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 Universe Nebula by Gunslinger
Rated 4 out of 5 stars
It's good, I like Space themes in general. Though I would give it a try.
To create your own collections, you must have a Mozilla Add-ons account.