Extension update check is not very colorblind / colourblind friendly.

In the extensions manager, after selecting "check all versions", it is almost impossible for a colorblind (or colourblind in the rest of the world!) user to which is which.

This is what you see:

With my particular defect (deuteranomaly), this is what I see (according to the simulator!)
Basically, I can't see the difference unless I zoom right in.

Just a simple CSS change to highlight the ones that need updating should do it.

Thanks!