Examine source code of fixed.link URL Management - Shortener and QR codes

{
  "manifest_version": 3,
  "name": "FixedLink",
  "version": "0.1.0",
  "description": "Shorten the page you are on, get a QR code, and share it without leaving the tab.",
  "permissions": [
    "activeTab",
    "storage",
    "identity",
    "contextMenus",
    "notifications"
  ],
  "host_permissions": [
    "https://fixed.link/*",
    "https://mail.google.com/*",
    "https://outlook.live.com/*",
    "https://outlook.office.com/*",
    "https://outlook.office365.com/*",
    "https://x.com/*",
    "https://twitter.com/*",
    "https://www.linkedin.com/*"
  ],
  "action": {
    "default_title": "Shorten this page",
    "default_popup": "popup/index.html"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": false
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Shorten this page"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://outlook.live.com/*",
        "https://outlook.office.com/*",
        "https://outlook.office365.com/*",
        "https://x.com/*",
        "https://twitter.com/*",
        "https://www.linkedin.com/*"
      ],
      "js": [
        "content/inline.js"
      ],
      "css": [
        "content/inline.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@fixed.link",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    }
  }
}