Examine source code of Simple Highlighter

{
  "manifest_version": 2,
  "name": "Simple Highlighter",
  "version": "3.0",
  "description": "A sleek text highlighter with modern design",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-highlighter@yourdomain.com"
    }
  }
}