Firefox Community Forum

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.

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.

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.

This happened when I dl latest version of FF. Short Instagram videos presented as part of a story on yahoo.com website are not loading. I do not have Enhanced Tracking and never had this problem until installed newest version

Speakers are not muted. When I play a youtube video in Firefox I don't hear anything but if I play the same video in Chrome it works fine. I really prefer Firefox but I occasionally need to use my browser for Teams meetings and the audio doesn't work.