Prior to attempting to uninstall version 19.0 and reinstall it, Safemode was working and usable. After reinstalling version 19.0 Firefox will crash during start up as it did before, and ask me to open in Safemode. Safemode will then crash/not open and the bug report service will open. Clicking "Restart" just opens up another bug report service windows on top of the first one. Clicking "X" or "Quit" does not, allowing me to exit the service window. Firefox's inability to be used properly began shortly after the latest windows update (installed during shutdown/next restart) around 1 AM on (I think) February 27th or 28th. I have not tried installing an older version. I did try to run the 20.0 Beta version, but I encountered the exact same problems. This is the only error code available to me, despite sending at least 5 or more. "bp-b4a3d0ce-8747-46a9-9c04-efc892130302" This error code "bp-f6520eaa-36e4-4098-a2a0-c61c32130302" has replaced the previous one after I tested the 20.0 beta version. Hope that helps.