How do I make an addon run a function whenever a page is loaded.

Question

I am developing a firefox addon and I want it to add an event listener on every form field. How would I implement this.

Answer 1

// 'extension is loaded', you probably have this
window.addEventListener("load", function() {
    // run your_function() when page is loaded and DOM is ready
    gBrowser.addEventListener("DOMContentLoaded", your_function, true);
}, false);