Tesco Groceries TPNB Viewer is a Chrome add-on developed by reece.casey. This free tool is designed to provide a lightbox viewer with EANs (European Article Numbers) for TPNBs (Tesco Product Number Base) on the Tesco Groceries website.

With this add-on, users can easily view TPNB overlays and lightbox on the Tesco Groceries website. It is important to note that this app is unofficial and not maintained by Tesco.

Please be aware that the support for the old Tesco Groceries website has been deprecated, and this tool is specifically designed for the new Tesco Groceries website. Due to the new website being a single page application, the functionality of this tool is slightly different. Users will need to click on "View TPNBs" to access the TPNB overlays and lightbox.