Examine source code of Multiple URLs

{
  "manifest_version" : 3 ,
  "name" : "Multiple URLs",
  "version" : "1.0.0",
  "description" : "Paste a list of links and open them all at once, with a delay you control. Lines that are not links are searched.",
  "permissions" : [
    "storage" ,
    "search" 
  ],
  "background" : {
    "scripts" : [
      "background/background.js" 
    ]
  },
  "action" : {
    "default_popup" : "popup/popup.html",
    "default_icon" : {
      "16" : "icons/icon16.png",
      "32" : "icons/icon32.png",
      "48" : "icons/icon48.png"
    }
  },
  "icons" : {
    "16" : "icons/icon16.png",
    "32" : "icons/icon32.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "commands" : {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      },
      "description" : "Open the Multiple URLs popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfcbe9d8-81e6-40df-b291-b909d074e431}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  }
}