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This should be possible with a webfilter
in the CLI use
config webfilter content-header
edit 1
config entries
edit "application/x-shockwave-flash"
set action block
next
edit "video/x-f4v"
set action block
next
edit "video/x-flv"
set action block
next
end
Now apply this to your webfilter profile
config webfilter profile
edit
config web
set content-header-list 1
end
next
end
Seems you may have missed one app signature. "Adobe.Flash.Media.Playback".
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