Not the worst idea I've ever heard. I'll give it some thought. Absolutely no snark intended in the meantime but have you ever considered the back button? right-click/back, backspace key, and the actual back button in the browser GUI should all take you back to the unread page without reloading it. These should all work in all modern browsers. It won't remove the thread you just read, but if you're just going down the list it's a decent option.