I have written a fair amount about Google Plus and about how Google Chrome / Chrome extensions are changing my web behaviors. Lets put those two themes together... here are three great Google Plus Chrome extensions: 1. +Photo Zoom
I have glowingly written about the Facebook Photo Zoom extension and how every website should leverage this sort of interaction. I love it. And here it is for Google Plus.
Add the Google Plus header to your web experience. I wrote it about it here:
One major design flaw of Google Plus is the commenting system... which can get overwhelming very quickly. This extension fixes it.