I had this issue a few months ago but it then seemed to resolve itself. Now it's back. I use passkey on a few sites like Google, Youtube, Hubspot... every time I attempt to use passkey on such sites Firefox locks up and I can't select anything on the page, a different tab. It just completely locks up and I have to restart it. I always deselect cookies. I don't have this issue on Safari so it is the only way I have to deal with this issue.