Examine source code of Instapaper Read

{
  "manifest_version": 2,
  "name": "instaread",
  "version": "1.1resigned1",
  "description": "Read your page in a better way",
  "icons": {
    "48": "icons/main.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "context.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f69e735-1ffb-4103-9cff-5d2bd5d3ca41}"
    }
  }
}