A related thread on this is https://support.mozilla.org/en-US/questions/942368

The two phones look very similar on the outside. One big difference is this phone is the only phone available to customers wanting Sprint Direct Connect and an Android smart phone. And it's also the only Sprint Android with a mil-spec case. The other phone has less memory (flash and ram) a smaller cpu, and a different GPU.

SYSTEM INFO System Version 55.11.69.XT603.Sprint.en.US

Android OS Version 2.3.5 (Gingerbread)

Baseband version Blur_version.55.11.69.XT603.Sprint.en.US

Kernel Version 2.6.35.7-perf+ hudsoncm@il93lnxdroid83 #1

Build number 5.5.1Q-117_PAX-69

SYSTEM TECH SPECS Release:Date: October, 2011

Chipset: Qualcomm Snapdragon MSM8655T

CPU: 1.2 GHz Scorpion

GPU:1200 MHz Adreno 205 (GPU API Conformance: OpenGL ES 1.1 & 2.0, OpenVG 1.1, EGL 1.4, Direct3D Mobile, SVGT 1.2 & Direct Draw & GDI)

RAM: 1024MB ( 814MB free)

System Flash Memory: 4GB (1.31GB free)

Optional Flash MicroSD Installed: 8GB (6.34GB free)

Display: 480 x 640, 3.1 inches, 16M colors, TFT LCD Capacitive touchscreen, Accelerometer sensor for UI auto-rotate, Corning Gorilla glass display.

MIL-STD-810F certified - salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant

(GPU Ref: http://en.wikipedia.org/wiki/Imageon#Renaming_to_Adreno)

Thank You James, as you did find more than I did! I see the OP is asking about the same phone, but the answer they're getting is about the wrong phone.

I did notice that on phone one, it is running an older OS release. I hope I've posted something to run with. And getting on Bugzilla is a little over the top for me.

Thanks

Ok, Now I think I'm seeing the issue. Firefox does not want to run on Google Play phones. As the Android Developer readme for "SmallScreens" reads as follows:

" android:smallScreens

   Indicates whether the application supports smaller screen form-factors. A small screen is defined as one with a smaller aspect ratio than the "normal" (traditional HVGA) screen. An application that does not support small screens will not be available for small screen devices from external services (such as Google Play), because there is little the platform can do to make such an application work on a smaller screen. This is "true" by default. "

(ref: http://developer.android.com/guide/topics/manifest/supports-screens-element.html )

So when Firefox modified the default by adding the code.....

      1.8  #ifdef ARMV7_ONLY

1.12 + <supports-screens android:smallScreens="false" />

(ref https://hg.mozilla.org/releases/mozilla-beta/rev/77455622c8ac)

....It made it impossible to use Firefox on ALL regular sized hand held smartphones in the ARM7 family? Hmmmm... Am I understanding this correctly? Or is there something unique about the Motorola implementation of the GPU that makes Android think the screen is different than others?