Examine source code of Quote Highlighter

{
  "manifest_version": 3,
  "name": "Quote Highlighter",
  "version": "2.0",
  "description": "Highlights text surrounded by quotation marks (\"...\", <<...>>,  «...») on sites. Fully customizable highlighter and text colors or have it dynamically choose them based on the website background.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "QuoteHighlighter@OpenAddons.null",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Quote Highlighter"
  },
  "icons": {
    "16": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}