NoScript filtered a potential cross-site scripting (XSS)

[kurakura]

NoScript filtered a potential cross-site scripting (XSS) attempt from [chrome].
Techincal details have been logged to the Console.

Extension in Firefox not working anymore.
Why do I get this error and how to I solve it?

[barbaz]

NoScript filtered a potential cross-site scripting (XSS) attempt from [chrome].
Techincal details have been logged to the Console.

[...]
Why do I get this error and how to I solve it?

Please check the Browser Console (Ctrl-Shift-J) when this issue happens and post here any messages related to NoScript.
(related messages usually start with either "[NoScript" or "[ABE]"; if you don't know what's related, turn off CSS warnings and post everything else you see)

Extension in Firefox not working anymore.

Can you please be more specific and detailed?