I'm running Windows 10 on a Surface Pro like device (it's a Vaio Canvas). I have a bluetooth keyboard that is always connected, but I often just use it as a tablet. I've tried disconnecting the physical keyboard but I still get the same behaviour. Using touchscreen, I select a text box (or URL bar/search box etc), normally the On-screen Keybard (OSK) comes up and lets me type. Right now, with FF it pops up and then promptly disappears. This makes FF completely unusable using touchscreen/tablet mode. I have switched to using chrome on this device - I've tested other browsers too and none exhibit this behaviour. Could it be my settings?