Rated 5 out of 5 stars
can you add the same functionality for text-color? Thunderbird text-color tool is somewhat ... unusable for more multiple usage.
Tip: how to install on thunderbird 6/7/8/.. and higher?
well, use vim, which is able to edit ziped xpi files.
inavigate to: install.rdf
and change <em:maxVersion>7.*</em:maxVersion>
save & install it!