Diễn đàn hỗ trợ Firefox

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.

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 run Firefox on Win11. When i go to a website, and open several tabs, e.g., 10 or more, firefox just sits there and no longer works on that site. Basically Firefox is becoming quite worthless as a browser for me. The reason i use it are the extensions. This is something that has happened within the last 6 to 9months or so. What is going on. Is there now some limitation of how many tabs you can open? The site with this problem is: https://www.bellazon.com/main

Anyone got any ideas as to what is going on here?

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?

在 Firefox 内部：

通过 JS 触发的新页面 通过 a.click 触发的新页面 甚至 rel=noopener 都会被标记为：

“related browsing context”

进而共享同一个进程，新页签因为内存占用过高，导致旧页签卡死。

通过设置

1. 添加 COOP 响应头 add_header Cross-Origin-Opener-Policy "same-origin" always;也无法解决

设置空白页再重定向也无法解决

2026Feb24

Dear Mozilla,

I use Firefox as my primary web browser.

I am constantly having to Force Quit Firefox in order to free up storage.

Please work on making Firefox handle storage better.

App is unusable. Freezes up frequently. Tried downloading again. Same problem. I am using Chrome temporarily and it is working just fine. Also ran Safari, no problem. Used it to download ESR 115. Worked fine. Definitely a Firefox problem.

Please view screen captures that best show the random issues I have with Firefox browser. This started a few months ago on my desk top PC. I have kept my Firefox up to date using 147.0.1. and still run WIN 10 Home. Although I am sure Linux is in my future!

The issue happens randomly where the top row of my browser disappears off my screen. I can work around the issue no problem but would like to know and understand the issue and if I can resolve it from happening. Firefox is the only app I have this issue with. And it is random and cannot be forced, I have tried....

Thank you for help. John Montani

My firefox broswer is starting super slow since the last update. I am on a windows 10 lap top running McAfee anti virus software.

In my task manager there are multiple firefox icons running. See the attached screen shots.

I copied one of the crash report into the note section below.

If any one know show to correct this slow start up pleas let me know.

Thank you Dale

Since I installed Firefox, every software program, webpage, document, email and new tab freezes for up to five minutes. I can't get anything done. Please help! I tried the suggested steps but nothing works. I am not happy with Firefox at all.

My Firefox for multiple profiles. After opening one and downloading emails it freezes after a minute or two. I have been using Firefox for years, I am using it on a desktop Windows 11 Pro- version 140.60esr. I have donated to Firefox for a number of years. I have gone into the profile and deleted the extension .msf. It did not correct the problem is still freezes. How can I fix the problem. Many thanks.

Greetings. Am running Firefox 147.0.4 (aarch64) on a MacBookPro running Mac OS Tahoe 26.3. When I first launch Firefox, it sits and does nothing for 30 to 45 seconds, I have it set to open a National Weather Service forecast page at startup, but even if I try to type in a different URL, Firefox won't allow me to do anything --or even quit the application -- until that first web page finally loads. Have tried clearing all history, including cookies and site data, but that does not help. The hangup was even longer until I worked with Apple tech support to turn off some universal add-ins like Content Barrier (Intego) or anything that acted like a VPN. Apple told me the hang is apparently caused by a Firefox add-in or extension. But I can't figure out how to find any or how to turn it off.

Bogged down, slow: Win11 task manager(TM) shows more FF browsers than reality. Have 11 FF browsers in use but TM says 55 climbing to 77.... numbers vary up & down! but never accurate to what is in use. Attempted fixes: cleared cookies, ' Refresh', uninstall/reinstall. Troubleshooting Information: Application Basics said "Profile folder" click "Open Profile' for FF ...but no FF in that list. Tried 'clear Startup cache' and it jumped to 82 after... so worse. How do I get a true number of browsers open and not these 'extras'. Thanks in advance..

I’ve encountered a problem with Firefox that it fills up the RAM memory to the brim (12Gb) and especially when you’re on Facebook, it doesn’t empty the RAM memory but the data remains, you have to close Firefox and lose your web page, it just fills up, Why, should it be like this, very annoying!!!? :flushed_face: //A-B/Sweden

Lately when I reconnect to my Mac laptop after a period of sleep, the Firefox browser windows are unresponsive. It seems to be receiving input but does not update the display. I have to quit and reopen Firefox to get it to work again. The menu works, I am able to quit, so it's not like the whole app is frozen. Plus, if I clicked on the "new tab" icon while it was unresponsive, those new tabs show up open after I quit and reopen the browser.

YouTube playback freezes for a second or two every few minutes.

I have a recording with the Profiler that includes the stutter. It shows a memory drop and some "jank - event processing delay" just before the stutter happens 1m52s in: https://share.firefox.dev/4rzMNyD

My system: Firefox 147.0.3 (64-bit) Win 11 Home, version 25H2, OS build 26200.7840 Processor: 12th Gen Intel Core i5-12450H Graphics: NVIDIA geForce RTX 4060 Laptop GPU

The browser is very slow when opening a new tab... When I've opened Youtube it says that the Page is slowing down the browser and it takes a very long time to respond... I'm using MacOs Monterey 12.7.6 and I believe my Firefox is up to date

I've disabled extensions, changed settings, and reinstalled multiple times, but Firefox won't quit stuttering constantly. Other browsers work fine on my computer, and Firefox doesn't seem to be using much memory.