Make ''calls'' to buttons thru Firefox/XUL

Project is simple and is to solve how to make firefox (XUL) make calls to these 2 buttons below. Am using firefox (XUl) to make calls to buttons in websites. For un-known reasons then firefox/XUL doesnt make calls to these 2 buttons below. 1) At url <[login to view URL]> then is un-able to make the call to click at the "button" at the bottom of the login page. 2) at url <[login to view URL]> then app1 doesn't click when I call button "create content" to be clicked at. Pls write why you are the right ocder for this proejct and what experience you have with making call in XUL?firefox.