mozilla addon

Hi, first i don't know whether this is right section for this question or not!!
Some time ago I saw a mozilla/FireFox addon for click button (send button) which could actually show where the current information will be sent. If someone know kindly share, i can't find it now.
thanks in advance.

firefox add-ons can be found on the mozilla website.

i tired to find there but couldn't find the described above one!!