Solution
Mozilla Firefox includes a feature which initiates a file scan after completing a download. When using previous versions of ESET, Firefox's scan trigger can cause delays when downloading larger files. In ESET Smart Security and ESET NOD32 Antivirus 4.2, your downloaded files will no longer be scanned twice. ESET recommends upgrading to version 4.2 or later of your ESET product. Existing customers with a valid license are eligible for a free upgrade to the latest version of the same product.