This trick may or may not work, but I have found that if I hit submit prematurely, sometimes by hitting the back-arrow a few times I can go back and find my text in the box on a previous Mudcat page. It might be worth a try.

My other trick, if I am typing a long post, is to copy it as I go and paste it into a text box, e.g. Notepad, or even an email and save it as a Draft copy. I save it a few times as I go until I am ready to hit the submit button.