Essential Goods - Know immediately when an essential you need is back in stock
Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...
HomeBreeze - Upfront prices and instant booking for complex home services
User-Agent Switcher and Manager - spoofs browser's User-Agent string.
Shopper.com - Uber for Coupon Codes
30 Seconds of Knowledge - Become a better developer, in every new tab.