Say: 1- you have 100 workstations, every workstation have firefox 70.0.1; 2 - for some reason a workstation X upgrade 70.0.1 to 70.0.2. It happened unfortunately; 3 - a user A that open its profile on X workstation upgrade his profile to 70.0.2; 4 - the day after he use a different workstation Y and his profile won't work, firefox will start with a default-release profile; 5 - IT manager (me) have to move (!) because you need to upgrade workstaton Y firefox to let the user A works, but this time it will upgrade to 70.0.3; 6 - return to 2 - because users move - (and "for some reason ... upgrade" become "you need to upgrade" of point 5) and everything become s**t! I need to avoid the profile upgrading at least on minor release to control the system even if I will leave firefox to other browser for my organisation. Please help! p.s.: sorry for my english p.s.2: let me say that one the best things of firefox is that profiles worked every where on every system every time. It is really annoying.