This extension will not work without a Footietracker account. When you click the update button in the Footietracker browser extension, your spreadsheet will be updated with your Football Index portfolio data. This data consists of the players in your portfolio, their purchase dates, their quantities, etc. Our browser extension is open-source which means its code is publicly available and can be checked by other people. We also include instructions on how to build the extension from the source-code. At no point will any credentials be sent to our servers. The Github repository can be found here: https://github.com/samjmckenzie/footietracker-extension.