Rated 5 out of 5 stars
Ajit, event could be null in Omnibar.handleSearchQuery, which leads to the two tabs problem. It seems to happen only with search suggestions.This review is for a previous version of the add-on (0.7.7.20110418.1-signed.1-signed). This user has a previous review of this add-on.
Thanks again. I will update with the fix soon.