Examine source code of Speed Racer Html5

{
  "manifest_version": 2,
  "name": "Speed Racer",
  "version": "1.0",
  "description": "Speed Racer is all about being cautious in driving too fast. The race will take place in an oval track and after passing",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "48": "images/speed-logo.png"
    },
    "default_title": "Open Game Popup",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "images/speed-logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b567a0ec-9c12-4b5f-bede-deac0e92d204}"
    }
  }
}