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I can;t get firefox to open in full screen mode

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Since last update to Quantum I can't find a way to have the program open in full screen mode. I've tried everything I can think of and have found no answers online. Its a real pain. Can you help?

Since last update to Quantum I can't find a way to have the program open in full screen mode. I've tried everything I can think of and have found no answers online. Its a real pain. Can you help?

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I don't think that is possible because Firefox doesn't store the full screen state in xulstore.json ("sizemode":"normal|maximized").