Amazonセールフィルター is a free Chrome add-on developed by jojonki. It provides a filter feature that allows users to display only discounted and sale items on Amazon's search page. By clicking on the filter toggle button located to the right of the Amazon search bar or pressing the Ctrl+Shift+S key combination, users can easily switch between displaying all items and displaying only the discounted and sale items. The shortcut key can be customized according to personal preference through the chrome://extensions/shortcuts page.

Users can also customize the types of items to be displayed when using the filter. By clicking on the extension icon and selecting "Options," users can access the option screen where they can set their preferences. This option screen will automatically open upon installation.

Additionally, there is a feature that allows users to embed the developer's associate tag in the Amazon links to assist with development costs. Enabling this feature does not affect the functionality of the add-on, so users who wish to support the developer can turn it on and use the add-on.