It seems very inconsistent, doesn't it? Based on reading other threads here, it depends on which generation ARM processor the device uses. The ones that have an ARMv6 instruction set can't run Firefox, while those with an ARMv7 chip can. Assuming your phone has a Snapdragon processor, then according to Wikipedia (!), it should support the ARM7 instruction set. But maybe someone with such a phone can confirm? If you edit your question to include the name of the phone perhaps more people would spot it.

Thanks jscher for your answer , I translate into English some more facts about the phone, hope you understand, I really hope this phone works with firefox  !!

Screen of 4.5 inch-type super-AMOLED plus with 800x480 pixel resolution. Android 2.3, TouchWiz interface. 1.5 gigahertz Snapdragon processor with dual cores. 16 gigabytes of internal memory and supports microSD cards (up to 32GB), WiFi 802.11 (a / b / g / n) and AllShare. Camera at eight megapixels to point-in flash and video for full HD (1080 pixels). Fast Write feature Swype. Dimensions 129.8 x 68.8 x 9.49 mm, weight 130.5 grams. Battery: 1850 mAh. Supports LTE 2600/1800/800 mhz, HSUPA, HSPA + and + 2100/900 up to 42 Mbps, EDGE / GPRS 1900/1800/900/850.

Yes, that processor is an ARMv7 processor, so it should be able to run Firefox. You can go to http://www.mozilla.org/en-US/mobile/, and try to install Firefox on the phone. Let us know how it goes!

I first wanted to know if the phone worked with firefox before I bought it but now that I know, I promise to update when I got home the phone and you can update the list of working phones. thank you for all your help with kind regards Jenny.

If you buy the phone in the store, you may be able to test it there without purchasing as well (on like a demo phone).

Hello,

It was not possible to test the phone somewhere

That's why I asked my question here.here.