An old jetpack experiment

jsToggler.js

jetpack.statusBar.append({                                                 
  html: "<input type='button' value='Disable Javascript' id='jsEnabler' />",
  onReady: function(widget){
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefService).getBranch("");
    var jsEnabled = prefs.getBoolPref("javascript.enabled");
    var button = $(widget).find("#jsEnabler");
    if(!jsEnabled) button.val("Enable Javascript");
    $(widget).click(function(){
      if(jsEnabled) {
        jetpack.notifications.show( "Disabling Javascript" );
        prefs.setBoolPref("javascript.enabled", false);
        jsEnabled = prefs.getBoolPref("javascript.enabled");
        button.val("Enable Javascript");
      }else{
        jetpack.notifications.show( "Enabling Javascript" );
        prefs.setBoolPref("javascript.enabled", true);
        jsEnabled = prefs.getBoolPref("javascript.enabled");
        button.val("Disable Javascript");
      }
    });
  }
});