We’ve heard a lot about the open, HTML5-focused strategy behind Mozilla’s Firefox OS for mobile devices, but that will all be put to the test starting this week. The first two smartphones running Firefox OS — Keon and Peak, low-end developer models from Spanish startup company Geeksphone — are set to open for worldwide pre-order as early as tomorrow, possibly Wednesday, according to The Next Web. Pricing is still in flux, according to the report, but Keon should start at around 115 euros ($ 150 US) with tax included, and the Peak will debut at 180 Euros (about $ 234 US). Geeksphone is said to begin shipping globally by the end of the week. We’ve reached out to Mozilla and Geeksphone for more details and will update when we hear back.