Hi Looking at the version of Android on your tablet, I think I can help with this. # Open the Android '''Settings''' app (typically a cogwheel) # Look for '''Applications''' or '''Apps''' # Select some of the ones that you use very often, open them and select '''Clear Cache''' (''do not'' select Clear Data!) # Consider clearing out apps that you do not need or use. Long press on them in the application drawer and drag them to uninstall at the top of the screen. Now restart your device and try Firefox Preview again. You should find that it runs a little better (and your device may be a little faster for everything).