosystem as it is truly one of a kind. I love how I can use their SimpleLogin/ProtonPass Alias feature with my domain so I know which companies have sold my data and shut it down to prevent spam. Their team is also adding features super regularly. This team has been going hard to catch up with the other password managers and it shows. Now with Passkeys I can't see any reason not to swap. Anything you want you can vote on the uservoice and they are actively working on all the things great password managers have. I am sticking with Proton as they have a suite that fits most my privacy and security needs.

Very good pw manager. Still some things to improve but it seems like theyr working on it

Will be 5 stars when Firefox finally approves the new update supporting Passkeys.