Rated 5 out of 5 stars

Second-best add-on I ever downloaded (after Smart Bookmarks Bar). I only use it for searching a notion or a word as global search in all of the mails. For that purpose, this add-on ads a new search term called "expression" as overall search in the existing search box. It's turbo fast. Will explore its other functions later.

This review is for a previous version of the add-on (0.6).