When I try to post a message, Firefox is asking me if I want to stay on page or leave the page.
If I choose leave, it actually doesn't have me leave the page. However, I get a message from the forum:
The following errors occurred with your submission
This forum requires that you wait 30 seconds between posts. Please try again in 21 seconds.
The post does go through despite the weird behavior although obviously it's possible to end up with duplicate messages by some unknowing soul.