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.
CloseReview for Allow Empty Subject by jpjunkbox
Rated 5 out of 5 stars
I've been using this with Tb2 and miss it in Tb3. Go to the author's site, there you can download the beta 0.4 which works with Tb3!
To create your own collections, you must have a Mozilla Add-ons account.