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:Firewall Manager/9.2/5/en

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To access the Firewall Manager, go to Control Panel → Firewall Manager or open an xterm and type pc-su pc-pfmanager. You will be prompted to input your password. Figure 8.17a shows the initial screen when you launch this utility:

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