Firefox Memory Leak

How to fix Firefox memory leak with Firemin. Rizone Firemin (formerly known as Firefox Plumber) sits idly on the background (and on your Windows system tray) and manages Firefox’s memory behind the scene (they call it “babysitting” Firefox on the product page:) which I think is the perfect sentence for this case). Firemint is here to fix. Kelvin Au's Blog Post. I have been planning to write more articles, but in last few months I was quite busy on working for the project, which is a platform that helps students in California to find all the transferable courses with continuous up-to-date data from 100+ colleges.The project is quite stable now and I have more time to write more articles (there is a list of items I.

Want to know why Firefox uses too much memory (RAM) or how to fix Firefox memory leak? Learn how to fix Firefox using too much Memory and CPU resources

Firefox Memory Leak

Undoubtedly, Mozilla Firefox sometimes uses more memory (RAM) than it should. But you shouldn’t worry too much because using popular web browsers like Google Chrome, Mozilla Firefox or even any web browser for a long time will lead to the low speed of the browser and will start eating up a lot of resources.

Firefox using too much memory and Mozilla Firefox high CPU usage are some of the most common issues experienced by a lot of Mozilla Firefox web browser users. And one of the best ways to reduce Firefox high memory usage or fix Firefox using too much memory issue is by reinstalling the browser as it will clear all the files completely. However, there are plenty of hacks to reduce Firefox memory usage without reinstalling available too which you can follow in order to easily fix Firefox memory leak issue.

You will find many different methods on the internet which will help you in troubleshooting Firefox memory leak issue and if you want to find out what these methods are then you can have a look below where we have mentioned how to reduce memory usage in Mozilla Firefox web browser and speed up Firefox browsing.

You may also be interested in checking out:

Quick Navigation:

How to Reduce Firefox High Memory Usage

There is a total of six useful methods which we are going to share in this Mozilla Firefox speed up tutorial. You can follow any of these methods and find out how fix Firefox using too much memory and CPU resources. Here we go:

Important note:Before following the below-explained hacks, we recommend you to backup your existing Mozilla Firefox profile and experiment in another profile. The backup will help you in future to easily restore your current settings and preferences.

Method 1: Fix Firefox High Memory Usage by Assigning Fixed Memory Cache

The Huge amount of memory is used in Mozilla Firefox by default. What you can do is assign specific size memory cache for Mozilla Firefox so that it is not interfering with system memory and is not leading to Firefox high CPU usage issue.

You can follow the steps shared below to find out how to assign fixed memory cache to Firefox:

  • First of all, type about:config in the address bar of your Firefox browser and press Enter.
  • Next, you have to add a value in the “browser.cache.memory.enable” preference. Simply, double click on browser.cache.memory.enable and set its value as True.
  • Next, right-click on any value and select New > Integer option then enter browser.cache.memory.capacity in the “Enter the preference name” box. Finally, click on OK button.
  • Now, if you are having 4 GB RAM on your system then you can enter 256 MB and if you are having 8 GB RAM you can enter 512 MB in the “Enter integer value” box and then click on OK button.

That’s it! Once you assigned the RAM Cache in Firefox, you should be able to fix Mozilla is using too much memory and Mozilla Firefox high CPU usage issue

Must check: How to Fix “The proxy server is refusing connections” Error in Firefox

Method 2: Releasing Memory after Minimizing Firefox

You can also set the option to release the memory consumed by Mozilla Firefox after you minimize it as it will also help you in fixing Firefox taking too much memory problem. Here’s how to do so:

  • Open Firefox browser and type about:config in the address bar.
  • Next, right-click anywhere in the browser and then select New > Boolean option.
  • Now, type confirm.trim_on_minimize in the “Enter the preference name” box. Finally, click on OK button.

Releasing memory after minimizing Firefox is really a helpful way of reducing memory usage in Mozilla Firefox browser. So, this action will result in the reduction of memory when you will minimize Firefox browser on your computer.

Method 3: Reduce Mozilla Browser Session History

Total 50 websites are saved in the memory of Mozilla Firefox by default. It means that if you have accessed 50 webpages on Mozilla Firefox, you will be able to see all these web pages in the cache memory or history of your browser. Reducing Firefox browser session history is also an amazing Firefox high memory usage fix.

You can follow the steps mentioned below and find out how to fix Firefox taking too much memory by reducing Mozilla browser session history:

  • At first, open Mozilla Firefox web browser and type about:config in the address bar.
  • Now, you have to find browser.sessionhistory.max_entries preference.
  • Once you have located this field, right click on it and then Modify it to any lower value you want to. Finally, click on OK button.

As you can see, here we have decreased the browser session history value from 50 websites to only 10 websites.

Method 4: Don’t Remember Download History

Mozilla Firefox browser saves the download history by default. If you think that there is no use of this feature for you on the Firefox browser then you can disable it easily by following the steps which are mentioned below:

  • First of all, open Mozilla Firefox browser and then go to Tools and then select Options tab.
  • Next, click on Privacy option and then select Use custom settings for history option from the Firefox will drop-down menu.
  • Finally, uncheck the option which says “Remember my browsing and download history” option.

From now onwards whatever you download won’t be saved in the download history of your web browser. This method will help you in solving Firefox taking too much memory issue.

