Using a [HiDPI (aka Retina) display |https://en.wikipedia.org/wiki/Retina_display,] reproduce with the following steps:

1. Under a GitHub Organization's Project enable avatar:
   Projects > Repository Sources >  GitHub Organization > Enable Avatar
2. Go to the project's page: /job/<project>/
3. Look at the 48x48 pixel avatar on the top

Expected result: The avatar image shouldn't be blurry

Actual result: The avatar image is blurry/low resolution

It seems that the avatar image is fetched from GitHub with the same resolution as the dimension of the container: 

https://avatars.githubusercontent.com/u/<id>?v=4&s=48

I.e., 48 pixels wide for a 48 pixel wide img element. However, this is not sufficient resolution for a Retina display. Doubling the resolution by s=96 makes the image crisp.