Specifically, certain functions on sellercentral.amazon.com. Firefox behaves as if nothing is happening after pressing a button. Menus work, however a large amount of functions do not work. I run on Arch Linux. I have my ad-blocker disabled for testing. I can use a different laptop running arch perfectly on this site. I have freshly updated both computers. The problem started around the time I installed the java version of Eclipse. I have tried several versions of Firefox with no improvement.