Examine source code of Odyssey Fun Cho Html5

{
  "manifest_version": 2,
  "name": "Odyssey Fun Cho Html5",
  "version": "1.0",
  "description": "Odyssey is free to play and fun right on the gadget, simple and takes no time to launch the website. Fun and no strings attached",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "128": "images/odyssey-logo.png"
    },
    "default_title": "Open Popup",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "images/odyssey-logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f015830-0706-45fc-818f-3ca283d8d8b9}"
    }
  }
}