Examine source code of Random Color Changer

{
  "manifest_version": 2,
  "name": "Random Color Changer",
  "version": "1.0",
  "description": "Changes the color of the current webpage",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{be749041-a562-4a12-836d-038504d793db}"
    }
  }
}