Rated 3 out of 5 stars

This plugin is totally incompatible with website which requests a login/password through a popup from Firefox:
Suppose that we navigate between items from drop down menu using arrows, if the first website requests a login then it closes the drop down menu to give focus to the login dialog box.

There's no miracle to fix that; maybe a little timeout before begining to display the preview?

This review is for a previous version of the add-on (4).