Just keep in mind that it hardcodes the operation to the last ten generations of commits, which is not necessarily what you want. See "SPECIFYING REVISIONS" in the man page for git-rev-parse (http://www.kernel.org/pub/software/scm/git/docs/v1.6.1/git-r...) for all the different ways you can format the HEAD~10 part.
Then again, I have an alias "git cia" for "commit -a"... Just remember where to look it up if you need something more elaborate.
The Firefox plugin at addons.mozilla.org is messed up (I looked at the contents and found it's an html document). However, the "Benefit right away by installing the firefox plugin" link has a working xpi. Just a heads-up for anyone wondering why they can't install the plugin. :-)
EDIT: Oh, and the statusbar icon is utterly pointless.