Examine source code of Text Highlighter Pro

{
  "manifest_version": 2,
  "name": "Text Highlighter Pro",
  "version": "1.0",
  "description": "Highlight and save selected text on any website. Lightweight and privacy-respecting.",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "highlighter.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "Highlight Text"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6c4cee0-7ecd-471b-85ec-88a9e1524067}"
    }
  }
}