Sort Order of Search Engines in Firefox

How do I do it?

[physics]

I want to choose how the search engines are sorted in the firefox search box, but can't find it anywhere in the preferences.
The problem is, for example, I added msn search after adding a bunch of engines so it's way down in the list and I'd like it to be near the top.
At the very least it must be possible to edit a file with at text editor right?

[2by4]

type in the following in the location bar:

about:config

hit enter, use the search bar that appears, type in browser.search

The browser search order stuff will appear.

Right click on the window, and select 'new', select 'string', type in:

browser.search.order.3

then it will ask for the value, type in

MSN

Restart firefox, and msn should appear as number 3, I just tried it, works fine. I assume you can do this for each one, you just have to make sure you have the correct name each time.