User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 Build ID: 20140831201947 Steps to reproduce: Browse to some image, such as a JPEG image, where the http headers have Content-Disposition: attachment. For example https://farm6.staticflickr.com/5547/14629555742_73c1be962d_o_d.jpg Actual results: Firefox pops up a download dialogue box, which is fine. The options offered are - view with (image viewer program) - save to disk Expected results: There should be a third option - open in new tab So, even though the headers give Content-Disposition: attachment, the user should be able to choose to view the image directly in Firefox rather than in an external image viewer program.

Why in new tab ? The option I expect is : - Open in current tab