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)
可以出个修改后缀保存的功能嘛，有的网站不是标准图片格式，自己改后缀是可以正常显示的。
或者以网站标题为压缩包或者文件名