Rated 1 out of 5 stars
Even if you force install it via about:config, modified .xpi, or extensions like Add-on Compatibility Reporter, Manage Shortcuts does not works on Firefox 5.
Thanks ostkamp, ShortCutKey2URL is superior, only problem is no mouse support and CTRL+Space. It has an addressbar button and good compatibility though.
This add-on is always behind, and I'm sick of it.