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As of Nov. 12th, 2025 (Firefox Version 145.0 (64-bit)) entering full screen for a video reveals desktop/other program windows.

Tested with different websites, YouTube, Amazon Prime Video and Hulu. Issue is consistent across.

In the images provided there are two sets, one full screen the other not. Set desktop background to bright green to highlight issue.

If it matters, using dual monitor setup (BenQ Mobiuz EX2510) both are 1080p 144hz side and issue occurs on both monitors.

Have already tested basic troubleshooting issues such as restarting Firefox and computer.

Thank you.

Recently, if I am playing audio from Firefox on my phone, the audio stops when my phone screen is locked. This did not used to happen and does not happen if I play the same audio from Safari. I am using an iPhone 17 Pro running iOS 26.1. I have tried resetting the phone and removing and reinstalling Firefox, but it persists. The problem does not occur with audio played from the same webpage through Firefox using my iPad, logged into the same Firefox account.

There's already a decent help article about how to block videos from autoplaying:

https://support.mozilla.org/en-US/kb/block-autoplay

The problem is, it works haphazardly. Even if my default for all web sites is "Block Audio and Video", on some web sites (not all) embedded videos still start playing as soon as they scroll into viewport.

Some have adviced to delve into about:config and set media.autoplay.blocking_policy to 2 (default is 0) and, based on quick testing, that actually seems to help but why exactly does it help? If privacy settings already have a setting to block autoplay, why does that particular configuration change make it work as it is supposed to work?

Running Floorp 12.5.0 (Firefox offshoot) on Win11, if that helps.

Hello,

I am having an issue with my Bluetooth headphones (Sennheiser HD 450BT) in Firefox on Windows 11.

The headphones are properly connected to Windows and work correctly with other browsers (Edge, Chrome).

Windows shows the headphones as the default output device (stereo), and test sounds play through them.

However, in Firefox, the audio does not go through the headphones. Instead, it plays very loudly through the laptop speakers.

The problem started today; there were no issues for about a year.

I have tried reconnecting/reinstalling the headphones, but it did not help. Drivers are also up to date.

Could you please advise how to make Firefox correctly use my Bluetooth headphones as the audio output device?

Thank you for your assistance.

For a couple of days now Instagram linked videos won't play here. Actually some of them will -- my own reels and anything linked with that button that looks like a movie 'clapper'. But videos that show the triangular arrow pointing to the right, nothing happens when you click. Not sure if this is a FF issue or maybe something changed at Instagram. Did a google search and nothing came up.

I am running Firefox 144.0 on kubuntu 24.04.3 LTS I have lost sound on Firefox. I have opened the same sites in Chrome and the sound is working fine. It's only in Firefox. I have tried several sites including Udemy, YouTube, and radio programs, no sound from Firefox. The problem started in the middle of a Jit.Si session. All of a sudden the sound disappeared. I thought that restart Firefox would help, then restart the computer would help. But the problem has continued. The speakers is turned on the volume is up, just not a sound from Firefox. What to do?

Last night I updated my iPhone 11 Pro to iOS 26.1

Since the upgrade I'm unable to have Firefox play audio for a music stream I listen to when the phone goes to sleep/lock or if I use the app switcher to switch to another app, like Maps.

This wasn't happening yesterday when I was using my phone and listening to the same audio stream in my car with Maps open for navigation.

This video file cannot be played.(Error Code: 102630)

I’m getting this error for some reason, and I can’t figure it out. I’ve tried downloading various support files for different codecs, yet I still can’t play videos on websites or live videos like YouTube livestreams.

I’ve tried reinstalling the browser, VLC, and updating the media drivers, but it still doesn’t help. The same videos run fine in other browsers like Edge, but for some reason, they won’t play in Firefox.

Hello, I am facing an issue while playing YouTube videos in Firefox. The videos are lagging and not playing smoothly, even though my internet connection is fine. Please help me fix this problem.

For the last two years the issues with video stutter have been worse and worse for me. I don't know if it is because of a different codec the video is using, but if it was I would expect the fans to ramp up from trying to decode it. Instead, my laptop stays always silent, but the video laggs like crazy when I want to play it at native 1440p.

I cannot view or change the video codec, since the current issue happens on a platform (herohero.com) other than youtube.

Whenever I play videos on YouTube in Firefox, the video is always choppy and does not run smoothly. I’ve tried restarting the browser and checking my internet connection, but the issue continues. This problem only happens in Firefox, not in other browsers.

Hi, how can i disable background playback, when the browser is closed and the screen of the device is off? For example, when I'm watching a YouTube video, then I close the browser and turn of the screen of galaxy s10 ultra, the audio continues playing on the background while the browser is closed and the screen is off. I don't have the kind of problem with other browsers. I tried all of the settings, but didn't find anything in the settings thatt can disable the background audio. The only way to stop the background audio playing is by forced closing of browser or manually stopping the video playback on the YouTube video itself.

Thanks.

Speech output for Albanian on the website "loecsen.com" > language course "Albanian". Words cannot be heard under Windows 11. What can I do? I downloaded the Albanian language pack, but the voice isn't there. Is this a Firefox or Windows problem?

Link: https://www.loecsen.com/de/lernen-albanisch

Greetings from Switzerland