On: Windows 11 system components use the default brows...

[Traubenfuchs]

Afaik to make a program selectable as default browser, one needs to register it as a protocol handler for http and https urls in the registry.

https://stackoverflow.com/a/38205984/2306536

[aziaziazi → Traubenfuchs]

Does that mean I can use a headless browser as default ?

[Traubenfuchs → aziaziazi]

You can probably put any cmd-executable command as default, including headless browsers.

[numpad0 → Traubenfuchs]

I tried exactly that. Turns out it can't be a .bat or .ps1 for understandable reasons, it has to be an executable. So, my "default browser" on this machine I'm on is now an .exe that prints $1. It works.