Firefox extends off the right side of the screen. Firefox inside/outside windows.
Debian 10 32bit Firefox 80.0.1(32bit) Xfce 4.12
If I click the "maximize" button, the right side of Firefox extends off the right side of the screen. A second later, the right side of Firefox is inside the screen limit. Next, I click the X to close Firefox. I click the Firefox launcher icon to start Firefox. The Firefox window appears and the right side of the window is inside the screen limit, a second later, the windows extends beyond the right screen limit. If I click the "restore down" button, the window appears within the right screen limit.
I click the "maximize" button and Firefox appears full screen and within the screen limits. I then click the X to close Firefox. I click the Firefox launcher icon to start Firefox. Firefox inside and outside windows appear. The button in the outside window do not work. If I click the "restore down" button on the inside window, the outside window disappears and only the inside windows remains on the screen.