More than a year back, Aibek wrote a great list of 35 must-have thunderbird addons. Since then, a lot of great addons have been created and some of the older addons have also evolved to become better ones. As such, it is time for us to re-visit the list of Thunderbird addons and update our readers with the latest list of must-have Thunderbird addons. (If you never heard of Thunderbird before, it's