Firefox Community Forum

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.

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 have noticed a weird scrolling bug in Firefox since either v138.0 or v138.0.1.

If you go to https://www.architecturaldesigns.com/ and select any floor plan, if you attempt to scroll down the page the page will not let you and snap back to the top.

I tried this in Firefox troubleshooting mode with all add-ons / themes disabled and encountered the same behavior. This is something that just started happening in the last version release or two.

This is present both on Windows as well as Mac versions of the Firefox browser.

Despite being listed as supported on: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices

enumerateDevices() still only returns input devices. Running navigator.mediaDevices.enumerateDevices().then(devices => console.log(devices)); in the Firefox console only shows input devices while on Chrome it shows output devices.

I use a website that supports playing from multiple output devices so when receiving a phone call, your desktop speakers and your headset can ring at the same time. This works in Chrome but it doesn't in Firefox.

When I open FF 137 on my iMac running OS 12.7.6, it just keep trying and trying with no link. When I try and quit it needs to be forced quick to stop running. There are no fire walls and it worked yesterday 4-5-25 just fine, but no go today. I tried replacing FF and still no luck, what do I try now, [email removed]@yahoo.com

For the past few weeks Firefox has been crashing and freezing often. Crashes are worst when trying to access Protonmail, which almost always crashes the tab instantly. Freezes happen most often when browsing Reddit, and also when watching Youtube, but crashes and freezes can happen on almost any website.

I have tried changing profiles, refreshing and uninstalling/reinstalling, but the problem persists and seems to be getting worse over time.

Here are some recent crash reports:

bp-3d92e88d-bdc6-4629-a869-899650250219 bp-c57e72ab-a6e5-47d4-abeb-d5ce90250219 bp-b66a1b94-6392-4fc7-a2d9-4b9ee0250219 bp-2544016d-d918-4027-9b0e-de75e0250219 bp-23ca9aa4-0934-4f23-b2e1-0390a0250219 bp-9ea6fa00-c531-428e-b276-ad3760250219 bp-4b4316fd-ccb3-4787-877b-50ed40250219 bp-fe9ecc18-35dd-4654-b0e9-45ce00250219 bp-5447133c-6fe3-43fd-800a-dbdf10250219 bp-bb92230d-09b1-4920-8cc9-355940250218 bp-a98b5c50-bddb-4693-9199-ecc500250218 bp-0089dc50-da47-4be2-8e72-0dc8f0250218 bp-57364330-d723-4f8d-85dc-f31250250218 bp-2dbcdad1-a7de-4835-ba86-335e20250218 bp-bc7ca88c-c9b2-453c-9774-537b40250218 bp-b98c0da6-12e5-4332-a6e2-4c8680250218 bp-c4e7ff86-5cc6-43d3-aac8-81ce90250218 bp-07fb322d-1f54-478f-8f2f-3db690250218 bp-9670fc71-d8d7-48db-805a-7e8a90250218 bp-862d4443-8773-48c8-a09d-de9780250218 bp-3a7354bc-3fec-44b2-a802-f54de0250218 bp-c6b3cfac-61e4-444e-88e3-02f220250218 bp-9fc98135-55df-4746-8fbd-dd5530250218 bp-422b8b89-a540-4cad-8c1c-d11a00250218

Will be grateful if someone can help me get to the bottom of this Thanks

I am trying to resolve an issue with my firefox browser for MAC OS. Everytime I close my screen to sleep and open it back up, the browser stays on time out mode. I have tried downloading the update, but it never seems to complete or fully initiate. I have gone to the mozilla website and downloading directly from there but the new download wont even let me log into my gmail.com using my biometrics. any ideas?

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 ?

Hello,

Hopefully this is something that can get answered quickly. These past few days I have not been able to use FireFox on my laptop.

It doesn't seem to be a wifi connection issue because other browsers work and other devices are connected just fine.

I also tried opening FireFox in the "troubleshoot" mode, but I am still receiving the same errors. I would appreciate any help I can get on this issue.

Below is a screenshot of the error I keep receiving.

