Description of problem:
Since one of the last updates for fedora 22 firefox crashes when trying to playback videos on youtube. When running firefox from a terminal the following lines are last ones before firefox crashes:
DtsGetHWFeatures: Create File Failed
DtsGetHWFeatures: Create File Failed
Running DIL (3.22.0) Version
DtsDeviceOpen: Opening HW in mode 0
DtsDeviceOpen: Create File Failed
libva info: VA-API version 0.37.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.37.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.37.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
libva info: VA-API version 0.37.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib64/dri/i965_drv_video.so
libva info: va_openDriver() returns -1

Version-Release number of selected component (if applicable):
$ rpm -q firefox
firefox-38.0-1.fc22.x86_64 (installed from koji but also happens with 37.0.2)

How reproducible:
allways

Steps to Reproduce:
1. Start firefox
2. Navigate to youtube
3. Open i.e. https://www.youtube.com/watch?v=oYjfa5SktXA

Actual results:
Firefox crashes

Expected results:
Firefox should play the video without crashing

Additional info: