User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120130 Firefox/12.0a1 Build ID: 20120130031142 Steps to reproduce: Firefox 12 allows pasting URL directly in the download manager window to download it (see recent Bug 712421). In addition, drag-and-drop of element of a webpage (images, links etc) to the download manager window is allowed too. But drag-and-drop of URL from the location bar to the download manager window is still not allowed. So allow this action to be consistent with the other possibilities of downloading.
This works for me. How are you dragging the URL?
My steps: - I select the URL in the location bar (double click or Ctrl+A). - I do a long left click on the highlighted URL to drag it - I drop it into the download manager window BUT I found my error, I have been abused by another bug. In fact, if "http://" URL prefix is hidden (browser.urlbar.trimURLs = true, default value), drag & drop the URL from the location bar to the download manager doesn't work. If browser.urlbar.trimURLs = false, it works like you. But I fail to find the bug number, I'm pretty sure it's already filled.
Ah indeed, protocol stripping breaks this.
I believe this is fixed by bug 670587 on today's (Aug. 27th) nightly.
Yes, it's fixed. Now, HTTP files/webpages are downloaded when the user drops the URL in the Download Panel or the Download Library.
Marking as verified based on Loic's comment 5.