Just updated. Edge of screen flashes now red once the opening link

Using Windows 7, 64 bit.
I've just updated to the latest version of Firefox.
When I open Firefox the border of the Office behind the toolbar (top) and taskbar (bottom) of the screen is lit red momentarily. This also occurs whenever I open a new link or a new window.
It's very frightening. I scanned my hd with Security Essentials, AdAware and Malwarebytes and no infection exist.
Recommend McAfee site has been disabled in update?

I changed my Firefox Persona of space is Cool and now I have this problem.

Tags: Firefox

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