Proxy Timer - Extension for Google Chrome

Hello, I need an Extension for Google Chrome that changes the proxy (IP and Port) of Chrome browser (only changes the Chrome's Proxy, no modify the system proxy), similar to "QuickProxy" or "Proxy Switchy!" But the difference of my extension to other extensions is the functionality to modify the proxy in the set period time (eg every 5 seconds, 10 seconds, 15 seconds or customizable time), I need a Proxy Timer. The main functionalities: - Function enable / disable plugin - Change the proxy through a txt file - Set the time in seconds for the proxy changes - Random Proxy (with variation in seconds) - Loop (If the Loop = 0 the proxy always changes) Descriptive image in attach. Or in the link of Imageshack with the descriptive image: [login to view URL] I look forward bids for my project. If you need more details, send a message. Thank you.