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Hello everyone,

I'm looking for ways to troubleshoot streaming video issues in Firefox. Sometimes video playback can be affected by browser settings, the internet connection, or device performance.

What steps should I follow to identify the cause and improve playback?

I also came across Selvydia while researching IPTV and streaming services. Would browser troubleshooting differ depending on the streaming platform being used?

Thank you for any practical suggestions.

Hi Mozilla team & community,

I am facing a persistent video playback issue specifically in Firefox (latest build on Windows 11), while the exact same stream plays flawlessly on Google Chrome and VLC media player.

When attempting to stream high-definition HLS live content from my media portal site (https://bidarn.com), the video stalls and buffers every 10–15 seconds. Upon inspecting the Firefox Web Developer Console (Network tab), I notice frequent `NS_ERROR_NET_TIMEOUT` errors during the loading of .ts media chunks, along with occasional CORS flags during concurrent HTTP requests.

I have already completed the following standard troubleshooting steps: 1. Disabled Enhanced Tracking Protection for the domain. 2. Started Firefox in Troubleshoot Mode (Safe Mode) with all extensions turned off. 3. Cleared all cookies, site data, and browser cache. 4. Tested with hardware acceleration toggled ON/OFF.

Unfortunately, the segment fetching latency remains high in Firefox.

Are there specific parameters in `about:config` (such as adjusting `network.http.max-persistent-connections-per-server` or expanding `media.cache_size`) that can optimize how Firefox handles parallel HLS segment fetching?

Any technical guidance or network config recommendations would be greatly appreciated.

Okay so this never happened with Chrome, so I'm assuming it's a firefox only issue. Whilst I'm watching a video, if said video is playing in fullscreen, it'll often fade to black during different parts, such as whenever a flash happens or quick cuts (e.g. a film with lightning strikes, causes it to fade to black and it stays like that). It is SUPER annoying and it causes me to have to rewind if I miss something because of it! I don't watch YouTube in fullscreen because of it, but it even does it in streaming services! I honestly have had enough but do not want to switch back to Chrome.

Took this photo of the movie Cruella because I knew there was loads of flashing lights at one scene. You can see that the video is faded but the rest isn't. The second image is when I click multiple times to try and stop it! But it happens again directly after.

And yes, I've tried the 'full-screen-api.transition-duration.enter' and 'leave' in Advanced Preferences.

Hello, I need the player's audio to keep playing while watching a video in the browser—essentially allowing two audio sources to run simultaneously. I have already configured all the necessary audio settings in both the player and the system.

My computer just updated Firefox. Since that happened I can't stream a movie in full screen. That is, I can make the window as big as the screen, but I can't hide the tabs, time and date, pull down menu titles, etc, I want to see nothing but the movie. On Netflix you typically do this by clicking on the rectangle in the bottom right corner. But now nothing happens when I click on this. Can you help with this?

Thank you

I uploaded an image to show what I mean, but nothing is showing next to the words Uploaded images.

I'm not sure when it started happening, but whenever I'm watching something full screen, or just full screening, Firefox on Mac, there's this thin white line at the top of the window that's very distracting. Has this been happening to anyone else and does anyone else know how to get rid of it?

Здравствуйте!

Столкнулся с проблемой при просмотре видео на YouTube в Firefox на Windows 11.

При переходе видео в полноэкранный режим панель задач Windows не скрывается и остаётся видимой поверх/под окном браузера. В других браузерах, например Google Chrome, такой проблемы нет.

Единственный способ временно решить проблему — нажать F11 и перевести сам Firefox в полноэкранный режим, однако это неудобно, поскольку я часто переключаюсь между вкладками и сворачиваю/разворачиваю браузер.

Проблема возникает именно при использовании стандартного полноэкранного режима YouTube.

Я могу предоставить все необходимые диагностические данные: сведения о системе, версии Firefox, настройки `about:config`, логи, скриншоты или любую другую информацию, которая может помочь определить причину.

Подскажите, пожалуйста, как можно диагностировать и исправить эту проблему?

Спасибо!

I checked the parameters:

full-screen-api.ignore-widgets = false browser.fullscreen.autohide = true

I restarted File Explorer, the browser, and the PC; the problem only occurs in Firefox. At the same time, if I press F11 in advance, then when I press F again or open a full‑screen video with the mouse, the taskbar no longer interferes. I tried running the video in incognito mode, but the problem persists.

YouTube videos are frequently buffering and sometimes play slowly in Firefox, even when my internet connection seems to be working normally. Please help me identify the cause and suggest steps to fix the problem. I would also like to know whether any Firefox settings, extensions, cache, or hardware-acceleration settings could be causing this issue.

The mobile version of Firefox comes with a player featuring a purple progress bar and all the basics, but there’s one thing missing: the ability to fast-forward and rewind. I use this a lot on news sites, for example, or when listening to podcasts on websites. Not being able to fast-forward in this way means I miss information or have to keep moving the bar until I find the exact spot. Is there any way to change this?

Title pretty much says it all. got the new update and now every time i watch a video on Disney +, the pause menu will fade then the video goes super dark. it was working fine yesterday

Since one of the most recent updates, I've been having the following problem:

A video from YouTube or Twitch is playing in full-screen mode in Window 1.

When I open another window and switch back and forth between the two windows, the second window doesn't fill the entire screen, and instead of the Windows taskbar, part of the video from Window 1 is displayed at the bottom. Is there a way to change this back?

Translated with DeepL.com (free version)

When I play YouTube videos in Firefox for Android, the video keeps pausing and buffering constantly. I have tried clearing browser cache and disabling all extensions, but the problem still occurs. My device is Android mobile phone. I hope to get help to fix this playback stuttering issue.