Mozilla has published details of the first smartphones to be powered by its Firefox operating system, in a bid to challenge Apple and Google’s Android.
Two handsets, codenamed Keon and Peak, will be developed by a small Spanish firm called Geeksphone and will be targeted at developers ahead of the system's formal launch.
The platform is based on the HTML5 web programming language and is being marketed as offering software writers more "freedom" than alternatives.
Keon is the more basic model, including a 3.5in (8.9cm) screen, a 3MP (megapixel) camera and Qualcomm's low-end Snapdragon S1 processor.
Peak has a bigger 4.3in display, an 8MP camera and a more powerful Snapdragon S4. Mozilla noted this was probably "slightly faster" than the first generation devices that would be marketed to the public.
Geeksphone's phones will be made available for sale next month, but did not provide a price.
It said that when devices went on general sale they would be cheaper than many alternatives and would be targeted at emerging markets.