To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseDeveloper reply by iharz
Rated 5 out of 5 stars
Crashes TB 24.6.0 every time I try to install it.
Edit: The beta version fixed the crashing on install.
try to install http://hcalendar.googlecode.com/files/hcalendar1.0.6.6-fx%2Btb.xpi (see details http://hcalendar.blogspot.co.il/2013/12/mozilla-extension-hcalendar-version.html)
To create your own collections, you must have a Mozilla Add-ons account.