FYI Brave, and I suppose Chromium, has a flag that, when enabled, when typing an existing tab/already open website, shows the the existing tab instead of allowing to create duplicates by mistake.
Firefox offers this in the dropdown when typing a URL, there's a "Switch to Tab" option to take you straight to the existing tab instead of creating a duplicate.
Firefox has been doing that for a long while too. It recommends going to the already open tab but you can ignore that and open a nee tab anyway if you wish.
