I've been using FireFox for quite a while now, but suddenly something strange started happening: if I'm editing something on the browser (say, a post), and I do a "preview" I used to be able to press the back button and continue editing. Now, though, when I press the back button the form contents are wiped out. I can press "forward" though and the contents are re-posted, so they're still in there somewhere. Strange. I'm pretty sure I didn't change any settings on the browser. I wonder why this started happening...