The 1 Password add on 3.9.20 no longer shows on the Firefox 37 or 37.0.1 toolbar. In order for it to show you need to disable the add on, close FFox, reopen FF, enable the add on, close FF and then reopen. It then appears and stays until Firefox is closed. You then have to go through that process all over again. Unfortunately, I can't upgrade 1Password because the latest mac os x I can run is 10.7.5.
Has anyone encountered this problem and if so found a permanent fix?