1) In Firefox 15, the demo page adds two new options to my right click menu: Rotate clockwise and Rotate Counter-clockwise. Is Firefox recognizing pdf.js (since it appears that they are related) or pdf.js adding menu options? I didn't know JS could do that.
2) Isn't Javascript an embeddable language inside PDFs? I'm pretty sure I read that javascript is used, not necessarily for animations but for run-time dynamic layouts. If that's true, is pdf.js "eval"-ing that javascript?
I've seen custom contextmenus generated on pages[0] that override the built-in context menu but for some reason I've yet to come across a page[1] that adds to the existing context menu until today.
[0] replacing example: http://developer.yahoo.com/yui/examples/menu/tablecontextmen...
[1] appending example: https://bug617528.bugzilla.mozilla.org/attachment.cgi?id=554...
the reason is likely because browser compatibility for the context menu js api is pretty minimal [1]. firefox can use it on pages that are only going to be displayed in firefox, but for the internet at large it's pretty useless.