1237354 - Firefox 43.x: Image drag & drop from Firefox to Windows Explorer doesn't work on certain sites

Status: RESOLVED DUPLICATE of bug 1231429

(Core :: DOM: Copy & Paste and Drag & Drop, defect)

Description

[bugzilla]

Attachment: attachment.png

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0
Build ID: 20151223140742

Steps to reproduce:

Trying to drag & drop an image from a website into Windows Explorer (Win8.1 x64).

Eg. go to https://twitter.com/RTPInstitute/status/667737753925386240 and try dragging and dropping the image into Windows Explorer (doesn't matter if embedded small image or left-click on image for full-size display). 


Actual results:

The result is a warning popup with the message "Error moving file or folder - unspecified error" (see attachment), and no image dropped into Windows Explorer.

This has been an issue since v43.0, it still worked in v42.

Twitter is just an example, dragging and dropping from eg. images.google.com often doesn't work as well. It's just that on Twitter.com (and tweetdeck.twitter.com) it's reproducible, image drag & drop fails 100% of the time.


Expected results:

The image should have been dropped into Windows Explorer, onto my local hard disk.

Drag & drop only works when opening the image in a separate tab, and even then it's not 100% reliable. Right-click > "save image as..." always works.

This issue does not happen in Chromium, Vivaldi, or Internet Explorer. In these browsers drag & drop works as expected.