Examine source code of Text Bookmark Navigator

{
  "manifest_version": 3,
  "name": "Text Bookmark Navigator",
  "version": "1.0",
  "description": "Bookmark selected text and navigate back precisely",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chat-bookmarks@example.com"
    }
  }
}