Examine source code of Page Element Highlighter

{
  "manifest_version": 2,
  "name": "Page Element Highlighter",
  "version": "1.0",
  "description": "Highlight and outline HTML elements for debugging and layout analysis with customizable colors",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "highlighter.js"
      ],
      "css": [
        "highlighter.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Page Element Highlighter",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25093a85-9ec5-46e6-8b63-3286f0adccf6}"
    }
  }
}