Firefox 80+ has a logins-backup.json file in the profile folder that can be used in case of issues with logins.json or to undo an accidental delete/update of a password. You can check if you can find this logins-backup.json file in the profile folder or in a backup.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Make sure to keep a backup of the current logins.json and logins-backup.json before replacing logins.json with logins-backup.json with Firefox closed.

You can open logins-backup.json in a Firefox tab to check whether you see encrypted login data for those domains.

• https://firefox-source-docs.mozilla.org/devtools-user/json_viewer/

Thanks for the suggestion but I don't see that logins-backup.json - this is a newly installed firefox instance (new computer). I should've mentioned that. I was hoping since I had everything synced using a firefox profile/account there might possibly be some way to restore the sites/credentials even though I accidentally did remove them when cleaning things up. I don't have my old computer anymore.  :-(

If you did cleanup the logins while connected to Sync then this has propagated to Sync and the logins have have been removed from Sync as well with no way to recover them unless you have them on a desktop device that isn't connected to Sync.