Switch to old Reddit by Felix Binder

Adds an option on the Context Menu to switch from the new reddit website to the old reddit website. Only works when the active tab is on <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/a1b4e6d4424a017e62e400fca715d2086015588f28c068da20c3c5217a52b04d/http%3A//www.reddit.com" rel="nofollow">www.reddit.com</a>.