The Mozilla auto_config database requires an unusable CAPTCHA for Torified requests

I’ve noticed that the Mozilla configuration database (https://live.mozillamessaging.com/autoconfig/v1.1/) often presents a CAPTCHA when the request originates from Tor so the fetchFromISO method fails. We should ask if Mozilla can be more Tor-friendly.

That CAPTCHA is not displayed in the GUI so the user cannot do anything about it.

Related issues

Related to #15788 (closed)
Related to #6156

Original created by @anonym on 15387 (Redmine)

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