Examine source code of KeywordScanner

{
  "manifest_version": 2,
  "name": "KeywordScanner",
  "version": "1.0",
  "description": "Check keyword density on webpages with a sleek pop-up. Enter a term to see its count and percentage. Ideal for SEO.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "keyword_check.html",
    "default_icon": "scan_icon.png"
  },
  "icons": {
    "48": "scan_icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a49b8b8-a733-441b-bbaf-a70de4c6de9e}"
    }
  }
}