Examine source code of Quick Dice

{
  "manifest_version": 2,
  "name": "Quick Dice",
  "version": "1.0",
  "description": "Lightweight and easy-to-play game on the game. Throwing a dice is a great way to look at the color of a dice",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "48": "images/quick-dice.png"
    },
    "default_title": "Open Game Popup",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "images/quick-dice.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfdee364-e2a6-4cc0-847e-1ef4db2fd47c}"
    }
  }
}