Just happened to me on the same version of Firefox (3.5.9+nobinonly-0ubuntu0.9.10.1), Ubuntu karmic, x86_64. Anything that can normally be dragged (bookmarks, tabs, etc.) can't be dragged anymore. After restarting Firefox, drag and drop works again.
Just happened to me on the same version of Firefox (3.5.9+ nobinonly- 0ubuntu0. 9.10.1) , Ubuntu karmic, x86_64. Anything that can normally be dragged (bookmarks, tabs, etc.) can't be dragged anymore. After restarting Firefox, drag and drop works again.