Don’t know if they work on Debian, but try the shortcuts that are available under Windows:
Ctrl + Shift + Y to open/close the Bitwarden extension.
Ctrl + Shift + L to fill in the credentials
Ctrl + V to fill in the matching TOTP
This is a highly requested feature. Cast your vote here:
I add system passwords the same way I do with those for web-sites or apps; hoping that one day I will be able to use them for desktop-apps.