Examine source code of Copy Page Info

{
  "manifest_version": 2,
  "name": "Copy Page Info",
  "version": "1.0.0",
  "description": "Copy the current tab's title, URL, or selected text using a custom format you control.",
  "browser_specific_settings": {
    "gecko": {
      "id": "copy-page-info@rg.local",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "storage",
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Copy Page Info",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  }
}