Hi, Just wanted to let you know that I encountered the same error when trying to complete purchase transactions on eBay. After several frustrating days trying to resolve the problem with Paypal and eBay, I finally solved it by just going through all my settings in Firefox, eventually discovering by trial-and-error that two of my add-ons were the culprits. The two add-ons that I disabled were GHOSTERY 2.2.1 and TACO 3.0 WITH ABINE. Both of these add-ons supplement computer security by identifying and blocking hidden 3rd party web bugs (ad networks, behavioral data collectors and web analytics providers). TACO provides additional security and control of your personal information online. After disabling the add-ons and restarting Firefox, I was able to complete my transactions with no further problems. It does make me concerned though that Paypal and/or ebay may be employing hidden trackers or some other form of information collection outside of our knowledge which may pose potential security issues. Hope this helps!
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