Examine source code of Infinite Craft Extension

{
  "manifest_version": 2,
  "name": "Infinite Craft Extension",
  "version": "1.0",
  "description": "Add items to your Infinite Craft game list.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ad8642d-5fdc-4703-bef0-d9bfcdd2967e}"
    }
  }
}