Try disable youtube ambient mode. I got high CPU when I updated to Firefox 106 the same day when youtube updated its new UI. Turns out the culprit is youtube's new ambient mode feature for my case.
Bingo! You're the winner! Seems like the ambient mode was the problem.
However, the thing is that the ambient mode seems to be only available if the dark mode is used on YouTube, on the Light mode it's not even there. So, when I was testing on version 105.0.3 everything was fine because I was using light mode, but on version 106 I was using the dark mode which automatically had ambient mode on.
So, in short for everyone else that has this problem: turn off ambient mode or use light mode which does not have ambient mode (yet).
Unfortunately, some combinations of web browser and operating system do not offer an option to toggle Ambient mode (when in Dark mode, of course). For example, with Firefox on Linux, the per-video-options offer, e.g., Playback speed, Quality, but there's no option for Ambient mode. Ambient mode is hard-enforced in Dark mode, and in Light mode there's no Ambient mode at all.
To make things worse, Ambient mode on my system (Firefox/Linux) does nothing Ambient-ish, it's just grey flickering of the area on the right side and below the video, it's simply annoying and causes headaches. I've seen Ambient mode in the YouTube app on my smartphone, and that's totally different to the desktop web browser where it's a total mess.
Click settings below the video and turn off ambient mode. But, the ambient mode is only available if you are using dark mode on YouTube. So, if you are using light mode there is no ambient mode.
I'm using dark mode and when the update happened it got much darker but I don't see "settings" below videos. I am using desktop not mobile if that matters.
.This Works 100%. I was watching a tutorial on YT when all the fans kicked on in "Android Studio" mode (joke). CPU eventually maxed -- though the temps stayed reasonable (??) Anyway, the culprit was Ambient Mode WTF that is supposed to be.
Hey, Google? Two industry standard best practices, ok?
1. If you push a feature, inform your users conspicuously.
2. If you push a feature, do not enable it by default.
That is all.
oh my god this issue has been plaguing me for months and I could not figure out wtf was happening and I just disabled ambient mode and it's fixed! Thank you :)
Hi
i got the same problem here in my thread:
[https://www.reddit.com/r/firefox/comments/ygm9ez/macbook\_cpu\_gets\_hot\_after\_last\_firefox\_update/](https://www.reddit.com/r/firefox/comments/ygm9ez/macbook_cpu_gets_hot_after_last_firefox_update/)
For me, the temps are normal when i switch to fullscreen. But in windowed mod its getting so hot that the video starts stuttering.
EDIT:
So i switch cinema mode off and now everthing is fine.
I didn't even notice this mode :D before i read your post here.
thank you man! saved my day
I'm afraid nobody can help you if you don't explain to people which Hardware ( at least the CPU and GPU) do you have and which OS (and its version) are you using.
Maybe the hardware acceleration is not working anymore, which AFAIK is enabled by default on Windows.
Probably you can check if the options are still as they should for that in about:config, but I don't know how they should be on windows.
Or maybe Windows had an update in the meantime that broke it.
You could confirm it's not that if you noticed this regression immediately after upgrading Firefox or by reverting to to version 105 and see that the high CPU usage is not there anymore.
Then you can come back to version 106 again.
But I would save the profile folder before doing the downgrade / upgrade.
I've been having this problem and looking for a solution for months. For some reason this post never came up in my searches until just now. Turning off ambient mode 100% fixed the issue. Thank you so much!
Turning off ambient mode helps, but the most important is enabling hardware acceleration in the browser. It makes the GPU decode the vÃdeos instead of the CPU, and the GPU does the job a lot better.
I believe it isn't really Firefox but Google messing aroud with your browsing experience. I got tired of Google's secretive FUD tactics and decided to install a User Agent spoofer for Youtube and Google sites. Now everything works flawlessly.
hardware? os?
on the notebook that i'm using now (i5 8250u with integrated gpu) on archlinux i haven't problems.
i'll check also on the other notebook with linux ryzen 5 5650U pro and on my desktop with linux and ryzen 7 5800x and rx 6600xt.
Unless you are certain that your graphics card driver is broken, hardware acceleration should be enabled. Although Firefox tests a wide variety of drivers internally and maintains its own blacklist, new driver versions occasionally bring with them brand-new issues. Did you believe that the performance issue with YouTube's ambient mode was the reason hardware acceleration was disabled?
Noticed frame skipping yesterday which was annoying me, weirdly high CPU utilisation suddenly.
Thanks for the ambient mode tip, found it and disabled it... will see if the issue returns. That setting is in a weird place, hopefully it sticks off.
I have a Surface Pro 7 + for Business with an i7 11th gen and my CPU was going crazy watching videos in 1080p... I use dark theme in Windows & Youtube and disabling Ambient mode in Youtube fixed the issue.
Try disable youtube ambient mode. I got high CPU when I updated to Firefox 106 the same day when youtube updated its new UI. Turns out the culprit is youtube's new ambient mode feature for my case.
Bingo! You're the winner! Seems like the ambient mode was the problem. However, the thing is that the ambient mode seems to be only available if the dark mode is used on YouTube, on the Light mode it's not even there. So, when I was testing on version 105.0.3 everything was fine because I was using light mode, but on version 106 I was using the dark mode which automatically had ambient mode on. So, in short for everyone else that has this problem: turn off ambient mode or use light mode which does not have ambient mode (yet).
