Examine source code of Open Multiple URLs

{
  "name": "Open Multiple URLs",
  "version": "1.7.5",
  "manifest_version": 2,
  "description": "Opens a list of URLs",
  "homepage_url": "https://github.com/htrinter/Open-Multiple-URLs",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon19.png",
    "default_popup": "browseraction.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false,
    "type": "module"
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "permissions": [
    "storage",
    "search",
    "contextualIdentities",
    "cookies"
  ],
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "openmultipleurls@ustat.de"
    }
  }
}