Works for me using the KeepassXC browser addon.
- I reinstalled the snap firefox --beta (having previously removed it - I’ve been running it from the tar.gz installation as detailed on Mozilla’s webpage). Upon startup, I created a fresh profile, accepting the permissions dialog option for native messaging. Then I closed FF.
- Then I copied the contents of my existing profile folder from .mozilla/firefox/profile.name into this new snap profile folder at snap/firefox/common/.mozilla/firefox/profile.name after first deleting the existing contents.
- It all starts up (quite fast) and works immediately with all existing configs, addons and bookmarks. KeepassXC addon is fine and works normally.