I have both Firefox and Dev edition on my notebook in a Windows 7 OS, and use the Firefox one as don't remembering history, while Dev edition remembers history. Both were updated to the latest version, 63.0b8 (64bit), few days ago, and were running smoothly until yesterday when while running it with 3 tabs suddenly the notebook stopped, and I couldn't do anything as couldn't even move mouse, so after few minutes I could open the Task Manager and find out that the 3 Firefox processes were consuming like 110% of CPU, so took like 10min for the processes to go down and finally I could see that Firefox was really consuming such CPU processing time, so I uninstalled both versions, and re-installed then again, and then seems problem was still happening with high CPU usage, so I tried to install the previous 63.0b7 version and always it was updated automatically to the 63.0b8 version, even that on Options I kept the manual update. As during the re-install of both versions I didn't see that it was using a different profile, then at the end, I lost the bookmarks I had in one profile, so now I can't run any previous version, as both Dev and normal edition always update automatically. Any chances to keep using older version and not this latest one ? thanks,