SeleniumProxyAuthentication.Firefox (nuget): Providing Support of Auth, Chain, Rotating Proxies For Selenium FireFox Driver Support All Kind of Proxy types  ! You need to download the "Nightly" or "Developer Edition" of firefox to use this library because in the original browser, extensions should be verify before installing since version 43  Also checkout the github page to read the documentaion
Keywords: Selenium|Proxy|Auth|Authentication|HTTP|Chain|Rotating|Proxies|Firefox|FirefoxDriver|WebDriver|username|password