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 Wikipedia by Shaun Anthony
Rated 5 out of 5 stars
Wikipedia is a great resource for quick, accurate information. You won't be able to use it as a proper source for academic research, but it satisfies most of your curiosities. I don't understand why it's not a default search engine already.
To create your own collections, you must have a Mozilla Add-ons account.