text: var self = require('sdk/self');
  var pageMod = require("sdk/page-mod");
  
  pageMod.PageMod({
    include: "*.amazon.com",
    contentScriptFile:  self.data.url("backpack.js"),
    contentStyleFile: self.data.url("backpack.css"),
    contentScriptOptions: self.data.url("backpack.png")
  });
  