User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20170828100127 Steps to reproduce: Load up a fine animated GIF like https://masterofallscience.com/video/S01E04/pCMx9J2heTSqJfuxZl9UXl20I0s=.gif Drag it into an iMessage chat window and send it Actual results: It sends a static image, the first frame of the GIF Expected results: It should animate. Using Google Chrome drag/drop works (it animates), but copy/paste doesn't (static image, same as firefox). In Safari, both drag/drop and copy paste work (animation preserved). This feels like a small thing but I'm sure there are other areas where Firefox drag/drop isn't behaving fully "natively" that this might be a good test-case for. Also, this is like 90% of my need for a browser—to find good GIFs and send them at people.
status-firefox55: --- → affected
status-firefox56: --- → affected
status-firefox57: --- → affected
Priority: -- → P3
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