I have downloaded all the beta and stable versions of Firefox even the new 21 beta, but all of these are buggy and slow with ace plus..Each time I select a text box for editing,the entire screen becomes blank,after clicking the back button for exiting keyboard,the application stuck and I need to restart my phone..Also sometimes the ui will become split after clicking a text box and when rotating my phone to landscape view..My handset is Samsung Galaxy Ace Plus GT S7500..please fix the bugs..