Auto Old Reddit
Automatically switches from *://www.reddit.com/* to *://old.reddit.com/* thereby reinstating the old style & custom css. This should work on all platforms but I don't have access to many OS's so let me know if I'm wrong and I'll make a patch.
What is Auto Old Reddit?
Auto Old Reddit is a Firefox add-on that automatically redirects you from www.reddit.com to old.reddit.com, bringing back the beloved old style and custom CSS. It works on all platforms and offers a seamless Reddit browsing experience.
Auto Old Reddit may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Auto Old Reddit has earned a fairly good reputation and likely can be trusted.