Make Gmail the default mailto: link in Safari
Previously, the method described here (https://ithelp.brown.edu/kb/articles/open-email-links-with-gmail-in-safari) worked well to allow email links to be opened with Gmail in Safari. In Safari 12.0, this type of extension no longer works. Instead, a paid app (Open With - Browser, Mail Client, Gmail picker on the Mac App Store) exists in the Mac Store but it seems crazy to have to spend $5 to get this functionality.
Any suggestions?
MacBook Pro (Retina, 13-inch,Early 2015), macOS Mojave (10.14.1), Safari 12.0.1