Rated 5 out of 5 stars

Great add-on. Would be nice to add panel with some informations for rss.

And how to translate it?

This review is for a previous version of the add-on (1.1). 

The localizations are here: <https://bitbucket.org/squib/mail-summaries/src/0806de36048e/chrome/locale>. Just make a patch with the necessary files and file a ticket or send a pull request on Bitbucket.