SmartUpscale by Marat Tanalin

Prevents blurring images which have their size in physical pixels an integer number of times larger than their natural size.

The extension may be useful when using high-DPI monitors, including 4K monitors used at OS-level zoom of 200%.

Images are processed once the page is fully loaded, as well as after dynamic changes on the page and on changing browser-level zoom.

Extension’s options allow to limit maximum image zoom that blur should be prevented at, and to disable blur globally if needed.