To be clear, on xf.com, it goes like this:
- xf.com/community/ - when viewing the main list of forums
- xf.com/community/forums/have-you-seen/ - when viewing a specific forum - this is the only instance when you would have forums/forums, assuming you had xf.com installed in a directory called forums.
- xf.com/community/threads/xenforo-ajax-tutorial.8091/ - when viewing a specific thread, and the "xenforo-ajax-tutorial" text is optional in the admin cp.