Rated 5 out of 5 stars

Working great.
One suggestion - don't add the Report Ads button by default. This is very rarely needed.

This review is for a previous version of the add-on (1.3.2).  This user has other reviews of this add-on.

The 'Report ads' button will be removed from the navigation toolbar as soon as AdBan's ad blocking filter database will become better than the most popular AdBlock Plus' ad filter lists. In the mean time you can remove the button yourself - see http://code.google.com/p/ad-ban-extensions/issues/detail?id=1 or https://ad-ban.appspot.com/ff/help#how_to_shrink_report_ads_button for the solution.