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Firefox only fills half the screen at startup.

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Firefox only fills half the screen at startup after latest update. it is on the left side of the screen?

Firefox only fills half the screen at startup after latest update. it is on the left side of the screen?

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open up firefox and if it goes back to the previous positions, do it again and this time press and hold the ctrl key and close the window and reopen it should be back to the saved positions