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.

Translations:Warden®/10.0/38/en

From PC-BSD Wiki
Jump to: navigation, search

Include system source: if you check this box, make sure that /usr/src/ exists on the PC-BSD system as the source is copied to the jail from this location. If it is not installed, use Control Panel → System Manager → Tasks ➜ Fetch System Source to install it.

Personal tools

Variants
Actions
Navigation
Toolbox