BSW. Bonusmelder is a browser add-on designed for Firefox users, aimed at enhancing online shopping experiences. This subscription-based tool helps users save money by highlighting discounts available from BSW's online partners during web searches. Once installed, the add-on displays an icon in the browser's upper right corner, which activates when users search on Google or Bing, marking results that offer savings opportunities.

As users navigate partner websites, the BSW icon becomes animated, providing real-time updates on available discounts. To secure these savings, users can click on the advantage tab, log in, and continue shopping to receive their benefits. Additional functionalities include searching for partners, toggling the add-on on and off, and accessing a comprehensive list of BSW partners, making it a valuable tool for savvy shoppers.