Hi, it depends on the site design. You can test on Total Wine glassware page (https://www.totalwine.com/accessories-more/accessories/glassware/c/001555). Use the Page Info dialog (Ctrl+i, Mac: Command+I) Media list to check the image formats. Reload after changing the "Strip image/webp" setting and check again. With the extension stripping webp, the original formats (PNG, JPEG) are used. If that doesn't work for you, check this article just in case: https://support.mozilla.org/kb/extensions-private-browsing

If there are specific sites you would like help with, you can try creating a new issue at https://github.com/jscher2000/dont-accept-webp/issues or emailing me at jscher2000@outlook.com.