Rated 5 out of 5 stars

For all fans here is the updated version. Now works with Firefox 3.0.*.

Install: http://lenselink.net/xpi/minimizetotray-0.0.1.2008102816+-fx+zm+sb+tb.xpi

Need more features? Look here: https://addons.mozilla.org/en-US/firefox/addon/2831