gmail page covers screen - no way to scroll it smaller - El Capitan 10.11-6
OS El Capitan 10.11.6
Suddenly when I open gmail, the mail page opens and obscures the entire screen. There is no way to drag it to a different size. Even the top of the page is gone (address line, most visited, back or forward arrow to change to browser page (Firefox, extended support Release 78.11.0ESR (64 bit) No command to exit gmail either.
I have to use Force Quit to get rid of the page and then open the browser