Examine source code of Friction for Facebook

{
  "name": "Friction for Facebook",
  "version": "0.1.1resigned1",
  "description": "Makes Facebook less addictive",
  "permissions": [
    "http://www.facebook.com/*",
    "https://www.facebook.com/*",
    "http://web.facebook.com/*",
    "https://web.facebook.com/*"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Friction for Facebook",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "toggle.js"
      ],
      "css": [
        "friction.css"
      ],
      "run_at": "document_end"
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{64cd1f0b-ae2d-4bab-bb40-31c3cdfc633c}"
    }
  }
}