Welcome to فایرفاکس برای آندروید Add-ons.
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CloseReview for Provider for Google Calendar by scoolteam
Rated 5 out of 5 stars
Works fine! One of the best calendar add-ons because win 10 calendar does not (yet?) show past events, in the android world it is, as far as I know, only Calengoo which presents all (!) events from the Google calendar.
Downloaded Thunderbird, Lightning and thirdly this "Provider for Google Calendar".
I'm not thee expert in all these things, just followed the instructions here:
https://support.mozilla.org/de/kb/mit-lightning-auf-google-kalender-zugreifen
Result: Thunderbird loads fairly quickly, only the first search-through took 30 sec with five years of events (average one entry a day). The whole thing took me five minutes.
To create your own collections, you must have a Mozilla Add-ons account.