[Snow]

One of my mods (pentapenguin) made a customised version that's really easy to install and users just need to click on a link to install it to the quick search (and we haven't had any problems with it).

Instructions:
1. create a folder in the /forum/ directory called mozillasearch e.g. yoursite.com/forum/mozillasearch/

2. in the attached aboho.src file, replace all of my urls with your own forum urls and then upload the files to the mozillasearch folder.

3. Edit Styles & Templates->Styles & Templates->Edit Template->Footer

Find

<a href="#top" onclick="self.scrollTo(0, 0); return false;">$vbphrase[top]</a>

add after

<script language="JavaScript" type="text/javascript">
function addAbohoSearch()
{
	if ((typeof window.sidebar == "object") && (typeof window.sidebar.addSearchEngine == "function"))
	{
	 window.sidebar.addSearchEngine(
	"http://www.aboho.com/forum/mozillasearch/aboho.src",
	"http://www.aboho.com/forum/mozillasearch/aboho.png",
	"aboho",
	"General");
	}
}

var browser = window.navigator.appName;

	if (browser.indexOf("Netscape") != -1)
	{
	document.write("- <a href='javascript:addAbohoSearch();'>Aboho Mozilla/Firefox Search Plugin");
	}

</script>

That's all, Mozilla/firefox users will see the link in the footer, other users wont. Of course you may want to rename the files to suit your forum and you will want to use your own icon, just remember to update all instances of aboho.png and aboho.src