Mac Performance

How to Clear Cache in Firefox on Mac

Is your Mac’s performance slowing down? Are there errors on the websites you visit? You might have cache buildup and cookie debris.


Just like untended clutter in your home, computer browsers gather dust, aka caches, in the form of saved files from websites you frequently visit. While caches are meant to help speed up your browsing experience, unused files can accumulate very quickly, affecting your Mac’s speed and causing website glitches.


If you’re worried about clearing your browser cache, rest assured, it’s perfectly safe. Regularly putting time aside to clear the cache on your Mac is good tech hygiene. It frees up valuable space and can help you troubleshoot when your system is running slow.


So if you’re facing an issue with Firefox or feel that it’s time for a little browser cleanup, continue reading, and we’ll walk you through the process of clearing the cache on Firefox for Mac.


Before we begin


Mac cleaning software can do wonders for freeing up valuable storage space and improving your device’s overall performance. MacKeeper’s Safe Cleanup tool makes removing cache and other hard-to-reach digital messes a breeze.


With its intuitive design and user-friendly interface, MacKeeper gets rid of all the unnecessary junk and clutter that manual system maintenance just can’t do. Here’s how to quickly clean junk files from Mac:

  1. Download MacKeeper and select Safe Cleanup from the sidebar.
  2. Click Start Scan.
  3. Wait for the scan to complete and click Clean Junk Files.

With MacKeeper’s ability to clear cookies on Mac easily, you’ll have a more enjoyable browsing experience. Plus, if you’re after premium macOS cleanup and system optimization tools packaged alongside a great antivirus security suite, look no further than MacKeeper.

Why do you need to clear the cache in Firefox on a Mac

Browsers like Firefox save or “cache” hundreds of data, like media files and webpages, to help users' website experience. But too much cache can slow down your computer. Regularly clearing your cache tidies your browser’s storage room and clears any unnecessary data saved from websites you’ve visited.

How to clear Firefox cache manually on Mac

To manually clear cache from Firefox on Mac, follow the steps below:

  1. Open the settings on Firefox.
  2. Go to Privacy and Security.
  3. Find cookies and site data.
  4. Clear cache.

Once cleared, your Mac’s performance should increase and overall improve your future browsing experience. Clearing your history in Firefox can also help, but you be sure you aren’t accidentally erasing data you may need later.

1. Open the settings menu in Firefox

Clearing the cache from Firefox is super easy:

  1. Start by clicking the burger menu found in the top right corner of the screen.
  2. Choose Settings or Preferences, depending on the version you’re using, from the drop-down list.

2. Go to the Privacy and Security

The next step to clear your cache in Firefox is modifying the browser settings:

  1. Go to Privacy and Security, which can be found on the left-hand side of the window. This setting allows you to control all aspects related to your online privacy and Firefox browsing security.
  2. Here, you’ll find options for managing cookies, passwords, website permissions, and tracking protection.

3. Find cookies and site data

What’s next? You need to find cache files to delete them. Here’s how:

  1. Once you’ve selected Privacy and Security, you’ll want to look for the section that says Cookies and Site Data. This is where Firefox stores all your cookies and website data like login credentials and site preferences.
  2. To clear your cache, look for the button labelled Clear Data.

4. Clear cache

Finally, you’re at the final stage of the cache removal process:

  1. After you click Clear Data, a small window should pop up confirming your action.
  2. To continue clearing your cache, simply choose the data you want to delete by ticking its respective box, and click the Clear button.

And that’s it! Now you know how to manually empty cache on Firefox on Mac.

