Sgarla ul Web!
In this site you can find a Firefox langpack for a language similar to North-Western Lombard.
Lombard language and its variants are mainly spoken in Lombardy and in a region in the South of Switzerland. You can find more technical and authoritative details on the Ethnologue website.
Firefox 4.0
Advanced users who have no time to waste can find the langpack version 0.0.52 for Firefox 4.0 (RC1 or later) here (almost 100 KB).
Before rushing headlong, remember that this langpack is still illiterate and full of mistakes here and there. The website is not exempt too.
The langpack file is hosted at the website of the sgarlatur project.