Created attachment 2864 HTML5 Drag and drop test page When testing new HTML5 features in Firefox 3.6, I discovered that Thunar Drag-n-drop did not worked as expected (from Thunar to Firefox 3.6). After many tests on other platform/OS (window XP, Ubuntu/Gnome, Mandriva/Gnome) and on my environment (Gentoo/Xfce), and since Using Endeavour2 works as expected (on Gentoo/Xfce), I conclude that this is a Thunar related bug. Simple test can be made in using attached HTML file, or on http://demos.hacks.mozilla.org/openweb/DnD/ in order to reproduce the problem. Technically speaking, when dropping file(s), the "event.dataTransfer.files" javascript array is empty, making impossible to get back javascript File object(s) to treat them. Hope it helps to get Xfce and Thunar better ;-)
I can confirm DnD does not work with Firefox 7, content is empty once it's been DnDed. On the attached page the count is '0', and on the Mozilla test page the content is empty too. While the action works, content is not there. I tried with Thunar, Eog and Gnome-screenshot, for none of them it works. However Chromium works fine, so I guess Firefox has some improvements to do.