Follow the hat !

One feature, however, in my opinion important and which is absent from Google's Gmail API is the ability to include HTML signatures.

So I for my part, opted for the plugin "Blank Canvas", which provided a plugin for FireFox and Chrome. This browser I use primarily for the Google API, such as Gmail, Google Calendar, translator, analytics ... You can find them on the project page "Gmail Signatures".

This plugin integrates with GMail, and lets you create signatures in HTML with CSS and images. And this for your different addresses if like me you have a few.