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Hi everyone,

I’ve been experiencing performance issues while using Mozilla Firefox, especially when working with browser-based tools that handle file processing.

When I try to upload or process larger files (like PDFs), I notice the following:

• Firefox becomes slow or laggy • The tab sometimes freezes temporarily • File processing either takes too long or doesn’t complete • Occasionally I get a “page unresponsive” message

For testing, I used an online tool: [ONLINE EDITOR]

The issue seems more noticeable with larger files or when multiple tabs are open.

What I’ve tried:

• Restarting Firefox • Clearing cache and cookies • Disabling extensions • Testing in Troubleshoot Mode • Updating Firefox to the latest version

The same tasks seem to work slightly better in other browsers, so I’m wondering if this is related to Firefox performance or settings.

Question:

Is there any way to improve Firefox performance for heavy browser-based tasks like file processing? Are there specific settings I should adjust?

Thanks in advance!

is there a way to revert the changes that have been made on ver 149 regarding the scrolling? I'm trying to scroll some really long sites and when I just touch either my magic mouse or my macbook trackpad scrolling jumps to the end. Up to version 148.02 there was no problem. I've check it on 2 machines with macos sequoia and the problem is valid.

Hello all,

I've been a long time Firefox user and recently (starting about 2 months ago) started seeing some irritating behavior while browsing. Firefox will at random intervals "gray out" either while interacting with specific webpage elements, or browsing specific websites. An example of this "gray out" condition is included as a screenshot. The browser will flicker between this "gray out" condition and the webpage, occasionally staying in the "gray out" state for 3-6 seconds. As you can see in the screenshot all Firefox UI elements are also missing, so this seems to be broader application issue. I've noticed this particular issue repeatedly on Amazon.com while moused over product photos.

I consider myself a power user. As for my PC, it is running Windows 10. All graphics drivers are up to date. Other apps run normally. I've never had any problem browsing/interacting with similar web content in Microsoft Edge... but I heavily prefer to use FireFox. Has anyone else encountered an issue like this?

I've just now noticed that whenever I open the website hxxps://www.hex-rays.com it will hang without finishing loading for a couple of seconds, then the entire browser will freeze. I've already tried on a new profile, verified that no addons or plugins are installed there, and no DLLs hooked into the process. This happens on my physical PC and in an (almost unused) VM, with an ancient version 134.0 and the latest 149.0.

Can anyone else replicate this? Should I create a bug report?

For the last couple of days, the Firefox instance goes black and the title bar turns to an old windows look (see picture). Or turns fully blue, the color of browser theme, and the title bar is covered as well. There is no certain page that makes this bug appear, it appears randomly regardless of the page I'm visiting. Often it happens on the Firefox instance that is on the monitor I'm not working on at that moment. For example, I am browsing on my main monitor, and the 2nd monitor has a page open, the page in the 2nd monitor becomes bugged. It happens the other way too. Current Firefox version is 149.0 64 bit version, but i think it happened before the update too. I have already tried to turn hardware acceleration on and off again.

When I navigate through multiple pages on the phone, especially when the connection quality is not very good, the whole app sometimes stop loading anything.

1. Open multiple pages or SPA that would frequently make XHR requests during usage (like X/Twitter) 2. Navigate though those pages, make actions that is definitely going to initiate new http requests 3. Repeat until some contents staying in load progress 4. You'll get blank page if you open new page from now on 5. Killing the process (in app details) would reset this behavior.

Feels like there is a connection or worker thread pool that is running out of available resources.

Hi. Recently, a old issue has comeback on my firefox. When I load youtube video, or a twitch livestream, at 60FPS, and I scroll down the page, the scroll "lags" until the player is off screen. By lags i mean it slows down the scroll and is no longer smooth. This is an issue I've had before and had successfully dealt with by accessing about:config and turning media vp9 off, but it has returned fairly recently, since I do not remember this issue happening before the last week, maybe two. Another issue, also on youtube, is that when I scroll down through shorts, sometimes after a couple of videos, the browser will visually freeze entirely, but will still allow me to click things on the page and also play sounds. After about 20 or so seconds, it will unfreeze and work normally.

I understand that this issue, atleast the 60fps scroll lag, has been an issue for a while and I have tried multiple fixes for it, changing various boolean settings, refreshing firefox, updating my Nvidia drivers to the newest via nvidia app which i should add has never been an issue for the past few months and has worked flawlessly and my nighmarish evening of troubleshooting ended with me completely fully uninstalling firefox and redownloading fresh, but the issue presists.

It should be noted that on other browsers, I have no such issue. Im not sure if mentioning this is some sort of taboo or persona non grata, but i also downloaded and tested Waterfox, and it also does not have this issue. The only band aid fix I found for the moment is that turning off Hardware Acceleration fixes the scroll issue, but it causes awful screen tearing, which is just as bad and distracting.

