[Conkeror] Firefox blocks installation of Conkeror?

[Brian May]

>>>>> "John" == John J Foerch <jjfoerch at earthlink.net> writes:

    John> Joe Fineman <joe_f at verizon.net> writes:
    >> 
    >> Conkeror looks like what I have been wishing for for years, but
    >> I am not a computer professional and cannot imagine what all
    >> this means.  I would be grateful for advice.

    John> The current development version is no longer a firefox
    John> extenstion at all, but a xulrunner application.  It's
    John> available via git at <http://repo.or.cz/w/conkeror.git>.
    John> The best branch is currently `experimental-buffers'.  If you
    John> have questions about installation, flag us down in the
    John> #conkeror channel on freenode.

What git commands do I need to use to checkout a branch?
-- 
Brian May <bam at snoopy.apana.org.au>