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nsAppShell:Event Window:firefox.exe-Application Error message when shutting down Firefox, how do I get rid of this error message?

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I click to exit Firefox and the above error message & below this error message it says the following: The instruction at 0x776fe144 referenced memory at 0xfffffffff. The memory could not be read. Click on OK to terminate the program.

The only change I have made recently was to upgrade to the current Firefox version 30.0, the above message showed up after the upgrade.

I click to exit Firefox and the above error message & below this error message it says the following: The instruction at 0x776fe144 referenced memory at 0xfffffffff. The memory could not be read. Click on OK to terminate the program. The only change I have made recently was to upgrade to the current Firefox version 30.0, the above message showed up after the upgrade.

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Shockwave Flash 14.0 r0 Shockwave Flash 12.0 r0 Shockwave Flash 11.9 r900

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