I want to deleteAllCookies AT LOOP NUMBER 500 EVERY TIME,

You can delete all cookies and cache with this macro code, i run it inside other macro.

It works for firefox (i do not use chrome it’s too slow and require more memory)

{
  "Name": "Clear_Cookies_And_Cache",
  "CreationDate": "2020-2-15",
  "Commands": [
    {
      "Command": "store",
      "Target": "true",
      "Value": "!ERRORIGNORE"
    },
    {
      "Command": "store",
      "Target": "true",
      "Value": "!STATUSOK"
    },
    {
      "Command": "store",
      "Target": "FAST",
      "Value": "!REPLAYSPEED"
    },
    {
      "Command": "store",
      "Target": "1",
      "Value": "!TIMEOUT_WAIT"
    },
    {
      "Command": "bringBrowserToForeground",
      "Target": "",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_SHIFT+KEY_CTRL+KEY_DEL}",
      "Value": ""
    },
    {
      "Command": "pause",
      "Target": "5000",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_DOWN}",
      "Value": ""
    },
    {
      "Command": "XType",
      "Target": "${KEY_ENTER}",
      "Value": ""
    },
    {
      "Command": "pause",
      "Target": "10000",
      "Value": ""
    },
    {
      "Command": "echo",
      "Target": "Clear Browser History Completed",
      "Value": "#shownotification"
    }
  ]
}