Facilitate usage of an online PDF viewer for PDF documents

If a user encounters a PDF document on a public Web site, it would be useful if there was an option to view the PDF via an online viewer (one such viewer is at http://view.samurajdata.se/ on the Web, though there are likely others.) Specifically, if a URL indicates a PDF file (i.e. http://example.com/test.pdf?id=3) or the MIME type indicates a PDF file, the user could be prompted about whether to view the PDF in an online viewer instead of the warning about external applications unmasking Tor. Also, if the user right-clicks on a URL link that indicates a PDF file, the context menu could include an option along the lines of "View PDF in Online Viewer" to make things easier.