CrossBrowserTesting Local Connection lets you test behind your firewall in 1500+ real desktop and mobile browsers
NOTE: You need to have a CrossBrowserTesting account to use this extension.
CrossBrowserTesting.com local connection app lets you test internal web sites, local html files and websites behind your firewall in 1500+ browser and operating system combinations including real mobile devices.
CrossBrowserTesting.com enables you to test and debug your website across a wide range of popular operating systems, browsers and devices. Includes live interactive testing, screenshots and selenium tests to enable you to debug and find cross browser testing issues.
For more information including a free trial, go to http://crossbrowsertesting.com