Description from extension meta
URLs opened from outside Chrome launch in a new window.
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Description from store
When you aren't using Chrome but open a URL that takes you to Chrome, it's unlikely that URL is related to any of tabs you already have open in other Chrome windows. So in general it's nice if the new URL opens in a fresh new Chrome window.
(Equivalent to Firefox's browser.link.open_external=2)
Mac multiple desktops (aka Spaces): When you're using multiple desktops on a Mac and open a URL from outside Chrome, if you don't already have a Chrome window on the current desktop then you're switched to some other desktop that does have a Chrome window. (Sometimes it happens even when you do already have a Chrome window on your current desktop!) You then need to navigate yourself back to the desktop that you were working in, and bring the Chrome tab with the new URL with you. This extension fixes that problem, the URL is always opened in a new window on the current desktop.
GitHub: https://github.com/paulmossman/external-tabless