$ MOZ_LOG="nsDragService:5" firefox-developer-edition
...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::StartDragSession
[Parent 19225: Main Thread]: D/nsDragService nsDragService::GetNumDropItems
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0x81
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService 1 items
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService good! ( it's text/uri-list and                    we're checking against text/x-moz-url )
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against application/x-moz-custom-clipdata
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService good! ( it's text/uri-list and                    we're checking against text/x-moz-url )
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking STRING against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against application/x-moz-file
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported text/html
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/html
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/html
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/html
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/html
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/html
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/html
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/html
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/html
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/html
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/html
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/html
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against text/html
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService good! ( it's text/uri-list and                    we're checking against text/x-moz-url )
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against text/x-moz-url
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against text/x-moz-url-data
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/unicode
[Parent 19225: Main Thread]: D/nsDragService good! ( it's text plain and we're checking                    against text/unicode or application/x-moz-file)
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking STRING against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against text/unicode
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against text/unicode
[Parent 19225: Main Thread]: D/nsDragService nsDragService::IsDataFlavorSupported image/png
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against image/png
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against image/png
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against image/png
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against image/png
[Parent 19225: Main Thread]: D/nsDragService checking STRING against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against image/png
[Parent 19225: Main Thread]: D/nsDragService checking x-special/gnome-icon-list against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/uri-list against image/png
[Parent 19225: Main Thread]: D/nsDragService checking UTF8_STRING against image/png
[Parent 19225: Main Thread]: D/nsDragService checking COMPOUND_TEXT against image/png
[Parent 19225: Main Thread]: D/nsDragService checking TEXT against image/png
[Parent 19225: Main Thread]: D/nsDragService checking STRING against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/plain;charset=utf-8 against image/png
[Parent 19225: Main Thread]: D/nsDragService checking text/plain against image/png
[Parent 19225: Main Thread]: D/nsDragService checking DELETE against image/png
[Parent 19225: Main Thread]: D/nsDragService nsDragService::GetData 0
[Parent 19225: Main Thread]: D/nsDragService looking for data in type application/x-moz-file, gdk flavor 0xb2
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0xb2
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService Failed to get data.  selection data len was 0
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService dataFound = false
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0x84
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService nsDragService::GetData 0
[Parent 19225: Main Thread]: D/nsDragService looking for data in type text/x-moz-url, gdk flavor 0xb3
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0xb3
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService Failed to get data.  selection data len was 0
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService dataFound = false
[Parent 19225: Main Thread]: D/nsDragService we were looking for text/x-moz-url...                       trying again with text/uri-list
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0x81
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService Got text/uri-list data
[Parent 19225: Main Thread]: D/nsDragService successfully converted                                _NETSCAPE_URL to unicode.
[Parent 19225: Main Thread]: D/nsDragService dataFound and converted!
[Parent 19225: Main Thread]: D/nsDragService nsDragService::GetData 0
[Parent 19225: Main Thread]: D/nsDragService looking for data in type text/unicode, gdk flavor 0xb4
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0xb4
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService Failed to get data.  selection data len was 0
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService dataFound = false
[Parent 19225: Main Thread]: D/nsDragService we were looking for text/unicode...                        trying with text/plain;charset=utf-8
[Parent 19225: Main Thread]: D/nsDragService getting data flavor 0x85
[Parent 19225: Main Thread]: D/nsDragService mLastWidget is 0x7f6c1e1520d0 and mLastContext is 0x7f6bef88ce40
[Parent 19225: Main Thread]: D/nsDragService about to start inner iteration.
[Parent 19225: Main Thread]: D/nsDragService doing iteration...
[Parent 19225: Main Thread]: D/nsDragService nsDragService::TargetDataReceived
[Parent 19225: Main Thread]: D/nsDragService finished inner iteration
[Parent 19225: Main Thread]: D/nsDragService Got textplain data
[Parent 19225: Main Thread]: D/nsDragService successfully converted plain text                                to unicode.
[Parent 19225: Main Thread]: D/nsDragService dataFound and converted!
[Parent 19225: Main Thread]: D/nsDragService nsDragService::SetCanDrop 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::StartDragSession
[Parent 19225: Main Thread]: D/nsDragService nsDragService::SetCanDrop 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::ReplyToDragMotion 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::StartDragSession
[Parent 19225: Main Thread]: D/nsDragService nsDragService::SetCanDrop 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::ReplyToDragMotion 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::StartDragSession
[Parent 19225: Main Thread]: D/nsDragService nsDragService::SetCanDrop 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::ReplyToDragMotion 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::StartDragSession
[Parent 19225: Main Thread]: D/nsDragService nsDragService::SetCanDrop 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService::ReplyToDragMotion 1
[Parent 19225: Main Thread]: D/nsDragService nsDragService: dispatch drag leave (0x7f6c0acec000)
[Parent 19225: Main Thread]: D/nsDragService nsDragService::EndDragSession 0