This should be fixable if you're using a normal PC screen. I can't see it myself because I don't see the ads, but almost any addon for any program can affect other programs too. In my case I had to disable three addons which I couldn't even think might have affected RHP, but they did, the site worked properly as soon as they were disabled. I brought them back one by one, to identify the one that was a problem, and when I found it I disabled it again. End of problem.
Your other option is to try using either Internet Explorer or Google Chrome, see what happens on either of those.
Afterthought: if you use the "insert smiley" on the posting page (it's below the typing box and Post button) you get proper little graphics. 🙁 rather than :-(