Форум спільноти Firefox

1. There used to be a choice in settings for Firefix mouse control to be optional. It is no longer available and apparently FF has created default mouse behavior.

The mouse behavior has become errant in a variety of ways. It interferes with everything online and started doing the same on the desktop.

The wheel is configured for three lines at a time on desktop. I do not want the mouse wheel to be doing anything else. I want either or both mouse buttons to open menus and function normally with links, copy and paste.

When looking in about:config the extensive number of configured mouse defaults is shocking. it is impossible to determine how to disable or delete any of them.

It has become impossible to scroll with the wheel and the scrollbar because the mouse jumps all over the page as if possessed.

It is impossible to scroll 3 lines at a time with the wheel, instead the mouse goes up and down and jumps to the top. Changing the number of scrolling lines on Desktop and in about: config so they are both 3 did not solve the problem. Tried changing both to 5 . . . no joy.

Expandable menus no longer open on some websites.

It has also become impossible to us the scrollbar effectively, instead the same behavior manifests as it does with the wheel - the mouse is jerky, going up and down and jumping to the top of the page, unpredictably.

Either way the mouse gets stuck moving up and down. After having successfully scrolled past where it was previously it returns, repeatedly, to the same previous lines each time I try to scroll further - in an endless loop.

If the mouse does functional, briefly, then half way down the page it starts misbehaving again. I already replaced the mouse several months back when the problem started, however, it was not constant. Then it started again with the new (usb) mouse. (Yes, I've cleaned it. No it is not worn out yet.)

2. Via a search I did find a list of adjustments to make in about:config while learning unexpected mouse behavior had become a common problem. I made at least 20 adjustments, and amazingly, there was no longer a problem! Smooth scrolling, no problems. However, after using the browser, closing and opening it numerous times, the errant behavior returned.

3. If there is no way to completely turn off FF mouse control, or use about:config to disable it entirely, then what is the last FF version that allowed saying "no" to what used to be optional mouse control, so it is possible to change back to it? If there is no other way to solve the problem, that should do it.

Any suggestions or solutions appreciated.

16 GB memory, 500 GB SSD. (chose to not install Windows 11 version 23 onward - so in the 22 gray zone that is both a windows 10 install and a windows 11 install - this is the windows 11 install).

Whenever I open a new firefox page externally, such as from the system tray or by opening a link from outside firefox, nothing happens for about five seconds and then it loads normally. When I open a new firefox page internally, such as from file ---> new window or by clicking a link within firefox, it loads instantly like normal. This has been happening since yesterday (3/13/26) evening.

I have already tried all of the following fixes and none have done anything:

Clearing firefox startup cache running firefox in troubleshoot mode running an older version of firefox disabling all my extensions disabling my antivirus disabling hardware acceleration disabling captive portal detection making sure both firefox and windows 11 are fully updated refreshing firefox reinstalling firefox rebooting my PC disabling IPv6 preventing accessibility devices from accessing my browser clearing my cookies

I rarely turn my laptop off, when I'm not using it I put it into sleep mode. Firefox absolutely hates this though, and after a few days it will slow to a torturous crawl. Everything becomes horribly irresponsive, feels like nails on a chalkboard. It can even get to the point where it will randomly delay my cursor in Windows 10 itself by 10 SECONDS along with some bleed into other programs while switching between them. Fully closing Firefox then re-opening it will reset the issue, starting the timer again, but I hate doing this because I have doing that set to log me out of various sites which I then have to re login to, letting the torture boil until I give in. This has been my Firefox experience on laptop for at least 5 years now. Other forks of Firefox have this same issue.

I am leaving Firefox in the torture state currently to troubleshoot here. Currently the memory usage on Firefox is 6GB at 54% of my total ram, which is being used at 84% total. Total CPU usage is 23%. Wrote this on my desktop for my sanity so that's why there's no troubleshooting information.

I use Brave, Firefox, Firefox Developer Edition and Thunderbird. Brave: 600mb Firefox Dev: 600mb Thunderbird: 200mb Firefox: 800mb Why is Firefox using too much memory? Especially as I am running Firefox Dev as a direct comparison. I don't have any plugins on Firefox. Firefox Dev has uBlock Origin alone. Brave has a few plugins.

Recently I've had this issue (on reddit) where after I expand a video in the feed, and start scrolling, all the visuals freeze.

I know it's only the visuals, because I can still interact with the website (usually unexpand the video, or pause it) with the image still frozen and audio still playing.

I can fix it by tabbing firefox down, and then up again. While researching I found the profiler, and finally managed to capture the moment it happened.

I'm no stranger to technical stuff but it's a loooot of data to process, I did a "clean" profile recording as well where I did the same action and where it didn't freeze, and I can't really make heads or tails out of what the issue is.

The recording managed to capture the phenomenon and I only clicked twice during that period, to expand two reddit expando videos, the second one is what caused the issue when scrolling. The only thing I see is a spike in memory usage

Not sure if I can (or should) upload the profile recording here or what, but it's been bugging me a lot.

It's pretty tricky to replicate because it seems to be random when and what triggers it, even expanding the same videos doesn't replicate it. Sometimes I go days without it happening, sometimes it happens 6 times in a single session.

I've added some screenshots of various views of the profiler/stack data.

I have an Nvidia RTX 5070ti GPU, hardware acceleration is on, AMD Ryzen 7 9800X3D processor.

I think I might have enabled some rendering settings in about:config, maybe it's related to that but I don't remember exactly what.

Maybe it's due to some windows "game optimisation" or the GPU and CPU-GPU fighting?

I have no problems watching videos while playing games or anything though.

Hi Everyone,

I’m Harmandeep Singh Kandhari from India, A Health and Wellness Motivator and Now, Recently, my Mozilla Firefox browser has started using much more memory than usual, and multiple tabs cause noticeable slowdowns. I haven’t installed many new extensions. What steps can I take to identify the cause and optimize Firefox performance without resetting my entire browser profile? 🦊💻

Thanks, Harmandeep Singh Kandhari

For the past 15-16 days, Firefox has been consuming extremely high memory.

The problem: - When Firefox first opens, it starts normally at around 300-400 MB - But after using it for about 1 hour, a single Firefox window grows to 1-2 GB of RAM - This keeps increasing the longer I use it (memory leak behavior) - Currently Firefox (41 processes) is using over 5,131 MB total memory on my system it's normal but after 1 hour a single firefox window grows to 1-2 GB of RAM

What I have tried: - The issue happens consistently every day for the past 15-16 days - Other browsers like Chrome and Chromium use much less memory in comparison

System info: - OS: Windows 11 - Firefox version: latest version 148.0.0.0

Please help me fix this memory leak issue. It is making my system very slow.