[Bug-gnuzilla] IceCat throws an error after closing

[NutCrackerson]

When i try to close the browser the usual way (by clicking the X 
button), IceCat runs into an issue where it tries to write to forbidden 
memory address, as seen in the attachment image, with first hex value 
being the offending instruction's address, and the second one is the 
aforementioned memory location. It only started behaving this way after 
I refreshed Windows (using its built-in system refresh function).  Any 
ideas what might have caused this? It's reproducible 100% of the times.
I'm using old 38.6.0 build on Windows 8.1 x64 (non-Professional edition).
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