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There are lots of tuts on developing one. I would guess a search one would be a pretty easy one.
One you have it ready you can even request to have it put in the "addons" page and people can find it there as well.
I have no clue where to start. Doing a google search on firefox extensions brings me to a whole slew of topics. Do you have any resource or links to point me in the right direction?
For your search tool to "play nice" with Firefox then making an addon is the way to go.
You will have a bit of a learning curve if you are new to developing, but if you take the time then you will have a new trick to pull out of your bag and that is never a bad thing.
There are lots of stuff on the subject. I think I found a decent one but I am not sure about posting the link so I will message it to you.
Mods if a tut link is ok then I will edit it in. I never know anymore, sometimes they snip them sometimes not.