The post http://forums.mozillazine.org/viewtopic.php?p=14989107#p14989107 may have related Bugs for Youtube issues in very recent builds of Firefox Nightly.

Please read https://bugzilla.mozilla.org/page.cgi?id=etiquette.html before considering commenting in the Bugs.

The more unstable Nightly development channel meant for devs and testers in mind gets checkins and updates twice a day so you are bound to encounter issues until it is fixed, finished or reverted.

The post http://forums.mozillazine.org/viewtopic.php?p=14989107#p14989107 may have related Bugs for Youtube issues in very recent builds of Firefox Nightly. Please read https://bugzilla.mozilla.org/page.cgi?id=etiquette.html before considering commenting in the Bugs. The more unstable Nightly development channel meant for devs and testers in mind gets checkins and updates twice a day so you are bound to encounter issues until it is fixed, finished or reverted.

I tested it not only on youtube now and problem with all video players on any site, exept real time video streams like twitch.

Also please understand what i don't have so much time to read every post on every site where firefox community is chatting and honestly i won't spend 100h to "read before commenting in the bugs". It's not my job.

if developers won't (or can't) fix problem what i describe here (it's allready MY participating to improve product) i'll just switch browser.

Not valid answer. Problem not described on forum and also it's not only youtube problem. Every video player not working

Try to flip the value of media.ffvpx-hw.enabled in about:config, then reload the tab.

What OS?

What OS?

Windows 10, pro

Try to flip the value of media.ffvpx-hw.enabled in about:config, then reload the tab.

Yes. That worked. it was true and now false. Can you please describe why it helped and why something could enabled/disabled it?

Sure, but I thought you didn't want to spend 100hs reading.

Your bug has been introduced by this new code, so disabling it should help. This is Nightly, so sometimes things can break.

Sure, but I thought you didn't want to spend 100hs reading. Your bug has been introduced by this new code, so disabling it should help. This is Nightly, so sometimes things can break.

And now, with your kind help, I won't have to spend 100h to solve problem. Isn't that great? Or do you want N number of people spending M hours to find the answer to Z problem, rather than asking on a forum from knowledgeable people who are already in the field? Isn't that what the forum is for? I thought sadism was dead.

Thanks for info.

Nightly development channel builds have been meant more for Testers and Devs in mind as things are a work in progress, especially when a new version is started on the Nightly channel and they rush in checkins and updates twice a day.

You will probably find more Nightly testers and information in the daily threads in http://forums.mozillazine.org/viewforum.php?f=23 as most users here on support.mozilla.org tend to post things about Release and Beta channel builds.