GContactSync, which is the only working extension recommended by Thunderbird to sync Google contacts (https://support.mozilla.org/en-US/kb/thunderbird-and-gmail), doesn't work yet in version 78 (https://github.com/jdgeenen/gcontactsync/issues/163). An upgrade to 78 may lead to unexpected breakage for many.
GContactSync, which is the only working extension recommended by Thunderbird to sync Google contacts (https:/ /support. mozilla. org/en- US/kb/thunderbi rd-and- gmail), doesn't work yet in version 78 (https:/ /github. com/jdgeenen/ gcontactsync/ issues/ 163). An upgrade to 78 may lead to unexpected breakage for many.