After downloading 18.0.1, I have not been able to successfully add items to a cart or wishlist from Amazon in Firefox. When I try to add from a product page, I get an odd page that comes up with the title of the item and another button to "Add to Cart" or "Add to Wishlist" and when I click on this new button, the page just refreshes. If I check the cart/wishlist after this, the item is not added. If I attempt to move an item from one wishlist to another, I get a little error message that pops up underneath the item I am attempting to move that states: An error has occurred, please try again later. Then the page will refresh on its own. Amazon has told me to empty the cache but this stopped working a long time ago. I have Firefox empty the cache upon exit now and the problem persists. I have tried Safe Mode and the problem persists. I have Reset Firefox multiple times to no avail. My add-ons have been up to date during this process. If anyone has any suggestions, please let me know. I have had to resort to IE for one site and don't want to have to change browsers after having such a long history with Firefox. Thanks!