ProxyControl

I have been a client of Proxys.io for 2 years. To be honest, their proxies are the best that I have seen. IPs are always working and internet connection is fast. Also their extension Proxy Control is extremely cool. At first, it is user-friendly and enabling to replace proxies with a single click. At second, the interface of this plugin is pretty. Thus, I recommend you Proxys.io and their browser extension Proxy Control.