Tor browser removes Authorization header on subdomains

I couldn't use epayments.com from tor-browser.

Their javascript making queries from https://my.epayments.com/ to https://api.epayments.com api.epayments.com send Access-Control-Allow-Origin: https://my.epayments.com allowing my.epayments.com to make cross domain request.

Javascript on my.epayments.com adds Authorization: Basic some token while making request. But tor browser removes this header, breaking authorization process. I googled and found that this is for better privacy, but could you make this feature disableable?

Trac:
Username: justuser