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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?
If I was able to develop an add on, what would this let me do? I am not an intense programmer. I know php and I know the basics of javascript. I'm a designer attempting to code ;)
Also is there a way to just do it purely in javascript.
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.