Firefox: install -> autoupgrade -> reinstall = OS crashes (Assertion failed)

1) Install Firefox 39 from Application manager and run it
2) Firefox is downloading new update automatically
3) Restart firefox to apply update, but it fails (C:\Program Files\Mozilla Firefox\ folder is empty) (line 1596 in logfile)
4) Reinstall Firefox from Application manager
5) Reinstall fails, because ReactOS crashes (line 1841)

Log: http://pastebin.com/CuzgH7ez
Video: https://www.youtube.com/watch?v=9EFchyl2Q6M

It looks like there are are several different errors