This problem exists only in the browser. The appearance of artifacts is absolutely random, it may appear in different places on the browser page.
I know at least 3 people who have the same thing.
I do not remember from which version of the driver it started, but for a long time.
XFX Radeon RX 480 GTR Black Edition 8.0 GB
Windows 10 64bit Pro (1709)
Samsung S24E390HL 1920@1080 @60Hz HDMI
Asrock b150m pro4s Bios Version 7.10
Corsair cmpsu-620hx (620W)