Examine source code of Color Inverter

{
  "manifest_version": 2,
  "name": "Color Inverter",
  "version": "1.0",
  "description": "Invert colors of webpages for better readability in dark environments.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/invert-48.png",
    "default_popup": "popup.html",
    "default_title": "Toggle Color Inversion"
  },
  "icons": {
    "48": "icons/invert-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{071fd7be-060f-4c2b-860c-cdfdf14a07d8}"
    }
  }
}