Configuring Plugins for Video Streaming in Firefox

In the beginning I had to configure a plugin to get any video from sources like Youtube playing. I’ve done that and it works for about 2/3rds of the videos. But some still don’t work, and I don’t get more infos or warnings or error messages for it. I likely didn’t do more than install the plugin recommended by firefox after the initial installation.

This one works: Jackie Chan - How to Do Action Comedy - YouTube
This one doesn’t work: Illustrator on the iPad - Editing Pencil Tool Paths - YouTube
Vimeo also doesn’t work completely. Amazon Prime Video works completely.

Could someone give me a hint on what I could try to figure this one out?

Do you have this enabled in Firefox settings?

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It’s activated, yep.

I don’t need any special plugins to watch that video.

I wonder if it is the opposite, have you installed a plugin/setting that is blocking them?

Are you using arkenfox or some other custom user.js?

I am not sure what a “customer user.js” is.

I am doing some modifications to the loading pages though, since I’m using uBlock origin to block ads. Could this block the whole video from playing? I haven’t seen that happen in other systems, though (not Fedora, but including RHEL desktop, Windows, OSX, Ubuntu). So it would surprise me if that is it.

It is certainly possible to configure it in a way that would block the video but it wouldn’t do that by default. I am also using ublock origin.

I would try disabling your add-ons and seeing if the video plays. If it does, enable them one at a time. If it doesn’t, you know it is something else.

Didn’t work. And besides ublock Origin I just had something called “Widevine Content Description […]” which I have no clue what it does. I think that is what autoinstalled the first time.

When I deactivate ublock I get the ad playing but not the actual video. Dang. So that probably wasn’t it.

Also for me it works.
Maybe, did you install the Multi media group?
dnf groupinstall "Multimedia"

Not sure if it is called the same on your system.
So you’ll need to look for it, maybe by
dnf group list --hidden

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You don’t want to disable that. That is what lets widevine DRM content play.

Okay. I have reactivated Widevine as suggested by @dalto and I’ve checked that “Multimedia” group is installed (same name) which I could verify with dnf group list --hidden as suggested by @huben.

Same result.

Strange, what you also could try is a different browser, like google chrome.
For this one you would have to enable its repo in advance.

Great idea. I tried Chromium and there the videos work.

So the next step might be figuring out what’s different between these browsers under the hood when they play videos.

The Youtube Support team had some futher things to check.

As a first step I tried logout → login. No success yet. Replay ID after: xcOQrjBHReXhMSyg

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Updating to current Firefox solved the problem completely, it seems. :star_struck:

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