Why does my iMac screen flicker only when using Safari? It doesn't happen with Firefox.

Yesterday, I had an issue with OS X, causing my screen to go black upon waking up my pc. Come to find out through the Apple Forum, that when the OS X was originally installed, it was not a complete install. Once I received the fix solution, completing the OS X install, (10.9.3) everything was back to normal, so it seemed.
Now, when using Safari, the whole page flickers and so forth, including the address bar. I never had problems with the screen prior to this. Also, it doe not occur when using Firefox.
Is there a fix for this? or an adjustment that can be made. This never happened prior to the OS X install, which was about 2 months ago.

Troubleshoot Safari extensions ..
From the Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that OFF, quit and relaunch Safari to test.
If that helped, turn one extension on then quit and relaunch Safari to test until you find the incompatible extension then click uninstall.

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