Examine source code of Front-Enderman

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "zh_TW",
  "version": "1.2.1resigned1",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "front-enderman",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.facebook.com/*",
        "https://*.facebook.com/*"
      ],
      "css": [],
      "js": [
        "pixi.min.js",
        "bundle.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/*.png"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca018657-a86d-48c0-99ed-ec5f11d3c112}"
    }
  }
}