On certain pages, my screen is flashing just happened I have it for now about three years

my screen is flashing on certain sites, or parts of some (images, grpahics, etc...). It just happened suddenly

Open System Preferences > Universal Access
Select the Hearing tab.
If the box next to; Flash screen when an alert sound occurs is selected, deselect that then restart your Mac.
If the box was not already checked, just to rule out any hardware issues, run the Apple Hardware Test

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