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Some videos work perfectly fine, however for some videos audio lags behind the video. The same video file perfectly works in Chromium as a control test. Example file is MP4, inside was initially h264 video with AAC audio, for test I re-encoded video to be svt-AV1 with AAC / flac as well - no difference, audio still lags behind. Local players (mpv) and Chromium works perfectly. No plugins which can affect it - for testing disabled them all. I really try hard to like Firefox but this thing is a real bummer. Any ideas what can be causing? P.S. I tested both firefox compiled from source and binary package provided by my distro. Linux system if that matters.

When I am using the android Firefox browser to watch YouTube, it is fine when browsing and finding a video. I will click on a video just fine, and start watching it no problem. The issue occurs when I switch tabs or switch apps to do something else and return later. Once I return to the YouTube tab even if the video is not or was never in full screen, Firefox will then be forced into landscape orientation. This persists between tabs until I either restart the app or do a Google search.

I found a potential solution in these forums. In about:config there should be a setting called media.videocontrols.lock-video-orientation. I tried this, but there is no such setting there for me. I'm at a loss for what to do now.

Whenever I'm watching YouTube and a video goes to the next, it resets back to default setting for the video. Is there a way to fix this? And I've tried to reset my cookies and site data, didn't work.

I've noticed that Youtube videos on Firefox are far more washed out when compared to Google Chrome. HDR is enabled on my Monitor and in Windows 11; however, the issue is present for standard SDR videos as well. Any idea what is going on here?

I've started watching YouTube through my browser and I've begun to notice that it'll automatically change the settings on the site to block autoplay of audio and video, which stops background play.

I have the setting set to allow autoplay audio and video.

I notice it when I switch from the tab and it'll stop playing so I go to the page specific settings and it's switched to block.

How are they doing this? And what can I do to stop it from doing this?

Auto Play. Browser tabs to youtube videos, and maybe others are now playing automatically after update to Firefox 148.0 (64bit).

it was NOT doing this before this Firefox update to 148.0 (64bit).

I am running Windows 11 (64bit).

I'm exploring Steam Deck desktop mode more and I'm running into issues with Firefox not rendering some videos on my personal website. I wasn't sure if it was a Steam Deck, KDE Plasma, Firefox, or an issue with something else, so I tested the same website with Vivaldi and the video played without any issues. This makes me feel like it's probably Firefox, but not totally sure yet.

I've already tried adjusting the autoplay media permissions for the website from the default to "Allow Audio and Video" in case that was doing something. I've also tested in Troubleshoot mode to see if the one extension I have installed was causing any issues and that didn't change anything either. Any other ideas I can try? Or, is there some way to determine if this needs a bug fix/there's nothing I can do on my end?

While watching netflix, I randomly get error code F7361-1253 which prevents the video from playing. Can happen at any random time while watching. I have had firefox for years and have only got this issue in the past few months. It does not happen on other browsers like chrome.

I have tried disabling all extensions and troubleshoot mode, doesn't fix it. I didn't change any firefox settings since this started happening. DRM is enabled, widevine is the latest version, so is firefox, fully updated. I am using Windows 11 Home, 10.0.22631 Build 22631

These are the warnings I got in the console as soon as the netflix error pops up:

Cannot play media. No decoders for requested formats: audio/mp4; codecs="mp4a.40.42" 81036307

Media resource blob:https://www.netflix.com/6bc68eac-89ce-4b21-afcd-f78b0a3908ce could not be decoded. 81036307

This error message will be blank when privacy.resistFingerprinting = true. If it is really necessary, please add it to the whitelist in MediaError::GetMessage: ipc::IPCResult __cdecl mozilla::gmp::ChromiumCDMParent::RecvDecodeFailed(const uint32_t &): ChromiumCDMParent::RecvDecodeFailed with status kDecodeError (5) cadmium-playercore-6.0055.308.911.js:1:568518 WEBGL_debug_renderer_info is deprecated in Firefox and will be removed. Please use RENDERER. cadmium-playercore-6.0055.308.911.js:1:372306

Media resource blob:https://www.netflix.com/6bc68eac-89ce-4b21-afcd-f78b0a3908ce could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) Details: ipc::IPCResult __cdecl mozilla::gmp::ChromiumCDMParent::RecvDecodeFailed(const uint32_t &): ChromiumCDMParent::RecvDecodeFailed with status kDecodeError (5)

I have ffmpeg on my system and haven't touched it in a while.

Hello, I’m using Mozilla Firefox on Windows 10.

The issue happens mainly on YouTube: – Videos stutter every few seconds – Audio sometimes goes out of sync – This happens on 1080p and 720p – My internet speed is stable (~XX Mbps)

I use Firefox on both my work and home computer as well as my Android phone. I have for years, and until I got a Surface 8 Pro with Windows 11 Home (in case that matters), the behavior across devices was generally consistent, especially after I created a profile and signed into it across all of my devices. Firefox on that device, though, has given me a couple weird differences/issues.

First, I've noticed that the pop-up blocker seems much more "sensitive" on my home computer than on any other devices. A link I click on on my home computer will trigger the pop-up blocker, whereas my work computer will just send me to the link. An example where I see a different behavior is on the Wordle home page: https://www.nytimes.com/games/wordle/index.html. When I click the light bulb at the top on my home computer, the pop-up blocker is triggered, but when I do the same from my work computer, it just goes straight to the link that icon is for.

Now more recently, I've found that sound from a webpage (say YouTube) played on my home computer comes out of the speakers regardless of whether there's a device in the audio jack, which of course my work computer does not do. I've confirmed it's a Firefox problem and not a larger device problem, as other programs output to the audio jack when something is plugged in there just fine.

I've tried resetting my device obviously, and I've even tried doing a Firefox refresh, progressively deleting more and more profile information, and finally uninstalling Firefox completely, removing the Mozilla folder in %APPDATA%, and removing the registry entries that Revo Uninstaller identified, to try to make it as close as possible to the "factory" default, all to no avail.

Images appear fine, but lately I cannot see embedded videos on websites when I'm browsing. This is a recent change (past couple of weeks).

I can view the same videos using another browser, so I think this is a firefox setting possibly.