Rated 4 out of 5 stars

Searching with a page open, causes results to open in a new tab. Disabling Omnibar fixes this. Is there a way to control it?

This review is for a previous version of the add-on (0.7.5.20110410).  This user has other reviews of this add-on.

Preference/another addon

Either you may have set browser.search.openintab to true or have another addon (most likely managing tabs) that is affecting this behavior.