Firefox Community Forum

Recently I observed Firefox is consuming TOO MUCH of RAM on my PC. It is anywhere between 55 % & 65%. That’s too much! I’ve 12 GB of RAM.

Is this due to updating of FF? Btw, I did not install any Extensions. And if I close Firefox the RAM consumption comes down to around 33%.

I do have 12-14 open Tabs but I always had those open Tabs. Previously FF did not consume so much of memory. What could be the reasons for this heavy RAM consumption?

Is this being fixed? My maximized window will resize it self. I was on v149 or so, I upgraded to v158 and now my window will resize. v159 does not fix it. Is this known? being fixed? do I need to create a video?

I am trying to retrieve my passwords and bookmarks on my PC but every time I try to log in the program says "NOT RESPONDING ". I did manage to do it about a week ago but they have gone again.

windows 11 Firefox . Unable to close tabs on X button when multiple tabs are open. Occurs after sleep state. Solution is right click and then close each tab or close application.

안녕하세요

파이어 폭스를 애용하고 있는 한국인입니다

저는 최근 (약 2026년 10월 동안) 파이어 폭스를 사용할때 컴퓨터 팬 돌아가는 소리가 계속 들린다는 사실을 꺠달았습니다

작업관리자를 통해 확인해봤는데 제 컴퓨터에 설치된 램 64GB 중 34GB를 파이어 폭스가 사용하고 있다는 사실을 알게 되었습니다

확실하게 버그 같아 보이고 그 정도의 용량이 파이어 폭스에 필요한지 모르겠으나 만약 의도한 설정이 아니라면 꼭 고쳐주세요

사진을 첨부합니다 이 사진이 찍을 당시 파이어 폭스로 켜져있는것은 유튜브 창 두개 커뮤니티 창 하나 였습니다

감사합니다

Running Mac Sequoia 15.8.1 I launch Firefox, login to Amazon Prime and when I get to Amazon Prime Video page, Firefox freezes, won't respond at all, and play button shows a rotating circle (see attached). Firefox -does- play video on Youtube and other video websites. Safari on this same laptop plays Amazon Prime Video just fine. All other computers/browsers in my household utilize Firefox to play Amazon Prime Video just fine, so it's something out of whack on this MacBook pro. I have uninstalled and reinstalled Firefox several times with full reboots each time but to no avail. Please provide any other options.

My Macbook Air (M1, 2020) has be moving slowly recently. I wondered if how I'm using Firefox could be contributing. I typically have two Firefox browser windows open, with 5 or 6 tab groups each with several tabs.

In addition and more specifically, I'm wondering if closing (collapsing) a tab group means those tabs won't be contributing to my computer's CPU load. Thank you.

Hi. My Macbook Air (M1, 2020) has been performing slowly in recent days. I'm not playing video games or watching videos, just mostly working on many tabs in Firefox (157.0.1). I looked in my Mac's Activity Monitor, which shows that Firefox GPU Helper is using about 5.75 GB of memory. The next few highest users say "Firefox Isolated Web Content." Could any of these be what is slowing my Mac down? I'll attach a screenshot of my Activity Monitor. I also clicked "Share Data" below. I would say that my Macbook is working at a fine speed at the moment, so perhaps the screenshot and data are not so helpful. Let me know if I can add something later in a reply, when my Mac is moving slowly, that would be helpful. Thanks.

Firefox's performance keeps getting worse. I have to clear the startup cache several times a day just to get any sort of decent performance! Reinstalling hasn't helped, and disabling add-ons hasn't provided a solution either. Has anyone else experienced this, and/or does anyone have a solution to the problem?

I started noticing that Firefox was giving me a lot of "not responding" freezes the past couple of weeks. The past couple of days I basically cannot access Firefox at all - constant, immediate freezing. I have tried uninstalling/reinstalling (multiple times), disabling hardware acceleration, running troubleshooter mode (still freezes! if it opens at all!), deleting profiles, restarting my computer, etc. I've done just about everything I can find online about this issue. Nothing has worked. I have no issues with Chrome or Edge.

Any suggestions??

This morning, I can no longer download (Save) files to my computer, nor check/change settings in Firefox. Tried all troubleshooting steps to no avail.

If I delete and reinstall Firefox, will I lose all my Bookmarks, etc.? Running version 157.0 (aarch64).

Appreciate any help!