Examine source code of Email This

{
  "name": "__MSG_appName__",
  "author": "Abhayam",
  "version": "2.6.2",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "background": {
    "persistent": true,
    "scripts": [
      "scripts/vendor/browser-polyfill.js",
      "scripts/vendor/hyperapp.min.js",
      "scripts/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "bookmarks",
    "storage",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "scripts/vendor/browser-polyfill.js",
        "scripts/vendor/hyperapp.min.js",
        "scripts/vendor/Readability.js",
        "scripts/contentscript.js"
      ],
      "css": [
        "styles/popup.css"
      ],
      "run_at": "document_end",
      "all_frames": false
    },
    {
      "matches": [
        "http://news.ycombinator.com/*",
        "https://news.ycombinator.com/*"
      ],
      "js": [
        "scripts/content/modifiers/hn.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    },
    {
      "matches": [
        "http://twitter.com/*",
        "https://twitter.com/*"
      ],
      "js": [
        "scripts/content/modifiers/twitter.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    },
    {
      "matches": [
        "https://www.reddit.com/*",
        "http://www.reddit.com/*"
      ],
      "js": [
        "scripts/content/modifiers/reddit.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    },
    {
      "matches": [
        "https://*.wikipedia.org/*",
        "http://*.wikipedia.org/*",
        "https://*.m.wikipedia.org/*",
        "http://*.m.wikipedia.org/*"
      ],
      "js": [
        "scripts/content/modifiers/wikipedia.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "images/save.png",
    "images/save-success.png",
    "images/save-failure.png",
    "images/extract.png",
    "images/note-bg.png",
    "images/checkmark.gif",
    "images/lock.png",
    "options.html"
  ],
  "commands": {
    "save-page-shortcut": {
      "suggested_key": {
        "default": "Ctrl+Shift+U",
        "windows": "Ctrl+Shift+U",
        "mac": "Ctrl+Shift+U",
        "chromeos": "Ctrl+Shift+U",
        "linux": "Ctrl+Shift+U"
      },
      "description": "Email This Page"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/icon-19.png",
      "38": "icons/icon-38.png"
    },
    "default_title": "__MSG_btnTooltip__"
  },
  "applications": {
    "gecko": {
      "id": "emailthis@emailthis.me"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}