Examine source code of Keyword Highlighter

{
  "manifest_version": 2,
  "name": "Keyword Highlighter",
  "version": "1.0",
  "description": "Automatically highlights user-defined keywords on webpages with customizable colors and styles.",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "ui/popup.html",
    "default_title": "Keyword Highlighter"
  },
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "ui/styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{68f9af58-67a3-49bd-bee7-003d13239c60}"
    }
  }
}