Firefox was working fine yesterday, but today it simply opens as a blank window. How can I fix this?

When I open Firefox, it appears as a blank, black window with nothing to click on. Everything was working normally last night. Problem only appeared this morning. I tried System Restore, but it failed to complete successfully.
I'm running Windows 7 on an MSI notebook. It's about three years old.

Here's a screenshot of what I'm experiencing.

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