Profile folder placed on network share, my profile.ini points to this location as \\server\folder. This has worked fine in all versions prior to FF58, after updating to 58, my bookmarks toolbar has gone missing, I get a message that FF lost my sessions, it can't retain window size (opens windowed instead of maximized)... I have tried to move the folder to another network share, but that yields the same result (problem). Having it local gives no issues. From my own investigation, it seems that FF58 is having problems renaming some files in the profile folder, the console log tells me this, due to locked because another process is using it (no, only FF). These files are almost the same files every time and they end up having a .tmp extension. If I manually fix these files, FF is back to normal - for that one session. What could be the reason for FF58 behaving like this? Is it exiting before the renaming of the files are completed, leaving the job halfdone? I am running FF58, (x64), Win 7 (x64). I would appreciate some help in resolving this issue.