Rated 5 out of 5 stars

Ajit please make "rich" the default style instead of "rich and slim".
Also mark compatible with Firefox 5.

This review is for a previous version of the add-on (0.7.7.20110418). 

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). 

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.

Rated 3 out of 5 stars

This causes items in the Firefox>Options menu to be reordered. Please fix that. Also see my previous reviews.

This review is for a previous version of the add-on (0.7.2.20110110). 

Sure

Sure

Rated 5 out of 5 stars

Should allow one word search with Paste and Go in Firefox 4. Also please hide engine name by default.

This review is for a previous version of the add-on (0.7.2.20110110). 

Rated 4 out of 5 stars

Add google instant search functionality.

This review is for a previous version of the add-on (0.7.2.20110110). 

Another addons

This should be done using another addon targeting Google Instant. I am sure there already are.