IF statement for URL/website

You macro looks good, just the IF statement is wrong. You need to check for a substring. This works:

{
  "Name": "string",
  "CreationDate": "2020-7-14",
  "Commands": [
    {
      "Command": "executeScript",
      "Target": "return (window.location.href)",
      "Value": "u"
    },
    {
      "Command": "if_v2",
      "Target": "${u}.includes (\"wikipedia.org\") == true",
      "Value": ""
    },
    {
      "Command": "storeText",
      "Target": "id=firstHeading",
      "Value": "Heading"
    },
    {
      "Command": "else",
      "Target": "",
      "Value": ""
    },
    {
      "Command": "echo",
      "Target": "Not Wikipedia",
      "Value": "#shownotification"
    },
    {
      "Command": "end",
      "Target": "",
      "Value": ""
    }
  ]
}