[dnebdal]

Nah, I've looked at it alongside the author. It feels like extra work done for that single protocol (but none of their other weird ones) to handle it in a new and nonstandard way.

It would take a very weird bug to make the "select program for protocol" dialog ignore all entries except all versions of Edge; an even weirder coincidence to also ignore the relevant registry setting in favor of Edge when clicking links, and yet more so when when it only affects that protocol but not the other weird ms-specific ones.

Combined with how there was just a small burst of publicity over Firefox and Brave now also support capturing microsoft-edge: links, it feels like the "random bug" explanation is not the more likely one.