Glad to help.
Checking BitWarden's forums, I found they're making available a prior, unsupported version of BitWarden while they figure out this problem. I've installed it and its corresponding Safari extension, and it seems to be working fine.
⚠️ NO LONGER SUPPORTED This release is no longer functional or working with our current cloud services and infrastructure. You may still use the browser extension with Firefox and Chrome, as well ...
github.com
Despite its description, I'm using it with Safari 14.0.3.
I am so over the Apple Control paradigm. On the one hand, the security is a feature . . . .
On the other hand, Bitwarden capriciously disappeared from the Extensions TAB in Safari Preferences yesterday, never to be seen again . . . . until I found this post and link.
There is no solution (if there is, I've not found it--and no, I'm not familiar with Onyx and therefore do not trust it) for the missing Bitwarden Extension in Safari. The App Store will download the desktop Bitwarden all day long without any functional provision for the Safari Extension.
THANK YOU !
Arggg . . . spoke too soon. And then it was gone without notice, no forwarding address or phone number.
Click-copy-paste-wash-rinse-repeat . . . . or go looking for a new password manager after leaving LastPass in the ditch to move to Bitwarden.