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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Wildcards such as "*.wikipedia.org" may be used. Needs at least a top-level domain, for example "*.org".
Supported protocols: http://, https://, ftp://, irc://, ircs://, gopher://, telnet://, nntp://, worldwind://, mailto:, news:, svn://, git://, mms:// (defaults to http:// if no protocol is specified).

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