Thanks for this. Please consider creating a comparison matrix for your extension and Redirector, by Einar Egilsson, amo:5064
The most obvious difference I see is that his supports wildcards and regex while yours only the latter.
hopefully this extension will help avoid the annoyance of visiting fastmail.dm when I intend fastmail.fm. Sure I could use keyword (bookmark), and I do, but sometimes my splelling needs help but "awesome"bar does not spell check afaik.
Will this play nicely with NoScript and RequestPolicy?
Will this play nicely with Policy Manager, by Piro, amo:7066?
Certainly this provides a much more appealing alternative than facing the slow, uphill grind of learning JS for GreaseMonkey :)