urlview
$ sudo apt-get install urlview
$ cp /usr/share/doc/urlview/examples/sample.urlview .urlview # прочитать ....желательно.
дописать:
COMMAND firefox %s
---------------------------------
дописать в: .mutrc:
#забиндить Ctl+b
# You can call 'urlview' while in 'mutt' by pressing the Ctrl b keys.
# Put these macros in your $HOME/.muttrc file.
macro index \cb |urlview\n
macro pager \cb |urlview\n