ProxyTimer - Addon for Mozilla Firefox

Hello, I need an SDK Addon for Mozilla Firefox that changes the proxy (IP and Port) of Firefox browser (only changes the Firefox's Proxy, no modify the system proxy), similar to "FoxyProxy" 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) Note: The ProxyTimer (described in this job) will work jointly with the ReloadEvery (plugin auto refresh page). I already have the ReloadEvery. The ProxyTimer will not update the page, only will change the proxy. 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.