hi "FALLEN RIDER'S FOUNDATION" do you have an actual firefox for android problem :-) ? finding your model number is not firefox but is an android question you can find your model number as follows (at least the following works on my s5 running Android Jelly Bean 4.4.2 ) # Open Android Settings # Tap on "About device" And then you will see: "Model Number" '''My S5 is: SM-G900M''' and if you do have a firefox for android problem please let us know * what you did * what you expected * what happened * what android operating system version and firefox version you are using