Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt."
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.

Pages that link to "PC-BSD® for Linux Users/en"

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The following pages link to PC-BSD® for Linux Users/en:

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