I'm using jessie/testing. iceweasel 24.2.0esr-1 gstreamer1.0-plugins-good 1.2.2.1 gstreamer1.0-libav 1.2.2.1 gstreamer0.10-plugins-good 0.10.31-3+nmu2 And I can't see h264 support from https://www.youtube.com/html5 What's wrong? Is Iceweasel using gstreamer1.0-libav ? as there no gstreamer0.10-ffmpeg anymore in the debian repository?