Examine source code of WhatFont

{
  "manifest_version": 2,
  "name": "WhatFont",
  "version": "1.3",
  "description": "A wrapper for Chengyhin Liu's WhatFont tool",
  "homepage_url": "https://github.com/chengyin/WhatFont-Bookmarklet",
  "icons": {
    "48": "icons/whatfont-48.png",
    "96": "icons/whatfont-96.png"
  },
  "permissions": [
    "activeTab",
    "*://chengyinliu.com/*",
    "*://typekit.com/*",
    "*://www.google.com/webfonts/*",
    "http://fontdeck.com/"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "WhatFont",
    "default_icon": {
      "16": "icons/button16.png",
      "32": "icons/button32.png"
    },
    "theme_icons": [
      {
        "light": "icons/button32_light.png",
        "dark": "icons/button32.png",
        "size": 32
      },
      {
        "light": "icons/button16_light.png",
        "dark": "icons/button16.png",
        "size": 16
      }
    ]
  },
  "background": {
    "scripts": [
      "whatfont_button.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery.js",
        "whatfont_core.js",
        "whatfont_activate.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "wf.css"
  ]
}