Examine source code of URL&p

{
  "manifest_version": 2,
  "name": "URL&p",
  "version": "3.2resigned1",
  "author": "Irina Ivanova",
  "developer": {
    "name": "Irina Ivanova",
    "url": "https://irina-ivanova.gitlab.io"
  },
  "description": "Opens URL with one parameter in new tab",
  "homepage_url": "https://gitlab.com/irina-ivanova-extensions/URL-With-Parameter-Opener-FF",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "URL&p",
    "default_popup": "index.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-z1NBlw1I81v0zA@jetpack"
    }
  }
}