Wishlist button on game already in wishlist not working

[Tailszefox]

Version used: ES 7.3 Firefox version: 36.0.1 on Linux

How to reproduce:

• Go to the store page of a game in your wishlist. For my example, I'll take Grim Fandango : http://store.steampowered.com/app/316790 .
• However over the "On wishlist" button. It will say "Click to view your wishlist".
• Click the button. Instead of taking you to your wishlist, the button will revert back to "Add to wishlist", as if the game had been removed from it (though if you reload, it won't actually be removed).

I think this problem is pretty recent, I remember being able to access my wishlist like this not too long ago. I haven't seen any error in Firefox console.

[HYBRID-BEING]

Currently, with FF 40.0.3 and ES 7.3, works as normally on Steam for me. But that's strange, cause i remember it working as you described for a while and that was obviously a feature (since even icon on the button changed to ⊗). It made sense to have a "Remove from wishlist" button, though i guess nothing wrong with having Wishlist button duplicated there as well.