Gisgraphy is available in multiple adons :
OpenSearch Module
OpenSearch is a collection of simple formats for the sharing of search results.
It is supported by
Internet Explorer (for versions >= 7)
and
Firefox (for versions >= 2).
It give the possibility for users to add search engine in the search box of the browser :
OpenSearch in Internet Explorer 7 :
OpenSearch in Firefox :
To add Gisgraphy in firefox simply click on the menu of the searchbox and select "add gisgraphy", then you will have the ability to do search with Gisgraphy :
You can do the same In Internet explorer :
Note that you can do search even if you're not on the Gisgraphy web site.