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I just upgraded Firefox to version 156.0.2.

It no longer plays mp4 content from a website. It says "No video with supported format and mime type found".

This used to be OK.

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?

All of a sudden all of the videos I watch on YouTube with Firefox are defaulting to mute on my Macbook. I haven't made any changes to settings, etc. I don't have a YouTube account so I can't make any changes there anyway. I am having to unmute each video before I watch 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.

Hello, this is the basic problem:

The short version is that there is a problem with Firefox not interacting with the scrub bar and volume bar. (all other controls work fine) We know it's a Firefox thing because everything works with Brave. (or an interaction between Firefox and the OS at least, Firefox is heavily involved)

There is more detail and we have done some work on it here: CashyOS forum post

You can use the Firefox manifesto V0.2. video for an example, as it displays all the above problems for me.

I can get you guys whatever other data might be needed, but I kinda need an idea where to look to try and fix this, as all the other posts I have managed to find don't seem to have similar enough issues to work.

Edit/Update: I have done some further testing and discovered that it is firefox's default/built in player that is the problem. I can use the 'site specific' players (like from reddit) just fine. So there is something happening with that default one.

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.

You can write:

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.

Hello, I am currently using windows 11 with firefox 149.0. Regardless of what website I use (youtube. steam etc), the browser struggles to establish consistent connection to my bluetooth earbuds. It connects for one moment, but then soon the volume goes out and eventually it disconnects. Though it would reconnect soon, the cycle just keeps ongoing. I have experimented with other apps and browsers, as well as multiple bluetooth earbuds of other brands to be sure that it is a firefox issue. I have checked the volume mixer menu to ensure that there is nothing wrong. I have also made sure that my drivers are all up to date with no issue. But the issue still persists.

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

When i go to fullscreen from default view on YouTube, the screen becomes grey but the video is still playing and the audio is working fine. However, i can go to fullscreen just fine if im in cinema mode. How do i fix this?

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?

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