Rated 5 out of 5 stars

I got Vim from here: http://www.vim.org/download.php#pc
I got the unzip and zip from here: ftp://ftp.info-zip.org/pub/infozip/win32/
Check the readme to see which files you need.
I saved them to the Tbird extensions folder.

Vim wouldn't save the modified install.rdf into the .xpi past 87% (it isn't read-only or blocked and I have admin rights), so I had to jump through hoops:

1. rename quote_colors-0.3-tb+sm.xpi with .zip extension
2. unzip to dedicated folder (to avoid confusion)
3. right click install.rdf, Edit with Vim
4. save file
5. zip the quote_colors folder contents with 7-zip
6. rename the new .zip with .xpi extension
7. open Tbird and install .xpi