Sorry for the inconvenience. Known Navigation header breakage.
There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.
From PC-BSD Wiki
- A Template Manager has been added to Warden®. Templates can be added then used to create a new jail. For example, templates can be used to install different versions of FreeBSD and have been tested from FreeBSD 4.1.1 to FreeBSD-CURRENT.