Thanks for this awesome app, I love it!!!
Unfortunately, since version 6.x, sync with Google drive doesn't work.
In Enpas, I click on "configure sync" in parameters, then "Google drive", then it opens a page in Firefox "Enpass would like to: Have offline access", I click on "Allow", it seems to confirm for a second, but immediately redirects to the url "enpassauth://googledrive/?scope=https://www.googleapis.com/auth/drive.appdata&state=security_token_sinew&code=***************" (code hidden by me), which creates an error in Firefox "the url have not been recognized".
Firefox 65.0.1 with Ublock origin 1.18.6 desactivated on this page