Take back what you said before.I have a try ,Web clipper can't work well on some sites which be judged unsafe by FF 52.0+ .But ,how to deal it,I have no way.Please fix it to compatible FF56.
Eg.
it does not work well on http://tech.sina.com.cn/t/2017-11-08/doc-ifynnnsc9476921.shtml
and it works on other sites.