I also reported this in the firefox bugtrack, but the marked it as duplicate of a bug created in 2000, so i don't think they care or it's already fixed in trunk.
The funny thing is that dropping a image to the desktop/explorer is creating a *.jpg.
YES! Thats exactly what I found 2 minutes before. If you drag & drop a jpg-picture from bild.de to your explorer, you get a JPG. But if you drag & drop the same jpg-picture to Mp3tag, it makes a image/bmp. Strange...
I just ask you:
How difficult would it be to implement a conversion from *.bmp to *.jpg inside Mp3tag? I have no idea if there are existing libraries for such a task.
And another thing:
With the file-explorer from windows the drag&drop from FF works. How can they make it work in file-explorer?
I don't know how drag'n'drop to Windows Explorer works internally in FF 3.5 but I've added a workaround for this issue with the current Development Build.