How can I detect the current tab's mime type in a Google Chrome extension?

Question

I want to see if the current tab is a PDF file from a background page.

I can check the url for .pdf at the end but there are some PDF files that don\'t have that.

Answer 1

A somewhat hackish way (I have no idea if it works always or just sometimes) is to look at the page content. There you will find an element for chrome's PDF viewer. It looks along these lines:

You can check that "type" attribute to see what you are dealing with.