It is more so the phone/tablet device hardware that supports mobile Firefox rather. The Motorola Triumph uses a Qualcomm Snapdragon MSM8655 which is ARMv7 and has 512MB RAM (which is recommended min) and Android 2.2 (2.1 is min). Basically the mobile Firefox 9.0 release should run on it (there was no Fx 9.0.1 for Android), especially since you say the particular Beta build of 9.0 you have is able to. Just install the mobile Firefox 9.0 from Android Market. https://market.android.com/details?id=org.mozilla.firefox