Up to a week ago, clicking a mailto: link in my browser would switch focus to Emacs with a mu4e compose buffer all set: To and Subject fields from the link, cursor correctly positioned, just what you want.
But then I updated lots of things, which I don't do often. I went from Monterey to Sonoma, from Emacs 27.2 to 29.3 (emacsformacos), from mu/mu4e god-knows-what to 1.12.5. And now clicking a mailto link just switches focus to Emacs: no draft message at all. Same behavior all browsers.
Anyone else experiencing this? What do I do about it?
/Larry Denenberg