Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0
Thanks, that looks good, except that the Gnulib ChangeLog practice us to
have a first ChangeLog line of the form "packagename: phrase" (see the
ChangeLog file for examples). Please install after fixing that. I've
added you to the gnulib group.