Youtube only show videos in 360p quality in Firefox Developer Edition

Question

I've been having this issue with Firefox Developer Edition (FDE) on Youtube, where it show videos only in 360p quality, there's also an "Auto" option, which is also, the 360p quality. I'm in Ubuntu 14.04 LTS.

Here's an example of a video that I know is in higher quality because I can see it with Chromium and with youtube-dl.

On FDE:

On Chromium and youtube-dl:

What could be the cause of this?

I have installed the Adobe flash plugin and I keep all my packages up to date, including my version of FDE (40.0a2, updated 18th may 2015).

I want you to know that "switching from FDE to Chromium" is not the solution to this question and I will not mark those posts as the answer.

I tried deleting every Youtube and Google account related cookies but it didn't solve the issue.

Solution 1

Try installing this add-on onto your Firefox.

Solution 2

Go to about:config in Firefox and set the following properties to true:

• media.mediasource.enabled
• media.fragmented-mp4.exposed
• media.fragmented-mp4.ffmpeg.enabled

To check if it worked you can go to https://www.youtube.com/html5. You should see something like this:

Comments

[user3169]

Any change if you disable the Flash plug-in in Firefox?

[favourites]

Since I installed it I've been able to watch videos in better quality on Firefox Developer Edition, thank you.

[Stefan Falk]

Very painless solution ^^

[Sameera Kumarasingha]

very best solution