A malfunctioning update to firefox quantum v57.0 destroyed all my user profile data ! 1. I have two laptops ( #1 and #2, both run windows 10). 2. On #1 all user profile data (bookmarks, passwords, etc.) were lost during automatic update to quantum version. 3. Machine #2 is in hibernate or sleep state (not updated to quantum butfirefox was active when put to sleep/hibernation). 4. Both machines where connected to the same firefox sync account. 5. Machine #1 (that lost all my data) is no longer connected to that account. 6. At the moment I know neither password or name to that account. I suppose all my data is still intact in the user profile on #2, but I'm afraid that when waking this machine, firefox will reactivate, automatically upgrade and destroy the date there also. How can I: A. prevent automatic upgrade to quantum when waking up laptop #2 (to prevent data loss) ? B. retrieve my private firefox data from #2 ? C. transfer this data to firefox quantum on #1 ? Please don't answer with any (well-meant) guesses, the data is too important for me to completely lose it by experimenting with half baked solutions.