Hi,
I believe that you consider the tab “new” if it was opened with the “file:///” protocol as it normally works for http(s).
{
"Command": "selectWindow",
"Target": "tab=open",
"Value": "https://www.bdm.vic.gov.au/research-and-family-history/search-your-family-history",
"Description": "Create a new browser tab - We will click on \"Search our Records Now\" to start a new session (get new GUID in URL)"
},