Taking a page from Threadless, Mozilla is opening up its own online store featuring crowdsourced Firefox T-shirt designs. You can upload your own design, or pick from the gallery.

The store is built on Zazzle‘s platform, which handles the printing, shipping, and billing. Zazzle is rolling out partner stores focused on other online communities as well, but this could turn out to be the best example.

T-shirts are always a good money-maker on the Web. But how much of those Google subsidies can be replaced by T-shirt sales?