If you select the "log me in automatically" option when you log in, it should keep you from losing a post. I've never lost a post even the (few) times it's taken me a while to compose it. And don't "log out" unless you are worried about someone accessing your computer to use your account.
That said, a browser is a terrible place to write text anyway. I'd suggest writing big posts in a text editor, then copying them in.
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