Twitter video playback issue in both normal view and in full screen view

[AndiAJ]

Steps to reproduce

1. Navigate to a twitter.com
2. Check the featured videos that start to auto play

Expected behavior

Videos play properly in both normal view as well as in full screen view

Actual behavior

Video playback starts (based on the progress bar) but no animation is displayed (white screen presented in normal view and black screen in full screen mode)

Device information

• Fire TV device: 4k pendant
• Latest affected Firefox version: 4.3-LAT2
• Earliest affected Firefox version: Firefox version: 4.3-LAT2
• Turbo Mode: ON

Notes

[athomasmoz]

Is this reproducible with turbo mode off?