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I have a HUGE problem with Firefox memory usage. Some open instances of firefox are taking anywhere from 600mb to 2.8gb of memory. Since firefox opens MANY instances even with only ONE active window, this very quickly uses all available memory (4gb) causing a full laptop crash.

More concerning is that CLOSING the worst instance of memory usage STILL leaves the single open page/tab open, so what exactly was the memory eating instance actually doing ???

I have included a screengrab of the many remaining instances of firefox in windows task manager AFTER closing the main culprit.

I have also included a screengrab of all the adblockers I use which I believed would limit unnecessary memory usage, but does not seem to be effective.

Many Thanks

Please assist or advise why Firefox seems to be slowing down my system by memory usage. I have a handful (6) of tabs open on 1 browser session and my system started slowing down so I checked my task manager and it shows that I have more than a dozen of Firefox instances open chewing up almost 90% of my memory.

Please assist or advise me on how to tweak my browser to perform better, and not to show ghost instances

I'm tired of trying to find a solution to this problem, you're deaf!

I have been using Firefox since 2003. to avoid writing unnecessary words, I will simply state, I will leave firefox if you do not eliminate this problem:

firefox eats up all the RAM on my Mac. It is none of your business whether I open 1 tab or 10 tabs, give me the ability to limit the memory used by firefox, otherwise it eats up all the computer's memory.

I’ve noticed that Firefox consumes a lot of memory, especially when I have multiple tabs open. Sometimes, it slows down my entire system, and Task Manager shows Firefox using over 1GB of RAM even with just a few tabs. Other browsers like Chrome or Edge seem to handle memory better with the same number of tabs.

I’ve tried restarting Firefox, closing unused tabs, and disabling a few extensions, but the problem keeps coming back. I even checked techsquest.com for tips, but I’m still struggling. Are there specific settings, hidden features, or optimizations I can apply to reduce Firefox’s memory usage without sacrificing performance?

Here’s what I’ve already checked:

Firefox is updated to the latest version.

No unusual extensions running (just uBlock Origin and Dark Reader).

Hardware acceleration is enabled.

Any help would be appreciated—thanks in advance!

I have two Firefox tabs open on my browser. Task manager shows 35 tabs using 897 MB of memory. How do I make this stop? And why are so many tabs running? I have cleared cache, cookies, etc.

I am a heavy Firefox user, and have been using it (and its predecessor) since Netscape. In the last year, the size of my Firefox profile has more than doubled, from 500MB to 1.3GB. What's the probable cause(s), and what can I do about it?

Have any of you noticed how much resources Firefox use? Task Manager tells me Firefox requires 11 to function using 700 megs of memory. I have 32 megs on board and if I run auto-clicker on Firefox my fan needs to run to cool the processor... This doesn't happen on Chrome. Firefox is my browser of choice... (add-ons)

For some weeks I have ad an issue with Firefox using 50%-100% of CPU. Normally it is the Firefox process itself, sometimes it is also "Privileged Cont".

OS is Kubuntu 24.04. Firefox has done this across 2-3 versions.

Things I have tried:

Restarting Firefox No change, I'll even get 100% cpu usage with no tabs open

Refresh Firefox to remove settings and addons No change

Uninstall Snap and try direct Apt package No change

Remove ~/.mozilla to fully remove any residual settings/cache/etc No change

Try with and without hardware acceleration See: https://support.mozilla.org/en-US/questions/1308215 No change!

I would blame my old computer hardware, but Brave runs fine. I am now using Brave, but would dearly like to return to Firefox as I miss containers, and I don't support a chromium dominated web.

Version 133 Android pie. Unauthorized background data usage even when set to denied. System is set to deny background data usage, no exception yet firefox using data. Hate to put firefox on firewall's deny list. Is the future of firefox releases.

Long time firefox user and supporter

Hello Team,

I'm working on building Mozilla FireFox on my riscv64 development platform on Ubuntu-22.04, Below is the source and branch from where i'm using the sources.

https://github.com/mozilla-firefox/firefox.git (Branch: FIREFOX_139_0b10_RELEASE)

I'm following the below steps for build firefox:

Created a mozconfig file with the following contents:

mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir mk_add_options AUTOCLOBBER=1

ac_add_options --enable-application=browser ac_add_options --disable-debug ac_add_options --enable-optimize ac_add_options --disable-tests ac_add_options --without-wasm-sandboxed-libraries

Installed dependencies:

apt-get install -y python3-dev curl curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh pip install -U pip ./mach bootstrap cargo install cbindgen apt-get install -y nodejs apt-get install -y llvm-14 llvm-dev clang libclang-dev libpango1.0-dev libx11-xcb-dev libxcomposite-dev libxdamage-dev libgtk-3-dev

Configured the build:

./mach configure

During the build, I encountered an error with Cairo version 1.16.0, so I updated Cairo to the latest version by doing the following:

tar -xvf cairo-1.18.4.tar.xz apt-get install -y meson mkdir build && cd build pip3 install --upgrade meson meson .. --prefix=/usr/local ninja sudo ninja install pkg-config --modversion cairo

After which I executed build:

./mach build

The build took ~14 hours and reached this step:

