Please see this article for a list of devices that are currently supported for Firefox OS builds: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS/Firefox_OS_build_prerequisites Unfortunately the ac100-10d isn't currently supported. This doesn't mean that you physically '''can't ''' install Firefox OS on it but it won't be at all straight forward and there won't be any official support. If you are a developer you may be able to build / modify the OS for your device. Have a read around on the developer network site. It might also be worth looking at the [http://forum.xda-developers.com/tags.php?tag=firefox+os XDA Developers] forum which is dedicated to customising / hacking phones. Also did you know that the apps in the Firefox marketplace can also be installed on any android device which supports Firefox for Android? You can download Firefox from the google play store or, if your device doesn't support the play store, you can download the apk from the FTP site. See here for the link: https://wiki.mozilla.org/Mobile/Platforms/Android. Be careful with this though because installing directly doesn't give you automatic security updates. You will need to update yourself, manually, to keep secure. Once you have Firefox installed follow the instructions here to install Firefox Marketplace apps: [https://support.mozilla.org/en-US/kb/how-access-firefox-marketplace?esab=a&s=apps+on+android&r=4&as=s#w_accessing-the-marketplace-from-an-android-device Accessing the Marketplace from an Android Device]