Firefox Community Forum

Since Flathub list the org.mozilla.firefox app as official, i hope this is the correct support channel.

Recently i switched from distro specific package managers to flatpak as my application provider. The firefox flatpak won't play most embedded Video/Media on applications like in-browser fediverse clients, forums, blogs or wikis. Youtube works without any issues, Twitch is fine until there is an adbreak. Then it sometimes stops with the supported format/mime error (screenshot appended), only recoverable by cache-dismissive reload.

I used this Article https://support.mozilla.org/en-US/kb/audio-and-video-firefox and the links it contains to debug without any success. None of these samples play. just shows supported format/mime error https://test-videos.co.uk/bigbuckbunny/mp4-h265 At this test website 1. and 3. example won't play. I provided a screenshot before and after trying to click play on all the examples. https://www.tekeye.uk/html/html5-video-test-page

Contrary to the observed behavior about:support#media claims Software Decoding supported for everything except HEVC.

Chromium Flatpak has no such issues. So i copy the video url and play it with chromium. You can see: dire times.

This is a functional bug, not a settings issue. Block media autoplay in Firefox cannot work, after I right-click on a blank area of the page and scroll.

For example, I saw a post with a video on x.com, and the site was set to prohibit automatic video playback. But when I right-clicked on the webpage and then scrolled the page with the mouse, the video started to play automatically, which means that the function of prohibiting video playback was invalid. Very strange.

Firefox version: 141.0.3 (private-browsing No extensions are running) OS: Windows11 Enterprise 26100.4946

No sound, thought speakers went bad. Bought a microphone and still no sound. How do I do Doxy.Me or Zoom without outgoing sound?

I cannot play embedded Youtube videos, but they work when I open them in Youtube.

When embedded, after starting the video, I only see the circle animation (loading), but the video never starts.

Example: https://telex.hu/video/2025/07/30/gazdagret-plebania-katolikus-egyhaz-lidl-zoldterulet-lakossagi-forum

What I tried so far: 1. turning off hardware acceleration 2. private window 3. troubleshoot mode

The issue has been going on since a long time already, and present on both Windows and Linux Ubuntu.

Sound on Rumble. It has always had an Enable Button with a bell, and clicking on that button has always enabled the sound at the videos I watch on Rumble. Recently, clicking on the button, adjusting the sound on Rumble settings in the video, and boosting the sound on my computer do not work. I'm hoping that can be fixed. Thanks in advance.

I've recently decided to return to FF. On the whole everything is going fine, except for streaming. I often use my provider's site (nostv.pt) to watch some games, races or shows. However, every time I do, I'll get backwards skips every now and then where the stream goes back 1-2s. Usually the second time this happens the stream detects I'm no longer live and I can skip ahead to real time, but this is annoying, especially when watching games. During a 2h stream session this will happen around a dozen times.

So I would like to know if there are other people with the same issue or what I can do to prevent this from happening.