[Feature Request] Option to hide Relay Headers and Footers

[tagd]

Current Behaviour:
Firefox Relay currently adds a header and footer to all forwarded emails. This includes the forwarding address, the trackers removed and a manage this mask button.

Request:
I propose adding a toggle in the Relay Settings menu that allows users to enable or disable the inclusion of the header and footer in forwarded emails.

Justification:
If a user hasn't opted to remove trackers the header provides no new information as the forwarding address is already shown in most mail clients, so the header just adds visual clutter and means less of an email can be seen at a glance, slowing down clearing the inbox.
While some users might prefer the transparency offered by the header and footer, I think most would prioritize a cleaner look.

[tagd]

I could also see this implemented at the mail client level as a toggle in a thunderbird extension(#1476) as thunderbird already shows emails as "[via Relay] [email protected]"

[BradNagel]

This is exactly what I was hoping would already have been implemented. It would be great if a reply would just remove header and footer so the other side couldn't see it.