Steps to reproduce: 1. Open an older nightly build (build id: 20170903220032) 2. Check for updates but do not restart browser to apply updates 3. Go to about:support and click the refresh nightly button to perform a browser refresh 4. Wait for nightly to restart and observe the sent pings Expected results: The update ping with reason success is sent from the new refreshed profile Actual results: The browser is updated to latest nightly but the update ping is not sent Notes/Issues: Verified in FF57(build id: 20170903220032)
Great work Madalin. This is an edge case that will be documented, along with the others, in bug 1398811.