I have a MS Surface. when I have the external keyboard connected it works fine. When I disconnect the keyboard, the virtual keyboard pops up and then disappears. The virtual keyboard works fine on chrome, edge and all other applications. I have "refreshed" firefox, uninstalled and reinstalled firefox with the latest versionand and tried safe mode. If i somehow, not sure how, I get firefox on only 1/2 of my screen, the keyboard works. I have another surface and firefox works fine there. Any help would be appreciated.