Firefox Extension: Execute action when user closes the browser

Question

I have an extension with a sidebar, when the user close the sidebar a method is called. I need to diference when the user close the sidebar than when he closes the browser.

pseudo code:

if (userClosedBrowser){
 //do something
}else if(userClosedSidebar){
 //do something else
}

Answer 1

You can listen for the "quit-application" observer topic. Or, if you want to be able to stop the quit, you can listen for "quit-application-requested".