Examine source code of Simple Colohanger

{
  "manifest_version": 2,
  "name": "Simple Color Changer",
  "version": "1.0",
  "description": "Changes background color to light yellow",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Change Color"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{454f4dc0-be7c-48e2-bc93-96cb4eedcc9d}"
    }
  }
}