User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5 When trying to bookmark a url by dragging it from location bar to a place in bookmark toolbar (anywhere, includes bookmark folders), the url cannot be dropped and no bookmark created. Reproducible: Always Steps to Reproduce: 1. Enter a url into address bar, e.g: http://bugzilla.mozilla.org 2. Using mouse to highlight & drag it to the bookmark toolbar. 3. Try to find a drop footprint to drop the url. Actual Results: No drop footprint. Cannot drop the url to any place in the bookmark toolbar. No bookmark created. Expected Results: Firefox should show drop footprint and drop the url will bookmark it. I don't know if some of my extensions cause this problem. Here are my extension list: 1. Adblock Plus 2. Delicious Bookmarks 3. DownloadHelper 4. Firebug 5. IE Tab 6. Mouse Gesture Redox 7. StumbleUpon 8. Weave 9. Web Developer Note: This only happens in Firefox 3.5. It worked with Firefox 3.0.