i do not remember how i have landed on youporn, can t tell...
however, in the past it just showed it was aware of an adblocker and that s it...;
NOW at youporn a popup shows up giving you the option to uninstall noscript or not; of course i clicked "cancel", ie don t do anything; but with this very low trick at restart...noscript was GONE!
ok, no problem, i will reinstall it:
apart the fact that strangely noscript does not appear easily at the top of the addons lists of firefox nor is easy to find (there s also some name cheater out there),
once i want to install firefox ITSELF blocks the installation of noscript claiming it is corrupt!
(bubble out of the addon icon on the top left,left from the address bar).
i immediately uninstalled fff and will reinstall it, and hope it will help...
however, i am not willing to experiment further,
i will not visit youporn again, it is only a source of troubles!
for fleshy issues i will disconnect and go out and find a girl - simple
and do recommend to do so too!
this is just to report and inviting you to investigate further and fight the evil 
all the best