So to my understanding, 3 potential things are happening. This issue is just in my head Something on my pc is dying and I have a mechanical or software problem Or finally, there is some issue with a recent update, either with firefox or maybe some driver somewhere causing an issue. It just upsets me greatly due to this being a relatively new issue. As stated I have dealt with the scroll lag before and did find a permanent fix, and firefox has since worked literally flawlessly for months/years. But now, somewhere within the last week, maybe 2, something has gone wrong. I hope this gets fixed in an update, or if others have this problem there is a fix. Thank you.

i am using honor magicpad2 today there is non sync with my keyboard and mozilla.looking for update but none .my keyboard was working well but not i cant see what i wrote .everything comes later.thanks.

Latest version(s) of Firefox on my Android 16 Samsung Galaxy 25 Ultra are not happy - go to open a new tab and the entire app freezes - after about 10s I get offered the option of waiting - which does nothing, the same message reappears again 10s later - or closing the app.

Have been trying to find resolution as Firefox is my browser of choice but nothing so far besides reverting to an old build of around 140 and refusing to upgrade.

Please can this be looked at as a priority - reading up I believe a number of Samsung users are experiencing problems with the newer versions all focussed around the tab system.

Hi, I use a website called Slickdeals which has a lot of thumbnail photos showing the product on the homepage.

Firefox seems to have a problem with it where Chrome does not.

Scrolling fast throws it off...the screen turns white and I have to wait for the images to load. Also, the scrolling tends to get choppy while using my touchpad scroll.

I've tried disabling hardware acceleration, disabling smooth scrolling, and clearing cache/history.

Sometimes the cursor lags about a second from the arrow to the hand pointer on links to click.

I have fast FIOS internet and a laptop with 16 GB RAM.

Thanks!

I've just upgraded to V149 and, when using NordVPN, Firefox is now taking at least 30secs to startup. If NordVPN is off startup is instant. Prior to V149, Firefox startup was instant, both with and without NordVPN.

After updated to 149. Tab unloader is totally broken, unloaded tabs won't be discard but hold in shared web processes then reload right away. Extension process ram consumption bloated then cause browser lost response. If it not a hard hung up it would stop loading data from web. And/Or not operate when switch tab. Every action is risking frozen only way to unfreeze is to kill the extension process while risking complete lost of response. Never seen such piece of shit in decades.

When playing YouTube videos in Firefox, the video constantly hangs or freezes. I have to restart the browser to continue playback. This happens every time I try to watch videos on youtube. what is going on?

Why I am receiving regular message from web page "https://fno.5paisa.com/open-interest/oi-dashboard?name=HINDALCO&exch=N&exchtype=D" that this page is slowing firefox, stop it ?

Hi, I notice today that Firefox takes a really long time (~30s) to start. The main Firefox frame opens, totally empty, no tabs, nothing... and ~30s after, it starts.

I also notice that it is linked whith the VPN. When the VPN is active : long time, when the VPN is paused, normal start.

I have two computers, same reaction ! The first computer is used every day, so I have the problem on this one since the last update (I suppose).

The second computer has not been used for a week. I started the second computer today , I checked the VPN is active, I notice the first use of Firefox (which was still v148...) was as fast as usual, then Firefox automatically updets to 149.. and restart, and then, same behavior : long time as start.

I tried to go back to version 148, without any better results.

Can you help me please?

Two computer are in W11 up to date, and the VPN is NorthVPN up to date

Regards Alain

I have a problem: when I open any Instagram reels link like from google , facebook , forum , etc https://www.instagram.com/reels/****/ the browser freezes. After a bit, a “stop” message shows up. When I click it, it opens a blank page like the one in the screenshots, and the tab completely freezes — I can’t go back, forward, or even close it. Even if I close the browser, it keeps running in the background. There are no extensions enabled (I’m using troubleshoot mode). windows 10 64

I am on arch linux, Wayland KDE Plasma. KDE Plasma Version: 6.6.3 KDE Frameworks Version: 6.24.0 Qt Version: 6.10.2 Kernel Version: 6.19.9-arch1-1 (64-bit) I then ran firefox (Both Flatpak and Pacman fail ), and no matter what (MOZ_ENABLE_WAYLAND on or off) when in pointer lock, the high polling rate mouse was significantly slower than the lower polling rate touchpad. I have tried different mice with high polling rate, the result is the same. https://mdn.github.io/dom-examples/pointer-lock/

When doing anything that requires momentarily leaving browser focus, such as hopping to an authentication app or email or text to receive a 2 factor authentication code, the browser will refresh the current page every time I hop back to Firefox.

This usually causes in most cases the code I left to retrieve to become expired as it now wants a new one when the page refreshes. In most cases this also wipes out the entire content of forms that I have taken time filling in. This can happen any time the app loses focus, even if somebody just phones me and I don't even volunterily leave the app.