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Firefox update 40 error

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Black_Snow
Black_Snow
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Firefox notified me that a new update was available , I clicked it to install the update 40.0. Firefox closes, and then it won't start anymore. It just keep saying "Could not find the Mozilla runtime" Please help.

Firefox notified me that a new update was available , I clicked it to install the update 40.0. Firefox closes, and then it won't start anymore. It just keep saying "Could not find the Mozilla runtime" Please help.