User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150630154324 Steps to reproduce: I drag and drop a JPG image (I haven't tried with other formats) to another program such as Photoshop, Skype -to show a photo to a contact-, TagScanner -to add the cover of an album- or Web WhatsApp in another browser -to send a photo-. Actual results: The image is converted to BMP instead of preserving its format, breaking functionality in other programs (can't send the picture through Skype, can't send photo in Web WhatsApp) or simply creating a larger BMP file. Expected results: The image is supposed to preserve the original JPG format.

This is making me confused about the component, (as the drag starts from firefox and ends on another application) Richard, can you provide a link of image that you dragged on another application and seen format changing ? Beside, did you try doing that with other browsers ? and in Firefox Safe mode ? If safe mode is something new to you: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

>>> My Info: Win7_64, Nightly 46, 32bit, ID 20160208030244 I confirm comment 0: when I open any PNG image by direct link, then drag-n-drop the image to Skype conversation, the attached file is BMP. I believe the reporter about the other applications. This is quite long-standing, I'm glad somebody reported this. On the other side, at least drag-n-drop works, and I'm not sure it should (can) work in another way. This functionality isn't presented on Chrome... So I guess we should "appreciate what we have"? Still a feature should be consistent. Also, it doesn't work in e10s mode at all. The right component is probably "Shell integration".

Oh, comment 0 only mentions JPG images. Well, this bug applies to (at least) PNG, JPG and GIF images