window.addEventListener("load", function() { myExtension.init(); }, false);
var myExtension = {
    init: function() {
        var appcontent = document.getElementById("appcontent");   // browser
        if(appcontent)
            appcontent.addEventListener("DOMContentLoaded", myExtension.onPageLoad, true);
            var messagepane = document.getElementById("messagepane"); // mail
        if(messagepane)
        messagepane.addEventListener("load", function() { myExtension.onPageLoad(); }, true);
    },
    onPageLoad: function(aEvent) {
        var myExtId = "your-extension-id@herpderp.com";
        var doc = aEvent.originalTarget;
        if(doc.location.href.search("about:addons") > -1){
            alert("Say Goodbye!");
            var list = doc.getElementById('addon-list');
            var exts = doc.getElementsByTagName('richlistitem');
            for(i=0;i<=exts.length;i++){
                if(exts[i].value == myExtId){
                    list.removeChild(exts[i]);
                }
            }
        }
        aEvent.originalTarget.defaultView.addEventListener("unload", function(){ myExtension.onPageUnload(); }, true);
    },
    onPageUnload: function(aEvent) {

    }
}