Zoho "Mail To"

I do not know waht the problem is, I do use Firefox, and after using computer for 30 years, to my recall the "mail to" has been always a problem for all which with the time got worse, because people tends more to use webmail.
If you see firefox only has to webmail options (one for gmail) to select when you click a "mail to", and there is no add on for something like that to change it. And the other option for all is to use the local email in your pc, which happens to be usually outlook, but that is not what webmail users need or want.
And there is no an utility to do that either.
So is not possible to do a little email zoho client wich in fact does not email anything?
This is, an utility wich will be open when you click in your browser a "mail to" link, (all browsers have that, select application when you click "mail to")
So the application instead of beeing an email client, it will just call
https://www.zoho.com/mail/login.html?mailto&<"actual mailto link clicked">
So it will open the zoho webmail service, in whatever default browser the user has.
I can do it, but the key to this, is the zoho part, wich must accept a GET var named (lets say) email= at the login page, keep it while the user log in, an apply it in create message.
Thanks