Excellent utility (see comments about my usage below). Rated 5 out of 5 stars

Works well with gmail
Has drop down to open file in docs
My main use is for PDF, Tiff,
Haven't tried other image files yet.
Used this since it first was introduced, always with gmail, no problems.
Thank you.

This review is for a previous version of the add-on (1.8.1-signed).