With 6.8 installed, on current Firefox ESR (52.3.0) with plug in updated. OS: Mac El Capitan
1 pass extension moved itself to the other end of the toolbar and then stopped working / greyed out. After restarting Firefox, it works for a short period of time and then no response again eventually.
Have tried reinstalling the plug in twice.
1Password Version: 6.8
Extension Version: 4.6.9
OS Version: El Capitan
Sync Type: Dropbox