Hi Mralva: You didn't give us enough information to help you. I have no problem with Firefox for Android 35 on my Galaxy S5 running Android 4.4.2, I just installed the snake web app using Marketplace as follows: ''Tools | Apps | Browse the Firefox Marketplace | Tapped on Garbochess | Tap Free | Tapped on Install | Tapped on Open and the chess app opened and i played chess! '' # '''What version of Firefox are you using on which tablet or phone and what version of Android OS''' (2.3 Gingerbread, 4.4 Jellybean etc) ? # '''What steps did you follow, what happened, what did you expect to happen'''?