Firefox Community Forum

Hi, I’ve noticed that Firefox often uses a lot of memory when I have multiple tabs open, even more than Chrome or Edge on the same number of tabs. Sometimes it slows down my system or makes switching between tabs laggy.

Is this normal behavior, or is there a way to reduce Firefox’s RAM usage without losing performance? Are there specific settings, add-ons, or troubleshooting steps I should try?

Thanks in advance!

I've uninstalled every profile and installation of firefox. All addons are gone.

Upon reinstalling regular firefox, doing refresh, and syncing my account, the browser immediately freezes.

This issue has started within the past week. I've not done any major changes to my computer or firefox in general. Edge browser does not have this issue.

about:processes also freezes, making troubleshooting difficult.

I'm currently running firefox without syncing at the moment, but this isn't an ideal long term solution.

Hi everyone,

I’ve noticed that Firefox tends to use a lot of memory when I run several browser-based tools at once — especially web calculators or dashboards that update data dynamically.

For example, when I’m testing a lightweight web calculation app (something similar to a gratuity calculator that updates values in real time), Firefox memory usage slowly increases, and sometimes the browser even freezes if multiple tabs are open.

I’ve already tried:

Clearing cache and disabling extensions

Running in Safe Mode

Using hardware acceleration on/off

Still, the problem persists.

So I’d like to ask:

1. Are there any specific settings or flags that can help manage memory usage better for interactive web tools?

2. Does Firefox handle JavaScript-heavy calculations differently compared to Chromium-based browsers?

3. Any recommended performance tweaks for developers testing such tools locally?

Would really appreciate advice from anyone who’s optimized Firefox for this kind of lightweight, web-app testing.

Thanks in advance! 🙏 bold text

Your browser dead ass just doesn't respond when I click on it. I have a new mac mini 4 and have the latest update for firefox. it's absolute dogshit to be honest. I'm lucky if the browser lets me click on anything, eg., bookmarks, add-ons, history are nonfunctional. Also my tabs on the browser get squished together and superimposed such that 2-3 separate tabs appear as though they are one tab. I have never had an issue like this before when using firefox. I don't encounter the issue with safari or chrome, but I don't like those browsers. Do you have insight as to why firefox mozilla is suddently ass?

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Hi I always use Firefox on my Apple I-Mac and it has always been excellent but in the last couple of weeks a window pops up to say that Dashlane is slowing down Firefox when I am trying to type in E-Bay. Not yet seen it in any other situation but it it virtually preventing me listing items for sale on E-Bay. Always have Dashlane open on Firefox whenever I am using Firefox/the internet. Today I reinstalled Firefox but it is still doing it. Help please! Kind regards Jeff Worth

For some reason, the Menu Bar kept coming up, even after I disabled it. I tired a few about:config things, the one that seemed to work was to disable the ALT key. But I still can't click anything in a game with my mouse while firefox is open. I have two monitors. I have uninstalled and reinstalled Firefox. I've looked around the internet and I can't seem to find my exact problem. Please, please help!

Even with just 1 tab open, Firefox is killing my laptop battery.

Win 11 PC laptop.

In background, it is using 40% to 50% of the laptop battery. I need much better performance from it. I have already turned off any settings I can find regarding Firefox's background functions. When I quit Firefox I want it completely off.

How can I do that?

I have an issue where my firefox freezes whenever I try to take certain actions inside home assistants music assistant. I have created the following profiler of the issue https://share.firefox.dev/4pPZRPo

I have tried all the recommended settings to mitigate these kinds of problems (remove hardware acceleration, set disable all addons). I don't know where to report this exactly, but I'm hoping someone might be able to see something from the profiler that could illuminate what exactly is going wrong?

Notably this issue does not happen in firefox private mode.

This is happening more frequently. sometimes clicking links works but the cursor will not respond if i hover over the new tab button. To continue I have to select a new firefox window, The unresponsive window remains in error even when a new working window is active.