Why does Firefox never open in a Maximised window?

I have just updated from v3x to v8. My old version would NEVER open in a maximised window, it was ALWAYS just slightly smaller than the full screen.
Now, v8 is doing exactly the same thing.
THIS DRIVES ME INSANE!

Yes. But using the mouse won't actually maximise the window, if you mean dragging the edge of the window to the edge of the screen. If I do this with the mouse I can still see the blue border round the FF window. If I use the max button the blue border goes and I get a true maximised window filling the screen.
I clicked on the max button and when I closed FF I used the File, Exit command.
It still opens in something less than a full screen.
I've just tried it all again and it still insists it knows best.
Many thanks for the help,
Regards, Brian

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