Installed firebug lite but it doesn't do anything when clicked

[M Hendrickson]

I just installed the firebug lite extension. However, when I click on the firebug icon nothing happens. 

Thank you.

[alfonsoml]

Firebug lite is old and totally outdated, no one has worked on it for a very long time.
Nowadays, any browser has built in tools that are much better.