AsenDURE messaged me on MSN yesterday about having a search plugin for any site integrated into Firefox. After having a look at it, I gave it a shot and now this site has a search plugin which you can install into Firefox 2.0 and search directly from the search bar. ;)
Following the steps from here, your currently selected search plugin (by default Google) would glow blue when it automatically detects a search plugin. And the following screenshots on how to add and use it are rather self explanatory.
There should be a 16×16 icon image for it, but I don’t have one for it now though. ;)