Diễn đàn hỗ trợ Firefox

Neither the [`

So how do I get them running? A significant portion of the internet runs on WebM and the fact that Mozilla's own dev docs can't show examples is a good indication of a problem.

Just built a new PC and using Win11. I like to have a pinned tab in Firefox playing some kind of media to have background noise. Since new build, whenever I am not 'focused' on that tab and doing other tasks, audio from that tab will cut/fade in and out.

I've been working on this for 16 hours. I've googled, binged, even yahooed. No answers. Checked and rechecked all settings, both system and browser. Uninstalled/Reinstalled *many* applications, including Firefox. My OCD won't let me rest till I have this solved.

Thanks for the help.

When I am watching a YouTube video and switch tabs, sometimes, on return to the YouTube tab, I have no sound. It is not muted. The system sound is fine. This does not always happen. I can switch tabs and still hear the sound. Then switch back and no sound. The video is not paused. I've tried pausing and playing the video, still no sound. Refreshing the tab doesn't help Where do I go to turn the sound back on? Win11, Firefox v144.02 64 bit.

I have a new Yoga Pro 7 and installed Ubuntu 24.04 on it. Cannot enable hw acceleration on it. Support page is given below. It says disabled by gfx. Also vainfo output is given below.

vainfo: VA-API version: 1.20 (libva 2.12.0) vainfo: Driver version: Mesa Gallium driver 25.0.7-0ubuntu0.24.04.2 for AMD Radeon Graphics (radeonsi, gfx1150, LLVM 20.1.2, DRM 3.61, 6.14.0-34-generic) vainfo: Supported profile and entrypoints

     VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
     VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
     VAProfileH264Main               :	VAEntrypointVLD
     VAProfileH264Main               :	VAEntrypointEncSlice
     VAProfileH264High               :	VAEntrypointVLD
     VAProfileH264High               :	VAEntrypointEncSlice
     VAProfileHEVCMain               :	VAEntrypointVLD
     VAProfileHEVCMain               :	VAEntrypointEncSlice
     VAProfileHEVCMain10             :	VAEntrypointVLD
     VAProfileHEVCMain10             :	VAEntrypointEncSlice
     VAProfileJPEGBaseline           :	VAEntrypointVLD
     VAProfileVP9Profile0            :	VAEntrypointVLD
     VAProfileVP9Profile2            :	VAEntrypointVLD
     VAProfileAV1Profile0            :	VAEntrypointVLD
     VAProfileAV1Profile0            :	VAEntrypointEncSlice
     VAProfileNone                   :	VAEntrypointVideoProc

In Firefox, When H264 frames are decoded and rendered within a single tab, the output reaches up to 180 fps, performing well and meeting expectations. When decoding and rendering occur on two separate tabs on parallel, performance significantly drops, impacting both processes. However, it performs smoothly when running on a single tab.

In comparison to the Brave browser, H264 decoding and rendering are noticeably slower in Firefox. Firefox manages only around 180 fps, while Brave and other Chromium-based browsers can achieve approximately 1000 fps on a single tab and around 800 fps when multiple tabs are open.

Document Link : https://workdrive.zohoexternal.in/external/writer/999ecda6e3a0b1ed2d4629c8480a6c1d595764234c29563e5bc8aa530cfbc431

Firefox is no longer playing audio from the Internet. I am running Firefox on Windows 11, and have the latest update installed (10/29/25). What happened? How do I fix this.

I am 99.5% sure this is a Firefox issue, as I have no problem playing audio files stored in my computer, and no problem playing Internet audio using Chrome or Edge.

Help!

I'm experiencing random (every few days) audio issues on 140.4.0esr on Debian trixie. Sound would randomly disapear. Firefox doesn't show on pavucontrol. Restaring pipewire doesn't help. To resolve I have to wipe FF profile and start from new profile. It is very annoying. What could be causing this problem?

Thank you.

Seems no sound from one website phone.com when trying to play mp3 voice messages - no problem playing sound in edge browser and other websites play sound ok using firefox. Have checked firefox app audio settings and all good - even can see audio bar moving - but no sound and it is not muted. Using windows 11 pro and firefox version 144 and my autoplay is set "allow audio & video" as default for all. Any help appreciated - thanks.

Hi Firefox team, I recently switched from Chrome to Firefox due to a recurring issue I noticed on my HP Omnibook laptop (productivity-focused, iGPU,). While watching YouTube videos in Chrome or Edge, I occasionally see a brief (0.1 second) black-and-white glitch near the top of the screen — but only when the video quality changes (e.g., auto-switching or manual resolution change). It never happens during regular browsing or local video playback. I’m testing Firefox now and wondering: - Does Firefox handle video stream transitions differently than Chromium-based browsers? - Is hardware acceleration in Firefox less prone to triggering such micro-glitches? - Any recommended settings or flags to optimize video playback stability in Firefox? - I was hoping to see an option to turn of AV1 video codec (if possible) I’m not gaming or doing heavy rendering — just casual productivity and media use. And I have switched on the default performance settings from my firefox browser setting. Would love to know if Firefox is better suited for this kind of smooth, glitch-free experience. Thanks in advance!

I am getting sick and tired of ytube video 153 error messages on the latest releases of Firefox when trying to access a ytube video. I use Firefox on Linux (Ubuntu and Mint) with multiple profiles and it didn't used to be this way!!

Even clearing the profile cache and history has unpredictable effect. The web is full of questions to this very issue with no definitive fix. It appears Firefox is not clearing things out properly even though the profile settings are set to delete everything upon exit.

What is the fix?? (or is there one?) A very frustrated longtime user.

I just switched to a new PC (Windows 11) and when using Firefox to watch videos, the audio fades in briefly instead of starting instantly. This happens with youtube, prime video, netflix etc. I have tested in Edge and this does not occur. I am using a bluetooth headset. I haven't been able to find anything about this online so open to any help.

Hello community,

Since the last update, I have been experiencing issues with streaming services, such as Disney+. Playback is no longer scaled correctly in full-screen mode.

During playback, the image is displayed much smaller with black borders at the top and bottom, as if Disney+ and Firefox are unable to communicate the format correctly.

I have already searched the web for this issue and have not found any articles with the same error description.

System: Win11 Pro, everything is up to date, WIN resolution: 3440 x 1440 (125% scaling)

Attached is a screenshot with the playback in full screen mode. I have framed what is displayed.