Rated 4 out of 5 stars

A terrific extension, a staple in my add-on collection. Only two drawbacks: 1) it takes longer to check inbox than actually loading the gmail web page (which displays new messages).
2) 3 months since an update (as of this writing), so still no firefox 3.5 support

This review is for a previous version of the add-on (0.5.7.1).