getting browser to stick to one window

Hi guys!

I'm stuck with something that seemed silly and easy to sort out but now gives me doubts if there's a solutions at all...

the ; max launch browser command opens URLs in new windows, is there a way to use the same window always and not new ones? I need the old URL to get replaced with the new URL using the same window. It can't be new tabs either, I really need it to be just one page all the time. So the triggering is fantastic, but any ideas on the issue of getting hundreds of browser windows? been trying preferences in Safari, Firefox... happy to download other browsers if that solves it. Don't think this can be solved in Max. My guess is that it's a setting outside

Many thanks for advice

David