Hey Alberto, Try Firefox Troubleshoot Mode to see if the problem goes away. Firefox Troubleshoot Mode (previously known as Firefox Safe Mode) is a special diagnostic mode that temporarily turns off hardware acceleration, disables add-ons (extensions and themes) and resets some settings. See the Diagnose Firefox issues using Troubleshoot Mode article for details.

If Firefox is open, you can restart in Firefox Troubleshoot Mode from the Help menu:

• Click the menu button , click Help, select Troubleshoot Mode and click Restart in the "Restart Firefox in Troubleshoot Mode?" dialog that opens.

If Firefox is not running, you can start Firefox in Troubleshoot Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Troubleshoot Mode window appears, select "Open".

If the issue is not present in Firefox Troubleshoot Mode, your problem is probably caused by an extension, theme or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Troubleshoot Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again. (If you can't exit Firefox Troubleshoot Mode, please see Firefox is stuck in Troubleshoot Mode).

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Also, try downloading a separate copy of Firefox and run it from the folder(do not sign into you Firefox account) to see what happens.

https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

I will Test your advices and I will come back later with the results. Until now I could get another log message from terminal when I use: 'firefox & ' command to run on the background:

1. 1. 1. !!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost

Thanks,

I will check your advices.

I checked the bug reports. Looks like the issue is related to Widevine. Could you try and disable the plugin and check whether the issue persists?

I run the Firefox on Safe mode on my Linux SO OpenSuse and the problem still there. I know that the problem will come when the Youtube video stops running and from there just need open more tabs or websites and them my Firefox frozens. Sometimes also frozen without Youtube video.

From my last try with Safe Mode I got this message from my terminal:

[Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c04f76c00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c04f76c00 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0842d800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0842d800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf8a69000 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf8a69000 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0316d000 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0316d000 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c031bc800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c031bc800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0842a000 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0842a000 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf3e0c000 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf3e0c000 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b50400 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b50400 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b81c00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b81c00 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b8c800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b8c800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf3e0f800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf3e0f800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf8a60400 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf8a60400 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0127f800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c0127f800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c01d18800 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c01d18800 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b89c00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5bf4b89c00 Decode error: NS_ERROR_DOM_MEDIA_DEMUXER_ERR (0x806e000c) - virtual RefPtr<mozilla::MozPromise<mozilla::MediaResult, mozilla::MediaResult, true> > mozilla::MP4Demuxer::Init(): No MP4 audio () or video () tracks: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:3541 [Child 26833, MediaDecoderStateMachine #1] WARNING: Decoder=7f5c02e67c00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /home/abuild/rpmbuild/BUILD/firefox-93.0/dom/media/MediaDecoderStateMachine.cpp:366 </p>

I'm testing now the Widevine plugin.

I am watching this. In my case of slowness or stalling, moving my large amount of bookmarks to subfolders helped somewhat. I still had problems, but not as frequently. Just like having too many files in a single folder can drastically slow down a computer, having too many bookmarks in the initial folder may do the same. I have thousands upon thousands of bookmarks.

I will take note of this @rjt69.

For now I will just format my OpenSuse with a new installation.

Until now the problem persists even with Safe Mode, I didn't try to install it by the tar.gz that @ jonzn4SUSE said. But if after the Opensuse Reinstallation didn't end this I will try the tar.gz install.

I checked the bug reports. Looks like the issue is related to Widevine. Could you try and disable the plugin and check whether the issue persists?

The Widevine stopped the problem with Firefox frozen at all, but didn't stopped the problem with youtube or any other sites that use media videos, the keep loading eternally without playing the video.

Make sure you have the latest FFmpeg and libavcodec packages installed.

You can toggle DRM off/on to make Firefox (re)load DRM components.

• Settings -> General: Play DRM
• https://support.mozilla.org/en-US/kb/enable-drm

You should see a XHR request in the Browser Console.

• https://developer.mozilla.org/en-US/docs/Tools/Browser_Console

If you want to dig for the issue try strace. see screenshots

I only use the distro version of Firefox as a backup(bookmarks and tabs) to Nightly(my daily driver). I also run a separate copy, but same or close to the version from the distro to test. see screenshot of versions currently running from folders the Download directory.

Make sure you have the latest FFmpeg and libavcodec packages installed. You can toggle DRM off/on to make Firefox (re)load DRM components.

• Settings -> General: Play DRM
• https://support.mozilla.org/en-US/kb/enable-drm

You should see a XHR request in the Browser Console.

• https://developer.mozilla.org/en-US/docs/Tools/Browser_Console

I'm on Tumbleweed, here is a must have site for openSUSE.

One-Click-Installers for openSUSE Multimedia Codecs: https://opensuse-community.org/

Here is a shot of the latest FFmpeg and libavcodec packages installed.

Make sure you have the latest FFmpeg and libavcodec packages installed. You can toggle DRM off/on to make Firefox (re)load DRM components.

• Settings -> General: Play DRM
• https://support.mozilla.org/en-US/kb/enable-drm

You should see a XHR request in the Browser Console.

• https://developer.mozilla.org/en-US/docs/Tools/Browser_Console

I will check it again.

If you want to dig for the issue try strace. see screenshots

I'm checking all your advices there.

Until now, I had done a new fresh installation of OpenSuse Tumbleweed and I still have the same problems. Seems to me that the codecs and DRM or XHR are causing the problem.

I will update it more. I had check over the internet before post it here. But the answers about he problem are very scarce.

Seem that the problem stopped from now. I don't know exactly what was, but I normally install my codecs following this page: https://en.opensuse.org/SDB:Installing_codecs_from_Packman_repositories

And I know that they get the packages from Packman repository. I had reinstalled it before even doing a new OpenSuse fresh installation.

Now with the new updates seems everything is running well.

I'm glad that everything is running smoothly now.

For anyone with the same problem just wait for updates and try to reinstall the codecs.

If the problem appear again I will open a new topic.