[Quotecolors] plain text options in compose window

[Anita Moryadas]

I'm trying to have my quoted text in the compose window be black, but
the default color is blue. (I realize that it isn't possible atm to have
colored quote levels in the compose window - I'm trying to achieve one
single color of my choice.) I have set all of the quoted text levels to
black, so I do get a "plain text" effect in my message windows. Is there
a way for me to change the single color that the quoted text in the
compose window defaults to? If not through an extension, is there a line
of code that I could insert in my user.js or userContent.css files to
make all the text in the compose window, quoted and what I'm typing in,
be black?

Any help appreciated!

Anita Moryadas