Redirects www.reddit.com URLs to old.reddit.com. The redirect can be toggled on/off by clicking the toolbar icon.
Do you prefer the old style of interface for Reddit more than the new one?
Use Toggle Old Reddit Redirect to automatically redirect all Reddit URLs to the 'old.' prefix.
You can toggle the redirect on and off by clicking the toolbar icon. When it is turned back on it will automatically redirect all open tabs currently on Reddit to the 'old.' URL.