Examine source code of Highlight Keywordsad

{
  "manifest_version": 2,
  "name": "Highlight Keywords",
  "version": "1.0",
  "description": "Highlight a keyword on any webpage.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Highlight Keywords",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2138b60-743f-4617-9a99-6e111467a6a9}"
    }
  }
}