1303341 - Weird green flashing block on "Burst" animated GIF, at Mozilla Open Design blog post

Status: NEW

(Core :: Graphics: ImageLib, defect, P3)

Description

[Daniel Holbert [:dholbert]]

Attachment: screencast of bug

I'm on my laptop on a train, tethered via a slow cell connection, and I noticed some weird graphical glitches while the graphics in this page were slowly loading:
  https://blog.mozilla.org/opendesign/progress-in-the-making/

Some of the animations loaded quickly, but the "Burst" one (a 1.5 MB animated GIF) took a while -- and while it was loading, it flashed a huge green block over its lower half over and over. See attached screencast.

I've only hit this once, so I'm not sure how reproducible it is (nor am I sure whether it's a regression).

This was in my normal browsing profile (with e10s disabled) on a lenovo laptop running 64-bit Ubuntu 16.04.

Comment 1

[Daniel Holbert [:dholbert]]

The GIF in question is hosted here:
 http://ffp4g1ylyit3jdyti1hqcvtb-wpengine.netdna-ssl.com/opendesign/files/2016/09/Burst_rotating.gif

When I hit the bug, I tried viewing the image in its own new tab, too. I did not see the flashing there -- the image was just static (because it was still downloading, I think).  When I switched back to the Open Design tab, the flashing was still happening there.

Comment 2

[Timothy Nikkel (:tnikkel)]

I slowed my network to 3G speeds t9his seemed pretty slow) using this http://nshipster.com/network-link-conditioner/ and I didn't see any problems with that gif on that page on my mac.