Examine source code of Ereaderify

{
  "manifest_version" : 2 ,
  "name" : "Ereaderify",
  "version" : "0.6",
  "description" : "Helps browsing on a ereader: click on right (resp. left) 5% of the page does a page down (resp. up), sets black text on white background, and makes text bold. Includes switcher to reader mode.",
  "icons" : {
    "48" : "icons/ereaderify-48.png",
    "96" : "icons/ereaderify-96.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://*/*" 
      ],
      "js" : [
        "Readability.js" ,
        "ereaderify.js" 
      ],
      "css" : [
        "ereaderify.css" 
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ereaderify@example.org"
    }
  }
}