Oceniono na 5 z 5 możliwych gwiazdek

As of version 0.11, this addon is now broken in Thunderbird 52, just in case anyone is still running this old version of Thunderbird for compatibility reasons with indispensable legacy addons and is wondering why tbsync has forgotten your CalDAV / CardDAV account information and has become unresponsive. It isn't tbsync, it's this. Rolling back to version 0.10 solves the problem.

Ta opinia jest o wcześniejszej wersji dodatku (0.11). 

Thanks for catching this. I updated the min version setting to TB60.