I am trying to set up both firefox and thunderbird on a new very small (12 inch screen) for travel and with a windows custom magnification of 110 for disabilities. The finish set up screen in firefox and the give thunderbird access to your google accounts screen in thunderbird do not appear to be showing the whole screen with no way to get to the bottom to click the critical allow or continue buttons. Those buttons appear to not exist. I am having the same problem trying to sign out of machines replaced several years ago - I can click which ones I want to sign out but it brings up a screen asking why with no continue button so I am stuck. Help!