Firefox Community Forum

Hi,

I’ve recently noticed that after a Firefox update, the browser has become very slow and unresponsive whenever I open multiple tabs, around 5–10. Before this update, I could open many tabs without any noticeable lag.

Now, new tabs take a long time to load, scrolling within open tabs feels choppy, and sometimes Firefox freezes for a few seconds before responding again.

I’ve already tried restarting Firefox, disabling extensions one by one, and clearing the cache, but none of these steps have improved the performance. I’m using Windows 10 and the latest version of Firefox.

Could anyone suggest what settings or troubleshooting steps I can try to fix this slowdown?

Since I installed Firefox, every software program, webpage, document, email and new tab freezes for up to five minutes. I can't get anything done. Please help! I tried the suggested steps but nothing works. I am not happy with Firefox at all.

When I wake up Firefox from sleep overnight, it is unresponsive until I force quit. I am on v147.0.4 on my M4 Mac Mini. It doesn't happen in shorter sleep periods. I can click something in it and then when I switch to another app, it responds. But the browser on normal interactions won't respond at all.

2026Feb24

Dear Mozilla,

I use Firefox as my primary web browser.

I am constantly having to Force Quit Firefox in order to free up storage.

Please work on making Firefox handle storage better.

I always have multiple tabs open in my browser. Previously, I could easily open (and switch between) 20+ tabs (I have 16GB of RAM). Recently, after opening five tabs, the Task Manager shows 10-11GB of RAM (88-90%) in use! How can this be? I cleared the cache and history, but it didn't help. I installed several RAM cleaners, but none freed up the required amount. None of the five programs worked. Where does that 15GB of RAM go when I open Firefox? When will you finally implement something like Google Chrome—they free up RAM for active pages when inactive ones are opened. Maybe it's because I have so many inactive tabs that the RAM is disappearing? But I had just as many tabs before, some of them inactive, and fewer than 20 active ones, so I could easily open another 20. And now I can't even open five new ones. What's happening to the browser?! SOS!

Firefox 147.0.4 (aarch64) "hangs" for 30 seconds to 1 minute when I launch it on my MacBookPro (OS Tahoe.26.3). Itwon't open the simple web page I have Firefox set to open when it launches -- and I can't navigate to any other web pages. When I try to interrupt, I get an Apple spinning beach ball until finally, Firefox opens that first page.

After working with Apple tech support, I have disabled a number of content barrier Extensions in Firefox-- which Apple tech support felt might have been causing this behavior. Nothing works. And I hesitate to run Firefox without some of them.

I tried deleting my Firefox user profile from my computer, but all that did was prevent Firefox from opening at all.

How can I stop this?

[edited email from community support forum]

I’ve encountered a problem with Firefox that it fills up the RAM memory to the brim (12Gb) and especially when you’re on Facebook, it doesn’t empty the RAM memory but the data remains, you have to close Firefox and lose your web page, it just fills up, Why, should it be like this, very annoying!!!? :flushed_face: //A-B/Sweden

YouTube playback freezes for a second or two every few minutes.

I have a recording with the Profiler that includes the stutter. It shows a memory drop and some "jank - event processing delay" just before the stutter happens 1m52s in: https://share.firefox.dev/4rzMNyD

My system: Firefox 147.0.3 (64-bit) Win 11 Home, version 25H2, OS build 26200.7840 Processor: 12th Gen Intel Core i5-12450H Graphics: NVIDIA geForce RTX 4060 Laptop GPU