This might be a duplicate of How to open Google Drive files in new window but that question is 5 years old and unanswered.
When I'm in drive.google.com and I open a G Suite file (either double-click or select & press enter) in Firefox it opens in a new window whereas in Chrome it opens in a new tab.
Why do they do that? Is this a browser-specific quirk or a Google setting (that I haven't found)? Is there a way to control the behavior? I'd like them both to open in tabs, but presumably the same answer would be relevant in the opposite direction too.