I am running Firefox 51.0.1 (32-bit) on Windows 7 Professional SP1. I had been running previous versions of firefox with no issue. (I do not know the old version but I think next most recent) I recently updated Firefox to Firefox 51.0.1 and now have this issue. (Started happening right immediately after upgrade) Every time I close and reopen firefox, all tabs crash individually (with message "Bad news first: This tab has crashed"). If I refresh the pages individually they continue to give the error. If I refresh firefox from the troubleshooting information page the crashes are resolved, things work as normal! If I then close and reopen firefox I get the tab crashing again :(. If I then "refresh" firefox everything is OK again. If I open a second window or multiple tabs when things are working, the additional windows and tabs also work. Only have issue if I close and reopen firefox. I uninstalled firefox and reinstalled and issue persists. I deleted my profile directory and issue persists. After the uninstall / reinstall and profile removal I did not load any plugins or even reload bookmarks from old profile, and bad behavior still persisted. Please let me know any suggestions to resolve my issue. Thanks for the help and the great work on Firefox!