Firefox Community Forum

When I recently upgraded to Mac OS Golden Gate on my MacBook Air (with M1 processor), everything became VERY slow and glitchy. Very akin to days of Dial Up. Apple tech support stated this is an issue with Mozilla Firefox.

Please reach out and provide solutions. I have already cleared cookies and data from Firefox with very little benefit.

Please provide clear steps I can follow as I do not have a strong tech background.

Thank you

Summary While Gemini Deep Research was researching a topic and building a PDF report, Firefox's memory and CPU use shot up and the whole laptop became sluggish. System RAM reached 12 of 13 GB. It came back to normal on its own after the report finished.

What I did 1. Opened gemini.google.com in Firefox. 2. Asked Gemini to research a topic and create a PDF (Deep Research). 3. While the report was being generated, the system slowed down badly.

What I measured - Firefox held about **2.6 GB of GPU (GTT) memory**, which comes out of system RAM on an integrated GPU, and it ran at about **100% CPU**. - Total GPU GTT memory in use reached **5.3 to 6.7 GB**, while normal process memory (RSS) added up to only about 5.4 GB. - System RAM reached about **12 of 13 GB in use**, and the system started swapping. - After the report finished, GTT use dropped to about **0.2 GB** and free RAM went back to about 3.8 GB. - Measured from `/sys/class/drm/card1/device/mem_info_gtt_used` and `drm-memory-gtt` in `/proc/<pid>/fdinfo`.

System - Laptop: Lenovo V15 G4 ABP - CPU/GPU: AMD Ryzen 7 7730U with integrated Radeon graphics (2 GB reserved as VRAM, 16 GB RAM in total) - OS: Ubuntu 26.04.1 LTS, kernel 7.0.0-43, GNOME 50.1 on Wayland - Browser: Firefox 159.0.1 (Flatpak)

Questions 1. Is this expected for Deep Research, or is it a known issue? 2. Is there a setting or workaround (for example turning off hardware acceleration, or switching away from the tab while it generates) that reduces memory use? 3. Has anyone seen the same thing in Chrome, or on other integrated GPUs?

Thanks!

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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?

My browser is using 2,3 Gb of extra ram it goes away by restarting but comes back in 5-10 min. It occurs wathing twich, i have tried disabling extentsions but it doesn't work. in about:memory the readout is as thoug it is keaping an extra copy of open browser files in ram.

2,511.83 MB (100.0%) -- heap ├──2,301.00 MB (91.61%) -- committed │ ├──2,016.65 MB (80.29%) ── unused-pages/dirty │ ├────230.75 MB (09.19%) ── allocated │ ├─────32.96 MB (01.31%) ++ bin-unused │ └─────20.65 MB (00.82%) ++ (2 tiny) └────210.82 MB (08.39%) -- decommitted

    ├──210.21 MB (08.37%) ── unmapped
    └────0.61 MB (00.02%) ++ unused-pages

Hi, I often use a two finger 'flick' to scroll and firefox is not allowing me to stop the momentum.

Other browsers work just fine.

Anyone else experiencing this?

Thanks!

Gentlemen, isn't your browser using a lot of RAM? I've been freaking out about it in recent years. That's only with 25 tabs open!! Despite the fact that the system was installed just a day ago, without any tweaks!!!

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?

Hello ! I'm confronted to a very weird behavior of Firefox, on Ubuntu 24.04.

When I'm clicking on a link in a mail of pdf document, the page opens in Firefox, I can navigate and click in it but when I try to type something (for instance to enter my id to connect), the keyboard does not consider I'm in Firefox but still in the previous application (Thunderbird etc). To be able to type something in Firefox, I need to go back to another window (alt tab) then go back to Firefox manually...

This also occurs if Firefox hides the other application on the screen. Note that from the colors of the windows (the tone of grey), I looks like that Firefox is the active window and no longer Thunderbird.

I tried to summary this in the following image.

I've been trying to get the browser toolbox window to work correctly for a couple of days now and I can't figure out what's going on. When I invoke the toolbox window with the shortcut key or through the menu entry the window pops up and asks for permission to connect (I click 'ok' in this box) but the window gets stuck before loading the toolbox ui, screenshot of what I'm seeing is attached.

I'm on windows 11 pro 25h2 and firefox 159.0.

I should note that this is the same behavior in a clean temp profile in firefox, as well as the same behavior in other firefox based browser, such as librewolf.

Does anyone here know what I can do to get this working?

Thanks for any help and let me know if you need any other info.

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My macOS golden gate 27.2 restarted without permission while I was away. Admittedly I had a lot of tabs open. When I restarted Firefox (159.0), it appeared to have lost the active tabs but restored the minimized ones. But when I selected each of them, they started to expand and then vanished. The restore previous session and recently closed tabs/windows options were greyed out. I tried restarting Firefox and the whole laptop, and it returned to the same state. HOWEVER, right clicking the Firefox icon provides a list of windows, and clicking “show all windows” displays the windows I had open, so it looks like they’re not entirely lost? When I select a window it does everything to look like it’s going to open- including greying out another application open behind it- but it just doesn’t open. Interestingly pressing “more troubleshooting information” or “new tab” seems to open a new tab in the existing window in “show all windows”.

I also tried this article: https://support.mozilla.org/en-US/kb/how-restore-browsing-session-backup No noticeable effect, I think the earliest backup was made too late.