iCloud Mail 'mailto:' link handler for Desktop browsers

Hi there,

At first I posted it under 'iCloud on PC', but it really belongs here.

I'm using a Windows PC with a Firefox browser and I wish that when I click links on the web that start with "maillto:" that it will work with the iCloud.com Mail service.

Links that start with "mailto:" should open a new tab with a new email message on icloud.com's Mail with the address that comes after the the "mailto:" part inserted in the "To:" field. As far as I know, many web-based Email services aid users to set this setting in their browser so these links will be redirected to their service, but it seems that icloud.com's Mail doesn't do much to help in that regard.

So far I managed to add a new 'mailto' handler in the settings, but the address I found on the internet that is joined by that handler doesn't work unfortunately. (The invalid handler link was: https://www.icloud.com/message/current/en-us/#compose?to=%s)

I most importantly need the address that will make the handler work with icloud.com's Mail.

Thank you for reading and for anyone who tries to help :)