Welcome to فایرفاکس برای آندروید Add-ons.
Add extra features and styles to make فایرفاکس برای آندروید your own.
CloseReview for Provider for Google Calendar by paulsrose
Rated 4 out of 5 stars
Stopped working the last couple of days, however it looks like it's been updated and requires you to delete your calendars and add them back again. Seems to work again now, with an updated system - hope it is stable (not sure from other comments below).
Has been a good system for using Google Calendars with Thunderbird for a long time, so hoping that continues with this update.
To create your own collections, you must have a Mozilla Add-ons account.