gContactSync Frequently Asked Questions (FAQs)

What is gContactSync?

gContactSync is an add-on that synchronizes contacts between Google (Gmail) and an Address Book in Thunderbird.
You can synchronize multiple accounts with multiple address books, and it fully supports regular and hosted Google Accounts.

Click on a section to show or hide its contents.

Warning: Please backup your contacts before using gContactSync.

Which applications does it support?

Newer versions of gContactSync will only support Thunderbird. Older versions support Seamonkey and Postbox, too.

Why doesn't gContactSync work in Thunderbird 60?

See my blog post on this topic for details and instructions for Thunderbird 60 and 68.

Where can I download it?

Why do some of my contacts have strange nobody...@nowhere.invalid e-mail addresses?

Why do I get an error saying cookies are disabled?

Why do I see an error about being offline when I'm online?

Why do I see a 403 error when trying to login?

What happened to phone numbers? Why don't the phone columns match between the top and bottom half of the address book?

Why do I get an "Unresponsive Script" error?

Why do some contacts get updated when I haven't changed them?

Why can't I see the 10 extra properties I added in Gmail?

Why doesn't drag and drop work to mailing lists?

How can I add contacts to my address book without drag and drop?

Can I synchronize multiple address books?

Why does gContactSync always say "Synchronizing..."?

Where did the sync button go?

I sure would like the convenience of the automatic contact sync, but adding my gmail login credentials to this (or any) plugin makes me uneasy. How can I be sure this is secure?

Why does the summary show a different number of deleted contacts than what I was asked to confirm?

I use 2-step verification on my Google Account, can I still use gContactSync? (InvalidSectorFactor in the log)

Why aren't postal addresses synchronized?

I like gContactSync but don't know how to program, can I help?

When will birthdays, nicknames, websites and photos be synchronized?

Why do I see a message saying "One or more of your mailing lists has broken"?

Why can't I login?

Which attributes/fields are synchronized?