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.

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2 revisions of this difference (10668 and 10721) were not found.

This is usually caused by following an outdated diff link to a page that has been deleted. Details can be found in the deletion log.

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