## Todo list
* Browser: use javascript popup youdao translate instead sdcv solution.
* Browser: implement js plugin like vimium
* Browser: study more code from https://github.com/LavaPower/Browthon-Old/blob/c25d5721b40e95131a3c521566a18467f13ecbf0/files/Browthon_elements.py
* ImageViewer: add zoom support
* PdfViewer: allow select text.
* PdfViewer: use self.document.getToC() fetch and render bookmark.
* Support HiDPI? I haven't HiDPI screen.
* Aria2 client is awesome, welcome to PR.
* Markdown Previewer, add margin around preview page.
* Maybe xterm.js running in browser is cool. ;)
* RSS Reader: use python feedparser or JavaScript library implement reader like Google Reader.
* Better error prompt if something goes wrong, maybe in the `*eaf*` buffer
* Make PDF-Viewer works with Org-Mode, like https://github.com/luhuaei/interleave/tree/add-eaf does.