User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150526004004 Steps to reproduce: System tested: OS X 10.10 Yosemite Firefox 36 (before update), Firefox 38 (after update) 1. Open an outdated version of Firefox on OS X. 2. Select Firefox > About Firefox. 3. Wait while the updates are downloaded. 4. Click "Restart to Update". The updated version of Firefox opens. 5. Click the Firefox menu in the OS X menu bar. Actual results: The Firefox menu contains only one entry: "Quit". Restarting Firefox again by quitting and re-opening it brings back the expected menu. Expected results: The Firefox menu should be complete (About Firefox, Preferences, etc.)