Sorry for the inconvenience.  Known Navigation header breakage, its being "rebuilt" but forward nav should be ok now.
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:PC-BSD® for Linux Users/9.2/13/en

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Table 1.4b: Names for BSD and Linux Features [tables 1]
PC-BSD® Linux Description
PF iptables default firewall
/etc/rc.d/ for operating system and /usr/local/etc/rc.d/ for applications rc0.d/, rc1.d/, etc. in PC-BSD® the directories containing the startup scripts do not link to runlevels as there are no runlevels; system startup scripts are separated from third-party application scripts
/etc/ttys and /etc/rc.conf telinit and init.d/ terminals are configured in ttys and rc.conf indicates which services will start at boot time

Cite error: <ref> tags exist for a group named "tables", but no corresponding <references group="tables"/> tag was found
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