Firefox has stopped development for Windows Mobile indefinitely. Thank you to our contributors for their continued support and feedback. The last release for Windows Mobile was 1.1 alpha 1 (download). We have stopped developing for Microsoft's mobile platform because Windows Phone 7 no longer allows developers to build C++ applications like Firefox, and Microsoft's new policies ban open-source software like Firefox from the Windows Phone Marketplace.

Not anytime soon if ever. https://wiki.mozilla.org/Mobile/Platforms#Other_Platforms Windows Mobile Firefox has stopped development for Windows Mobile indefinitely. Thank you to our contributors for their continued support and feedback. The last release for Windows Mobile was 1.1 alpha 1 (download). We have stopped developing for Microsoft's mobile platform because Windows Phone 7 no longer allows developers to build C++ applications like Firefox, and Microsoft's new policies ban open-source software like Firefox from the Windows Phone Marketplace.