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Mozilla will only open in a small window which won't enlarge and disappears when clicked

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When the small window is clicked usually disappears but sometimes there is a shadow of a Page that slides off the screen to the right?

When the small window is clicked usually disappears but sometimes there is a shadow of a Page that slides off the screen to the right?

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You can check for problems caused by a corrupted localstore.rdf file.

You can try to open the system menu via Alt+Space and see if you can move the window into view and resize the window by using the keyboard.
Close and restart Firefox to see if you keep the setting.