The problem is on Amazon website when using 1-click to purchase digital books. I keep getting "An error occurred when we tried to process your request. " (see attached pic) when I click on the 1-click button. After checking my settings in Amazon and Firefox and retrying several times and still get the same error. I switched to a different browser app (Adblock browser app) and had no issues with the purchase. So, I figured it's for to be something in Firefox's code.