下载pdf论文并自动用文章标题重命名文件，点击左上角的save按钮或按 Ctrl+S 触发下载（按键下载有bug暂不可用）。Automatially download a pdf paper and rename it with the paper title. This script works on opened pdf pages, e.g. arxiv.org/pdf/xxx.pdf. Click save button on the top left corner or press Ctrl+S to trigger. Currently support pdf pages in arxiv.org, aclweb.org/anthology/, proceedings.mlr.press，openaccess.thecvf.com, openreview.net, and ieeexplore.ieee.org.
增加对sciencedirect的支持。