Commit f8ad5442 authored by Fernando Fernandez Mancera's avatar Fernando Fernandez Mancera Committed by Georg Koppen
Browse files

Bug 22548: Firefox downgrades VP9 videos to VP8. 

On systems where H.264 is not available or no HWA, VP9 is preferred. But in Tor
Browser 7.0 all youtube videos are degraded to VP8.

This behaviour can be turned off by setting media.benchmark.vp9.threshold to 0.
All clients will get better experience and lower traffic, beause TBB doesn't
use "Use hardware acceleration when available".
parent 09f9addb

browser/app/profile/000-tor-browser.js

+2 −0
Original line number Diff line number Diff line
@@ -153,6 +153,8 @@ pref("javascript.use_us_english_locale", true); 
// pref("intl.charsetmenu.browser.cache", "UTF-8"); // Set by Torbutton

// Disable video statistics fingerprinting vector (bug 15757)

pref("media.video_stats.enabled", false);

// Set video VP9 to 0 for everyone (bug 22548)

pref("media.benchmark.vp9.threshold", 0);

// Disable device sensors as possible fingerprinting vector (bug 15758)

pref("device.sensors.enabled", false);

pref("dom.enable_resource_timing", false); // Bug 13024: To hell with this API

dom/media/Benchmark.cpp

+1 −1
Original line number Diff line number Diff line
@@ -89,7 +89,7 @@ VP9Benchmark::IsVP9DecodeFast() 


  uint32_t decodeFps = Preferences::GetUint(sBenchmarkFpsPref);

  uint32_t threshold =

    Preferences::GetUint("media.benchmark.vp9.threshold", 150);

    Preferences::GetUint("media.benchmark.vp9.threshold", 0U);



  return decodeFps >= threshold;

#endif