I updated my Zone Alarm Free Firewall a few days ago and I ended up regretting doing so. It was doing a fine job tracking ads on the firefox toolbar before the update, and showing how many were blocked every time I go to a website. Now it does not show or detect any tracking ads(0) whatsoever in the same websites I used to frequent before, where it would normally would do so. I am not sure if this does this automatically in the background now, but I used to have a clear indication of the tracking ads that were blocked, at each website I visited.
The version I am using now is 13.3.209.000 on my Windows PC 8.1.