Examine source code of Print for Firefox

{
  "manifest_version": 3,
  "short_name": "__MSG_name__",
  "homepage_url": "https://www.stefanvd.net/support/",
  "description": "__MSG_description__",
  "author": "Stefan vd",
  "version": "2.4.2",
  "icons": {
    "16": "images/icon16.png",
    "24": "images/icon24.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "default_locale": "en",
  "content_security_policy": {
    "extension_pages": "default-src 'none'; style-src 'self'; media-src https://www.stefanvd.net; frame-src https://www.youtube.com https://www.stefanvd.net; connect-src https://www.stefanvd.net; script-src 'self'; img-src 'self' https://www.stefanvd.net * data:; object-src 'none'"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "name": "__MSG_name__",
  "background": {
    "scripts": [
      "scripts/constants.js",
      "scripts/background.js"
    ]
  },
  "action": {
    "default_title": "__MSG_name__",
    "default_icon": {
      "19": "images/default.png",
      "38": "images/default@2x.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+P",
        "mac": "MacCtrl+Shift+P"
      }
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "print@stefanvd.net",
      "strict_min_version": "113.0"
    },
    "gecko_android": {}
  }
}