## Todo list
* 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: open link like vimium.
* PdfViewer: use mupdf/page.searchFor implement search text in pdf.
* PdfViewer: split window first, then scroll event cause view blank
* PdfViewer: allow select text.
* PdfViewer: use self.document.getToC() fetch and render bookmark.
* Support HiDPI? I haven't HiDPI screen.
* Make EAF support bookmark.
* Aria2 client is awesome, welcome to PR.