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.

Translations:Adobe Flash Player preferences/9.2/4/en

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To access the utility shown in Figure 8.18a, use Control Panel → Adobe Flash Player preferences or open an xterm and type flash-player-properties.

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