Ajax Modifier is a free Chrome add-on developed by ygyooo. This add-on allows users to modify Ajax responses on any webpage. It provides a convenient way to override the response data in the XMLHTTPRequest object as well as the fetch method.

To ensure a smooth browsing experience, it is recommended to turn off this extension when it is not in use. This can be done by simply toggling the extension icon, which will turn gray when deactivated. By doing so, you can prevent any unintended interference with normal page browsing.

It is important to note that Ajax Modifier only modifies the response results at the JS level. This means that it will only affect the global XMLHTTPRequest object and the fetch method's return values, ultimately impacting the page display. However, the original response as seen in Chrome's DevTools "Network" panel will remain unmodified.