Hmm, don't you think TB is just showing you all the HTM bloat/cruft lurking beneath the surface? Would you want it to automatically edit out any of the existing content?

Users who send HTML to you will probably not understand what they're doing wrong ( ;-) ) nor appreciate what you're doing to their messages when you reply in plain text.

Well, it is usually not needed in the email when you use colors etc.

The thing is that the conversion is not correct. If I force TB to show plain text (from menu) instead of HTML and reply it, everything is perfect - but I would not see any HTML and I don't want it.

This is HTML source <a href="mailto:mymail@mail.com" target="_blank">mymail@mail.com</a>

And you get this when you convert it to plain text mymail@mail.com <mailto:mymail@mail.com>

You should get only the email back mymail@mail.com

When the person replies back in HTML format, it converts email addresses to HTML, so there are 2 links of the same email. Then I convert it to plain text and you have 4 addresses.

I made a small test with this and sent it in HTML format <a href="mailto:test@mail.com">User</a> <a href="mailto:mail@mail.com">mail@mail.com</a>

(User <mailto:test@mail.com> mail@mail.com)

First line is always converted correctly and remains the same, only the second line is duplicated into mymail@mail.com <mailto:mymail@mail.com>

Basically, if the "name" and email address is the same, only the email should remain which does not happen now

I see, it is reported bug already https://bugzilla.mozilla.org/show_bug.cgi?id=780365