Rated 1 out of 5 stars

I just wanted to specify that this problem didn't occure just for 1 contact, but for about 10 % of my contacts (in a total of 127 contacts), so this problem is not trivial for me.

The only method I found after of 1 full day of searching for extensions on the web for Thunderbird < = > Gmail synchronization is still synchronizing through my mobile :

1/ Thunderbird Funambol for Thunderbird < = > Nokia E71 (SyncML with Funambol server automated by Swim on the phone)

2 / Google Sync (Mail for exchange) in Nokia E71 < = > Gmail

This 2 step process works in both directions perfectly (with no data compatibility issues) to conduct the data between Thunderbird and Gmail automatically (updating the mobile at the same time), but the bad thing is that the same contact data are exchange twice each time, consuming mobile data, but I couldn't find any reliable solution to synchronize Gmail and Thunderbird directly at the moment :-(

This review is for a previous version of the add-on (0.8.10). 

Sync of Thunderbird first+last name with Google is on the http://zindus.com/i/roadmap

The reason First+Last on the phone syncs with Google is because the phone uses the ActiveSync protocol, whereas addons like Zindus have to use the Google Contacts API.