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.

Category:Preface

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Handbook preface.

Pages in category ‘Preface’

The following 10 pages are in this category, out of 10 total.

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