Playing video in browser glitches

Is there any way to fix this problem when I play videos in a browser. Doesn't matter if its Chrome or Mozilla. Same goes when playing gifs, tho they stabilized after a few loops. Video playbacks seem to be fine with VLC, even when network streaming. Watching Twitch streams seems fine.

My specs are:

• i7 920
• Ati Radeon 4870 1GB
• Main disk is SSD
• Windows 10 64 bit

Here's how it looks:

Any suggestions?