Review for Google Calendar Tab by geographika
Rated 5 out of 5 stars
Very handy. Would be nice if the tab could be set to be open by default (maybe I'm missing a setting somewhere?).
Also if you get stuck with a Google "verify" email page, and your password doesn't work, go to Tools >> Options >> Security >> Web Content, and delete the Google cookie to log back in.
To create your own collections, you must have a Mozilla Add-ons account.