Method 5: Speed up Page Display Time

HTML pages are rendered in Firefox after a fixed interval of time. You can set that interval to 0 as it will help you in loading the pages faster as soon as you enter URL in the address bar.

In order to speed up page display time, open Firefox browser and then type about:config in the address bar. Once opened, you have to make new integer preference by doing a right click. Enter nglayout.initialpaint.delay in preference name and mention value 0 there.

Do you know? How to Disable or Remove Google Chrome Extensions

Method 6: Don’t use Add-ons

This is the last Mozilla Firefox using too much memory fix which makes to our list. You should use bookmarklet instead of add-ons on Mozilla Firefox browser as add-ons lead to high memory usage on Firefox web browser.

As Firefox gets updated from time to time, add-ons don’t which make bookmarklet a better option. It is easy to use bookmarklet as all you have to do is drag and drop the bookmarklet in the bookmarks toolbar of your Firefox browser.


If you don’t want to reinstall Mozilla Firefox web browser but are wondering how to fix Firefox using too much memory and CPU resources issue then you can follow the methods to troubleshoot Firefox high memory usage which we have mentioned above.

Do you know any better solution to fix Firefox using too much memory or get rid of Firefox memory leak? If yes, let us know via comments.

Trending Now:How to Enable Cookies in Chrome, Firefox, IE, and Safari

Summary :

A large number of people complain that they often encounter the Firefox memory leak. What causes Firefox using too much memory? Are there any solutions to the issue? Let’s explore them together with MiniTool.

Quick Navigation :

If you often use the Mozilla Firefox browser, you may be familiar with the Firefox memory leak error. What causes Firefox using too much memory? The major cause behind the error comes from resource-consuming extensions. In addition, using too many tabs and outdated version can trigger the error.

Now, let’s see how to fix the Firefox memory leak.

What is MRT.exe? Is it a virus or malware? How to fix MRT.exe high CPU usage and memory usage? This post will explore these questions one by one.

Solution 1. Disable the Source Consuming Extensions

Extensions and themes consume much system resources, which can cause Firefox memory leak. You can start your Firefox into Safe Mode and check what are consuming too much memory. Here’s how to do that:

Step 1. Open your Mozilla Firefox, and then click on the Menu > Help > Restart with Add-ons Disable from the upper right corner.

Step 2. Click on the Start in Safe Mode button. Then Firefox will boot into Safe Mode and you can see the resource-consuming extension and themes.

Step 3. Back to the Menu button at the upper right corner and click on Add-ons to view all installed extensions and themes.

Step 4. Go to the Extensions tab from the left side, and then click on the Three dots on the right side and click on Remove. After that, repeat this step to disable all resource-consuming extensions.

Solution 2. Minimum Memory Usage

Mozilla Firefox has a feature that can be used to minimize memory usage. To fix the Firefox hogging memory issue, you can enable this feature. Here’s how:

Step 1. Launch your Mozilla Firefox browser, and then type memory in the Address Bar and hit Enter.

Step 2. Click on the Minimize memory usage feature under the Free Memory tab.

Now, restart your browser and see if Mozilla Firefox using too much memory.

Solution 3. Update Firefox

The updated Firefox version always contains many performance improvements. Updating it to the latest version could fix Mozilla Firefox memory leak. If you are not using the latest one, follow the steps below to update Firefox.

Step 1. Click the Menu at the upper right corner and select Help from the drop-down menu.

Step 2. Select About Firefox from the submenu. If there are any updates available, they will be installed automatically.

Firefox Memory Leak

Solution 4. Enable Hardware Acceleration

It’s well known that hardware acceleration can help optimize memory and CPU usages. To troubleshoot Firefox memory leak, you can enable hardware acceleration.

Step 1. Open a page that is using Flash video, and then right on it to open Settings.


Step 2. Click on Open the Adobe Flash Player and open the Display panel.

Step 3. Click the Menu at the upper right corner and select Options from the drop-down menu.

Step 4. Tick the checkbox next to Use hardware acceleration when available under the Performance tab.

Now, restart the browser and see if the Mozilla Firefox memory leak issue has been resolved.

Solution 5. Use Fewer Tabs

As you might know, each tab requires Firefox to store a web page in memory. If you open too many tabs at the same time, this may affect your memory and cause the Firefox hogging memory issue. So we recommend you use fewer tabs by closing the tabs that you’re not using frequently.

Are you keep using the default theme for Firefox? Do you know how to enable Firefox dark mode to protect your eyes at night? Here is the tutorial.

Solution 6. Change the Content Process Limit

In some cases, using multiple content processes can help improve performance and minimize the impact of content process crashes. Here you can try changing the content limit to fix the Firefox memory leak issue. To do so, follow the steps below:

Firefox Memory Leaks

Step 1. Click the Menu at the upper right corner and select Options from the drop-down menu.

Firefox Memory Leak Facebook

Step 2. Go to the General tab on the left side, and then scroll down to the Performance section and check the box for Use hardware acceleration when available.

Step 3. Select the 8 (default) from the Content process limit drop-down menu.

Firefox Memory Leak Fix

Also, you can set the content process limit between 1 to 8 processes.