Rated 5 out of 5 stars

By the means of this extension you can 1. easily choose a search engine in the search bar 2. using the context menu quickly search for the selected text by any of your search engine. By grayscaling the search bar icons you can suppress the gaudy appearance of the search bar! (This option is a bit hidden)

This review is for a previous version of the add-on (3.0.14).  This user has a previous review of this add-on.