892:50.50 Compiling gkrust v0.1.0 (/root/firefox/toolkit/library/rust)

However, after about 30 hours, I ran into an Out of Memory issue. I am using a 64GB SD card for the build and have created a 10GB of swap space within the 64GB, but still encountered this error:

[189659.052881] Out of memory: Killed process 52440 (rustc) total-vm:14996824kB, anon-rss:5113116kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtab0 2811:13.62 error: could not compile gkrust (lib) 2811:14.39 Caused by: 2811:14.50 process didn't exit successfully: `/root/.rustup/toolchains/stable-riscv64gc-unknown-linux-gnu/bin/rustc --crate-name gkrust --e) 2813:03.10 gmake[4]: *** force-cargo-library-build Error 101 2813:03.15 gmake[3]: *** toolkit/library/rust/target-objects Error 2 2813:03.44 gmake[2]: *** compile Error 2 2813:03.70 gmake[1]: *** default Error 2 2813:03.90 gmake: *** [client.mk:60: build] Error 2 2813:04.19 W 271 compiler warnings present.

Could you please help me troubleshoot or suggest how to resolve the memory issue?

Any help & support is greatly appreciated!

Regards, saiteja

Lately, I’ve noticed Firefox consuming more RAM, especially with multiple tabs open. Is this a common issue in recent updates? What are some tips to optimize Firefox performance on lower-end PCs? Would love to hear your experiences!

Power consumption of Firefox is so high that it nearly killed the display of my iMac. My screen started flickering with horizontal lines across the display. When i touched the screen, it was so hot that I could boil water using it. I did not realize that it was Firefox that was killing my PC until I looked at the power consumption (see the attached screenshot). I hope there is a solution to this since I really love Firefox and have been using it for well over a decade.

I've noticed my GPU fan runs heavily as soon as I open Firefox, and with even just only one browser page open, it runs high speed, where it didn't use to do this. How can I get Firefox from requiring so much of my power. I don't want my electric bill higher just because of a browser. I have a decent GPU good for gaming quality that usually doesn't get clocked enough to cause the fan to turn on and run at high speed unless it's a high-graphics computer game or something. Anything I can do to make the browser demand less on my GPU?

i noticed that my laptop is getting too hot, when i opened task manger i found that Firefox is using a lot of ressources every time, i have a decent ram of 24GB and i7 7th gen plus an gtx1050, i don't think it's my work flow because i've been always using too much tabs without any problem, i suspect an update issue, what do you think ?

I have been using Firefox for many years now and I have always been greatly satisfied with its stability, performance and features. However with the last couple of releases something has changed. The number of tabs I keep open and what they are connected to have changed very little over the years. The CPU utilization has never been much but now it has become huge - utilizing multiple CPU cores and running them at 100% whether I am using the browser or not. I have gone thru each individual tab/web page removing it, waiting for a period of time and them re-adding it assuming this was a website coding issue. Nothing changed. So I gave up and move 98% of my web browsing to another browser (Opera) - moving one website at a time until what was left on Firefox was 11 tabs. Finally the CPU utilization went away. I got the latest Firefox version update today, installed it and now Firefox has changed behavior yet again. Those same 11 tabs will not use any CPU as long as I keep Firefox open and visible on screen, but if I minimize the Firefox window it immediately jumps up in CPU utilization. This makes no sense to me.

What adds to all this frustration is I am running on a system76 Thelio desktop. While extremely fast they have a known issue with their somewhat loud CPU cooling fan kicking in too fast when high CPU utilization occurs. Firefox never used to cause the fans to run but now the latest couple of versions cause the fan to run continuously.

Here is a paste from "top" showing the top 2 cpu processes - both from Firefox and the browser is minimized:

416154 greeves   20   0 3796844 612012 260196 R 109.6   0.9 147:49.17 firefox-bin                             
416394 greeves   20   0 3537408 822456 130500 R  89.7   1.3 146:40.46 Web Content 

 My apologies if I have run on with too much info that is of no help.  If anyone has any ideas it would be appreciated and I would be happy to test.  FYI, my OS is up to date, Firefox is up to date, BIOS is up to date, I have restarted Firefox many times and I have rebooted several times.  I thought Mint might be the issue so I loaded Pop-Os and tried it with the same results.  Btw neither Opera or Brave shows the problem.  However I would prefer to use Firefox as I really like the features - especially how it handles tabs and grouping them.

Thanks in advance for any help!

Hi, after update 137.0.1 (64-bit) using Firefox with latest Gecko driver 0.36.0 in Python Selenium stalls and fails to initiate drivers without returning initiation errors every second launch, previously this stall without returning initiation errors would happen every ~25th launch. Also when it does successfully launches previously 9 instances used to use about 95% of my 8 GB RAM, now 6 instances use 100% RAM. Nothing else in my system changed besides Firefox update.

I believe this problem began in 133. I've noticed that if FF is open for a few hours, it starts to develop a very noticeable input lag. For example, if I'm watching a YouTube video and hit an arrow key to advance the video, there will be a couple of seconds before the browser registers the key press. It behaves like a high CPU issue but I do not detect high CPU usage when this is happening. Restarting the browser resolves the issue for a few hours.

This is happening on Windows 11 as well as on a Mac running Sonoma.