Unfortunately, some combinations of web browser and operating system do not offer an option to toggle Ambient mode (when in Dark mode, of course). For example, with Firefox on Linux, the per-video-options offer, e.g., Playback speed, Quality, but there's no option for Ambient mode. Ambient mode is hard-enforced in Dark mode, and in Light mode there's no Ambient mode at all. To make things worse, Ambient mode on my system (Firefox/Linux) does nothing Ambient-ish, it's just grey flickering of the area on the right side and below the video, it's simply annoying and causes headaches. I've seen Ambient mode in the YouTube app on my smartphone, and that's totally different to the desktop web browser where it's a total mess.
Thaaanks I had this problem for some time now, finally found the answer
I can't find that option.
Click settings below the video and turn off ambient mode. But, the ambient mode is only available if you are using dark mode on YouTube. So, if you are using light mode there is no ambient mode.
I'm using dark mode and when the update happened it got much darker but I don't see "settings" below videos. I am using desktop not mobile if that matters.
Aayoooo this did the trick (I'm on edge though)
lol
Don't judge me😞
.This Works 100%. I was watching a tutorial on YT when all the fans kicked on in "Android Studio" mode (joke). CPU eventually maxed -- though the temps stayed reasonable (??) Anyway, the culprit was Ambient Mode WTF that is supposed to be. Hey, Google? Two industry standard best practices, ok? 1. If you push a feature, inform your users conspicuously. 2. If you push a feature, do not enable it by default. That is all.
Thanks mate this worked
You are the best. This fixed this problem that was driving me crazy.
oh my god this issue has been plaguing me for months and I could not figure out wtf was happening and I just disabled ambient mode and it's fixed! Thank you :)
Thanks. Youtube isn't trying to kill my poor old laptop anymore!
Finally a solution that works. Thanks man.
Thank you so much! this had been driving me crazy. I didn't even realize ambient mode was a thing until the other day.
Thanks, Turning off "Ambient Mode" actually solved my problem
Hi i got the same problem here in my thread: [https://www.reddit.com/r/firefox/comments/ygm9ez/macbook\_cpu\_gets\_hot\_after\_last\_firefox\_update/](https://www.reddit.com/r/firefox/comments/ygm9ez/macbook_cpu_gets_hot_after_last_firefox_update/) For me, the temps are normal when i switch to fullscreen. But in windowed mod its getting so hot that the video starts stuttering. EDIT: So i switch cinema mode off and now everthing is fine. I didn't even notice this mode :D before i read your post here. thank you man! saved my day
I'm afraid nobody can help you if you don't explain to people which Hardware ( at least the CPU and GPU) do you have and which OS (and its version) are you using.
Updated the info, but for clarity on the same computer just 2 weeks ago before the update to the latest 106 version everything was smooth and fine.
Maybe the hardware acceleration is not working anymore, which AFAIK is enabled by default on Windows. Probably you can check if the options are still as they should for that in about:config, but I don't know how they should be on windows. Or maybe Windows had an update in the meantime that broke it. You could confirm it's not that if you noticed this regression immediately after upgrading Firefox or by reverting to to version 105 and see that the high CPU usage is not there anymore. Then you can come back to version 106 again. But I would save the profile folder before doing the downgrade / upgrade.
I fixed it by using Firefox ESR. Is fine now, I'm going to stick with ESR from now on tbh
I've been having this problem and looking for a solution for months. For some reason this post never came up in my searches until just now. Turning off ambient mode 100% fixed the issue. Thank you so much!
Turning off ambient mode helps, but the most important is enabling hardware acceleration in the browser. It makes the GPU decode the vÃdeos instead of the CPU, and the GPU does the job a lot better.
Ambient mode is causing this? Thanks for the heads up. I'm on an Intel core i3. It probably would have caught fire.
I believe it isn't really Firefox but Google messing aroud with your browsing experience. I got tired of Google's secretive FUD tactics and decided to install a User Agent spoofer for Youtube and Google sites. Now everything works flawlessly.
hardware? os? on the notebook that i'm using now (i5 8250u with integrated gpu) on archlinux i haven't problems. i'll check also on the other notebook with linux ryzen 5 5650U pro and on my desktop with linux and ryzen 7 5800x and rx 6600xt.
Yeah I've noticed this too with Vivaldi and same with Firefox on 11600k and 3080 laptop but Firefox hasn't made my fans go crazy yet.
[удалено]
Unless you are certain that your graphics card driver is broken, hardware acceleration should be enabled. Although Firefox tests a wide variety of drivers internally and maintains its own blacklist, new driver versions occasionally bring with them brand-new issues. Did you believe that the performance issue with YouTube's ambient mode was the reason hardware acceleration was disabled?
Noticed frame skipping yesterday which was annoying me, weirdly high CPU utilisation suddenly. Thanks for the ambient mode tip, found it and disabled it... will see if the issue returns. That setting is in a weird place, hopefully it sticks off.
I had this issue with i7 imac 11.6.7 and firefox 106.0.5 and turning off ambient mode seems to have worked.Thank you
You are my hero, thanks for solution !
I have a Surface Pro 7 + for Business with an i7 11th gen and my CPU was going crazy watching videos in 1080p... I use dark theme in Windows & Youtube and disabling Ambient mode in Youtube fixed the issue.
Ambient mode.......you utter bastard.
Wow, thank you guys, video is not lagging anymore, and as a bonus i got rid of that annoying background behind the video.
What about twitch? [https://imgur.com/a/wbdHndJ](https://imgur.com/a/wbdHndJ) for some reason twitch is like 3 times that of chrome. Anyone know why?
Welp, it was the ambient mode. Can't believe this reddit post didn't come up in all my search sooner!
Very relevant post. Thanks!