Hahaha, I'm on Chrome too! Sorry I didn't spit out all the details but I think that's everything now... It was working fine leading up to this sale but yeah, I'm at a loss. My wishlist is quite large though simply because if there's any new DLC or games that may interest me I just throw them on there for sale purposes so I don't have to go through the entire Steam catalog again.
Strange, I loaded up my wishlist within Chrome prior to posting and it's all there:
I also loaded up my wishlist within Firefox once more and again the buttons failed to show.