Rated 5 out of 5 stars

Launchy is one of my favorites because it is customizable.

In Firefox 3 the Launchy toolbar button wastes space on the toolbar with it's dropdown. The solution is to install the "Stylish" extension and then to install the following Style.

Launchy button remove space wasting drop-down(DM*)
http://userstyles.org/styles/13115

My example of launchy.xml can be found at
http://www.mvps.org/dmcritchie/firefox/code/launchy.txt

where I include browsers that were not automatically picked
up, and I can invoke other Firefox profiles as well, rather
than always having to go through Windows Quick Launch.
http://www.mvps.org/dmcritchie/firefox/firefox.htm#launchy
http://www.mvps.org/dmcritchie/firefox/quicklaunch.htm

For the other Firefox profiles note the use of a specific profile and the use of "-no-remote" because they are not the default profiles and not the default browser because that might be another Firefox version.

This review is for a previous version of the add-on (4.2.0).