Firefox Community Forum

Firefox149开始，网页看抖音，每滑到下一条就卡顿2，3秒，换回148及之前的版本就没这问题 Starting from Firefox 149, when watching Tiktok videos on the web, there is a lag of 2-3 seconds every time I swipe to the next item. Switching back to versions 148 and earlier does not have this issue， https://www.douyin.com/

I recently (within the last month) gotten an update in windows 11 and all of a sudden firefox slows way down and eventually stops doing anything...Any ideas what I can do to get firefox to actually work all the time??? I am using firefox 149.0 and it says it is up to date...

The window is not coming, up. shut it down with task mgr. Deleted xul.json file and it worked for a little while. but broke toady. Windows update done andn restarted.

I have a problem with 'efficiency mode' in Windows 11. Windows 11 forcefully puts many of Firefox's tasks into efficiency mode marked by green leaves within task manager in processes tab. It doesn't seem to do this to anything else except Steam Client WebHelper. My Laptop is always in max performance mode in all possible settings as it is always plugged in (this does not influence efficiency mode). It slows down performance making things take longer to load and might even break them. If you try to enable efficiency mode on a task it even warns you of this: 'Efficiency mode will lower process priority and improve power efficiency but may cause instability for certain processes. Do you want to continue?' There is no way to permanently disable it. Currently out of 19 tasks 8 are in efficiency after I woke up my laptop from sleep (I have 5 tabs open). Only way to stop it is to manually disable each one by one (right click on each task and disable efficiency mode). But Windows 11 will turn them back on automatically usually within a few seconds (it seems to depend on opening new tabs, reloading them or waking up the PC from sleep mode). From looking it up online there seems to be a way to disable it in browser on Edge and Chrome but that might be something else (I do not use the so I'm not sure). There was a solution for Chrome but it doesn't work on Firefox.

Is there any way this can be disabled permanently through Firefox or Windows 11?

Lately I can not click all of my browser tabs, only some of them unless I do not have the browser maximized on the screen. If I make is smaller then I can click all of the tabs. Since the recent Firefox update I can't find a hardware acceleration setting to toggle off to see if it helps.

Hi Mozilla Can you improve firefox 115 in next update because this browser is slow and need to improvements in performance, i'm using windows 8.1 and i'm can't upgrade to windows 10

After updated to 149. Tab unloader is totally broken, unloaded tabs won't be discard but hold in shared web processes then reload right away. Extension process ram consumption bloated then cause browser lost response. If it not a hard hung up it would stop loading data from web. And/Or not operate when switch tab. Every action is risking frozen only way to unfreeze is to kill the extension process while risking complete lost of response. Never seen such piece of shit in decades.

Hi, I notice today that Firefox takes a really long time (~30s) to start. The main Firefox frame opens, totally empty, no tabs, nothing... and ~30s after, it starts.

I also notice that it is linked whith the VPN. When the VPN is active : long time, when the VPN is paused, normal start.

I have two computers, same reaction ! The first computer is used every day, so I have the problem on this one since the last update (I suppose).

The second computer has not been used for a week. I started the second computer today , I checked the VPN is active, I notice the first use of Firefox (which was still v148...) was as fast as usual, then Firefox automatically updets to 149.. and restart, and then, same behavior : long time as start.

I tried to go back to version 148, without any better results.

Can you help me please?

Two computer are in W11 up to date, and the VPN is NorthVPN up to date

Regards Alain

I am on arch linux, Wayland KDE Plasma. KDE Plasma Version: 6.6.3 KDE Frameworks Version: 6.24.0 Qt Version: 6.10.2 Kernel Version: 6.19.9-arch1-1 (64-bit) I then ran firefox (Both Flatpak and Pacman fail ), and no matter what (MOZ_ENABLE_WAYLAND on or off) when in pointer lock, the high polling rate mouse was significantly slower than the lower polling rate touchpad. I have tried different mice with high polling rate, the result is the same. https://mdn.github.io/dom-examples/pointer-lock/

Hello Community,

I have been experiencing significant issues with Firefox for the past couple of months. The main concern is high CPU and RAM consumption during video playback, especially on YouTube.

This issue started appearing only for the past month or two; it was never present before on the same system, and no significant hardware changes have been made.

Crucially, this problem is exclusive to Firefox. I have tested video playback on other browsers such as Google Chrome, Brave, and Microsoft Edge, and do not face any similar performance issues with them.

Your assistance in resolving this is greatly appreciated.

Thank you.

Good morning. I don't know how to describe it well much less grab a screenshot as it happens so quickly. Occasionally when I open Firefox which is always full screen a blank/black smaller browser window opens/appears for a second or so and then the browser opens as normal. It does not happen every single time. It's like on the way to opening the browser takes a step and then activates. The browser is up to date and seems to be working fine. I am attempting to catch a screenshot but as I said it is so quick. I don't know how to describe it any better. If anyone can help I would certainly appreciate it. I have run multiple antivirus, malware and spyware programs and found no issues.

suse linux 15.6 firefox 140.9.0esr (64-bit)

An aggressive website can cause "isolated web co" processes to be started. When they hog all processors and memory, the computer besomes unresponsive. Keyboard and mouse freezes up.

Is there a way to limit firefox processes to n-1 processors, leaving 1 processor available for me to kill it ?

On my Windows 11 IOT Enterprise LTSC system firefox does not entirely close. After I installed my professional tax software from Drake Software LLC the following happens repeatedly: I open Firefox, look at a page, close Firefox, the screen clears and when I try to REOPEN firefox a popup says that it is still running and offers close or cancel. Neither button opens,closes or cancels Firefox. I have to reboot to make Firefox (147.02 64bit) close. This happens every time I open Firefox.

I recently got a new laptop with Windows 11 Pro. I installed Firefox from the Mozilla site. When I click to open Firefox, it takes a long time - 41 seconds to be exact. I uninstalled, reinstalled and restarted my computer. I cleared the cache. I tried to run as administrator. Not sure what else to try. As I wait for it to open, it reads "not responding" in the search bar area. Any ideas?

I've just upgraded to V149 and, when using NordVPN, Firefox is now taking at least 30secs to startup. If NordVPN is off startup is instant. Prior to V149, Firefox startup was instant, both with and without NordVPN.

everytime I try to get to my sites its very slow and it says mozilla firefox not responding If I wait for a while it will finally allow me to get to my site but it takes a long time