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CloseReview for Google Calendar Tab by Califek
Rated 5 out of 5 stars
Great plugin for Thunderbird, this replaced lightning on my computer because the latter was too buggy. I've been using this extension for around a year and did not experience any of the above problems (I'm using TB v3.1.9). This does just what it says.
This review is for a previous version of the add-on (3.5).To create your own collections, you must have a Mozilla Add-ons account.