Paribus - Find out for free if online stores owe you a refund!
Mastering Bitcoin - The Bible for Bitcoin
Lolli - Earn bitcoin when you shop online
30 Seconds of Knowledge - Become a better developer, in every new tab.
Slice Watch - Get an email when an item you've added drops in price 💸
Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...