The text is too wide for the screen
I can't see the first and second letters on the left nor the last letter or two on the right nor the scroll arrow on the right. I've already gone into "view" and "zoom" and held down the CTRL KEY and the Minus Key without success.
Wšykne wótegrona (1)
It is possible that the screen is too wide or too high and that the scroll bars fall off.
Open the system menu via Alt+Space and see if you can resize that window.
If that works then close Firefox to save that setting.
See also:
Window sizes and positions are stored in localstore.rdf in the Profile Folder.
See: