The screen goes black for about 1/2 a second.

The screen goes black for about 1/2 a second. Is it time to panic?

I don't see any common link. Sometimes it is just one 'instance', sometimes it is several in a row. But there doesn't seem (to me) to be any sort of common circumstances. (Other than that I am using the computer!!)

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    You can try these steps in case of issues with web pages:
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    *Hold down the Shift key and left-click the Reload button
    *Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
    *Press "Command + Shift + R" (Mac)
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    *Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
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