I have this annoying problem with my wordpress admin when adding or editting a new post, it just keeps on refreshing!
After a few search, i’ve stumbled upon this post. It seems that the problem occurs when you have firebug or the gears plugin enabled. After disabling it, im still getting the same results so i’ve tried restarting Firefox instead and bingo! it works. From the looks of things, the problem occurs when you have a Firefox update pending so restarting your browser is the simple fix.