To clear the cache from Firefox, open Firefox and access the settings by clicking on the three-lined menu icon in the top-right corner of the browser window.
Step 1. Open Firefox and go to Settings
In the settings menu, go to the Privacy and Security section, which can typically be found towards the bottom of the menu list on the left-hand side.
Step 2. Select Privacy and Security
Within the Privacy and Security section, find the Cookies and Site Data option. This is where you'll manage your browser's stored data.
Step 3. Go to Cookies and Site Data > Clear Data
Finally, within the Cookies and Site Data settings, you'll find the option to clear the cache. Click on this option to start the cache clearing process on Firefox.
Step 4. Click on the Clear button to empty your cache in Firefox

Note from our experts: 


If your Firefox is still running slow, consider getting rid of browser toolbars you aren’t using. Toolbars needlessly running in the background can sometimes eat up your system's resources, causing your browser to lag.

How to automatically clear the cache in Firefox on Mac

Firefox gives you the option to automatically clear cache when you close the browser. To enable this setting, do the following:

  1. Open Firefox’s Settings then go to Privacy and Security.
  2. Under the Cookies and Site Data section, tick the box for Delete cookies and site data when Firefox is closed.
To automatically clear the cache on Firefox, firs you need to launch Firefox on your Mac and click on the menu icon located at the top-right corner of the browser window. From the dropdown menu, select Preferences or  Settings, depending on your Firefox version.
Step 1. Go to Preferences
In the Preferences or Settings menu, scroll down and click on the Privacy and Security tab, typically found on the left-hand side.
Step 2. Select Privacy and Security
Within the Privacy and Security tab, scroll down until you find the Cookies and Site Data section. Under this section, tick the box for Delete cookies and site data when Firefox is closed.
Step 3. Tick Delete cookies and site data when Firefox is closed

Hint from our team: 


While there’s no one-size-fits-all answer for how often you should be clearing your cache and cookies, as a general rule, you should be doing it at least once a month.


And while Firefox’s automatic cache clearer is a convenient set-and-forget option, you do run the risk of deleting a while you may need in the future. Using a tool like MacKeeper’s Safe Cleanup means you can safely pick and choose the data you want to remove without having to go through the entire manual process. It’s an easy-to-use cache cleaner that works like a charm.  


Follow these steps to clear cache with MacKeeper:

  1. Open MacKeeper and select the Safe Cleanup feature from the main dashboard.
  2. Click Start Scan to begin the scanning process.
  3. Once the scan is complete, click on Caches, then choose the files you want to remove.
  4. Click Clean Junk Files to permanently remove selected files.

Et voila! MacKeeper makes cache removal as easy as child’s play. Try MacKeeper’s Safe Cleanup for free and never worry about cache build or browser errors again.  

To use MacKeeper to clear cache, first open the app and select the Safe Cleanup tool on the main dashboard.
Step 1. Open MacKeeper’s Safe Cleanup tool
Click on the Start Scan button to start the system scanning process.
Step 2. Click Start Scan to begin the cache clean up
Once the scan is complete, navigate to the Caches section within the scan results. Choose the cache files you wish to remove by selecting them.
Step 3. Select Caches from the list
After selecting the files, click on the Clean junk files button to permanently remove the selected cache files from your Mac.
Step 4. Click Clean Junk Files to safely remove caches on your Mac

The quickest and safest way to clear browser cache on Mac

Clearing your cache is never a bad idea. Occasionally, you’ll need to do it to keep your browser running smoothly, or if you simply want to protect your privacy and wipe off any data associated with the sites you’ve visited. Regularly clearing your cache also prevents clutter from accumulating and gives you an overall better browsing experience. And as you’ve seen from the steps laid out, the process isn’t hard, albeit a bit tedious.


This is where MacKeeper’s Safe Cleanup comes in handy, offering the quickest and safest way to remove browser cache. With our cleaning tool, you have full control over all your cache and data without having to go through the manual process.


MacKeeper also offers a convenient Find & Fix tool to resolve any lingering browser issues that may happen even after cache clearance. With its help, you'll never be left scratching your head, wondering what's gone wrong with your computer.


Please, note that MacKeeper is specifically designed for MacBooks and other Apple computers, making it compatible with all macOS systems, including the latest one.

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