Greasy Fork is available in English.
Images can be extracted and batch downloaded from most websites. Especially for websites the right click fails or image can not save. Extra features: zip download / auto-enlarge image. See the script description at info page (suitable for chrome/firefox+tampermonkey)
< Feedback on Image Downloader
一般是跨域导致的问题，可能挺难解决的。最好是可以发下网页地址，这样才可以确定具体的问题。
有些webp图片在 执行GM_xmlhttpRequest 这个函数的时候返回的是404
看不懂为啥？