Thanks,

- Samuel

Apparently Firefox updated overnight and now my New Tab Page, which had a ton of tiles on it that I'd pinned over the years is now completely blank, no tiles, no nothing (except the Firefox logo). If there were at least some blank tiles, I'd have something to work with, but when I say blank, that's exactly what I mean.

Is there any way to get back the tiles I had? Because none of the pages I've opened or searched so far has created a tile on the page.

Thanks.

Hi Team,

I’ve successfully built Firefox v135 from source on our internal development RISC-V64 platform running on Ubuntu 22.04 with GNOME 42.9 (Xorg & Wayland), Our RISC-V Development platform does include a GPU HW which support HW Acceleration for GNOME & other 3rd Apps (Supporting X & Wayland), and Work seamlessly without any issues.

The FireFox v135 Application (via ./mach run) starts up normally. But the major issue I'm observing is that Firefox browser is very slow and laggy, especially during search operations and video playback on YouTube I see a poor performance. Upon further check I found that the most of the work is getting done over the CPU and the utilization is quite high, which is causing the FireFox to perform poorly. I also did try to switching to "Use hardware acceleration when available" in the Mozilla FireFox Settings, but still there is no difference with or without this check and Mozilla FireFox browsing Experience is very poor.

Kindly do let me know how we can enhance and improve the overall performance of FireFox Browsing Experience on my RISC-V platform. Any Support and Help is highly appreciative!

Attached a Build Steps and Configuration used for building Mozilla FireFox v135 on my RISC-V64 platform, let us know if there is anything missed. Thank you!

**BUILD STEPS**

1. Clone the Firefox source (v135.0.1):

git clone --branch FIREFOX_135_0_1_RELEASE --single-branch --depth 1 https://github.com/mozilla-firefox/firefox.git cd firefox

2. Install required dependencies:

sudo apt-get update sudo apt-get install -y curl python3-dev libnspr4 libgtk-3-dev llvm-14 llvm-dev clang libclang-dev libx11-xcb-dev libevent-dev libdbus-glib-1-dev m4 libnspr4-dev meson

3. Install Rust:

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh source $HOME/.cargo/env

4. Install Python and Rust-related tools:

pip install --upgrade pip pip install uniffi-bindgen referencing==0.29.1 cargo install cbindgen

5. Apply the RISC-V compatibility patch:

patch -Np1 -i firefox-riscv64-hack.patch

6. Create the mozconfig file with custom build options:

ac_add_options --with-app-name=firefox ac_add_options --disable-release ac_add_options --enable-hardening ac_add_options --enable-rust-simd ac_add_options --enable-linker=bfd ac_add_options --disable-bootstrap ac_add_options --enable-official-branding ac_add_options --with-branding=browser/branding/official ac_add_options --enable-update-channel=release ac_add_options --with-unsigned-addon-scopes=app,system ac_add_options --allow-addon-sideload ac_add_options --enable-default-toolkit=cairo-gtk3-wayland ac_add_options --with-system-zlib ac_add_options --disable-strip ac_add_options --disable-install-strip ac_add_options --enable-system-ffi ac_add_options --with-system-libevent ac_add_options --with-system-nspr

1. ac_add_options --with-system-nss

ac_add_options --disable-updater ac_add_options --disable-tests ac_add_options --enable-alsa ac_add_options --without-wasm-sandboxed-libraries

7. Vendor Rust dependencies:

./mach vendor rust --ignore-modified

8. Upgrade Cairo from 1.16.0 to 1.18.4:

1. Extract and build Cairo 1.18.4

tar -xvf cairo-1.18.4.tar.xz cd cairo-1.18.4 mkdir build && cd build meson .. --prefix=/usr/local ninja sudo meson install

9. Build Firefox:

cd firefox ./mach build

Regards, Saiteja.

Recently Firefox has been hanging up more than usual, I did a double check on all drivers, updates, and virus protection. Normally things work fine but through the day I'll get the "Gah this tab has crashed. " Or the window will freeze and hitch up, sometimes having to be completely closed with task manager. Just wondering if this is something to do with firefox as a whole, my add-ons, or something I can fix with an easy reinstall.

I keep getting this message- With firefox I get this message: Close Firefox Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.

I have followed the instructions to resolve this, but none of them are working.