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CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for Google Calendar Tab by yakakliker
Rated 5 out of 5 stars
Works again thanks to Torstein's advice.
Go to : "Tools > Options > Preferences > Security > Web Content".
Check Option "Accept cookies from sites"
To create your own collections, you must have a Mozilla Add-ons account.