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Firefox can't stay in full screen after 35.0 update

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After updating to FF 35.0, the full screen won't stay! It used to stay in full screen no matter what, unless I change it, but now, every time after I go to desktop, it will revert back to maximised window. Help please?

After updating to FF 35.0, the full screen won't stay! It used to stay in full screen no matter what, unless I change it, but now, every time after I go to desktop, it will revert back to maximised window. Help please?

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Such issues are usually a problem with hardware acceleration.