Enable TouchScreen KeyBoard in FireFox

source: How to Display On-Screen Keyboard in Mozilla Firefox (trishtech.com)

Enabling this setting is useful for our Touchscreen enabled GraceLink CheckIn stations:

• First Go into the settings App in Windows. On Windows 10, Navigate to Devices, Typing.
• Enable "Show the touch keyboard when not in tablet mode and there's no keyboard attached" setting.
  
  
• Now Open Firefox
  
• enter in the address field about:config
• search for detect or  keyboard. You will need to change the ui.osk.detect_physical_keyboard config to false.
  
  
  
  
• Restart Firefox and the onscreen Keyboard should show up when you tap on a text field in FireFox.