I've had this issue for a while and I don't know what is causing it. This happens only on Linux.
Essentially some popups and images are really blurry as compared to other browsers.
Here are some examples, it might be hard to see on a screenshot but I can definitely see a difference.
Extension options (pop-up):
Regular images embedded into websites also tend to have this issue. Like for example these images I just embedded will look extra blurry on chrome compared to firefox or other browsers.
chromium-browser and they all have this issue. I'm using Ubuntu 16.04.
Also, I'm at 110% zoom by default but reducing it to 100% doesn't fix anything.
Disabling hardware acceleration in chrome fixes the issue. But I'd like to keep hardware acceleration so I don't know what is it about hardware acceleration that causes the problem.