How to Clear the Cache in Firefox

Speed up your browser quickly and easily

Clearing the cache in Firefox isn't something you have to do every day, but it is sometimes helpful in order to solve or help prevent certain problems.

The Firefox cache contains locally saved copies of recent web pages you've visited. This is done so that the next time you visit the page, Firefox can load it from your saved copy, which will be much faster than loading it all over again from the internet.

On the other hand, if the cache doesn't update when Firefox sees a change on the website or the cached files that do load are corrupted, it can cause web pages to look and act strangely.

Instructions in this article apply to Firefox version 73 but should work similarly in other versions. Update to the latest version of Firefox to follow along.

Clear Temporary Internet Files in Firefox

Follow the simple steps below to clear the cache from your Firefox browser. It's an easy process that takes less than a minute to complete.

Clearing the cache in Firefox is completely safe and shouldn't remove any important data from your computer. To clear the Firefox cache on your phone or tablet, check out the next section.

  1. Open Firefox and select the three-lined menu button (aka the "hamburger button") from the top right of the program, and then choose Options.

    Options submenu in Firefox Settings menu on Windows

    If Options isn't listed in the menu, select Customize and drag Options from the list of Additional Tools and Features over to the Menu. ​

    If you're using the menu bar, choose Tools and then Options instead. You can also enter about:preferences in a new tab or window.​

    Firefox for Mac: Choose Preferences from the Firefox menu and then continue as instructed below.

    Preferences menu item in Firefox for macOS
  2. Select the Privacy & Security or Privacy tab on the left.

    Privacy & Security tab on left of Options screen in Firefox
  3. Choose Clear History in the History section on the right.

    Clear History... button in Firefox

    If you don't see that link, change the Firefox will: option to Remember history. You can change it back to your custom setting when you're done.

  4. Set Time range to clear to Everything, or pick a different option that's relevant to how much of the cache you want to delete.

    Clear Everything option in Clear Recent History dialog box in Firefox
  5. Clear the checkboxes for everything except Cache in the list at the bottom of the window. If you wish to clear other kinds of stored data, like the browsing history, feel free to check the appropriate boxes; they'll be cleared along with the cache in the next step.​

    Cache checkbox in Clear All History dialog in Firefox

    Don't see anything to check? Select the arrow next to Details.

  6. Select Clear Now to start deleting everything you checked in the previous step.

    Clear Now button in Clear All History dialog in Firefox
  7. Wait for the window to disappear, which signifies that the saved files (the cache) has been cleared and that you can use Firefox normally again. If your internet cache is large, Firefox may hang while it finishes removing the files. Just be patient—it will eventually finish the job.

Clear the Cache From the Firefox Mobile App

Clearing the cache in the Firefox mobile app is very similar to when using the desktop version. The option to delete the Firefox cache is in the settings and you can choose what type of data to erase in addition to the cache, like browsing history and cookies.

  1. On Android, tap the three-dotted menu button at the top right of the Firefox app, and then tap Settings.

    On iOS, tap the three-lined hamburger menu at the bottom right, and then Settings.

    Three iOS screens showing Firefox icon, hamburger menu, and Settings button
  2. Select Clear private data on Android, or Data Management on iOS.

  3. Select Cache and any other items you want to clear.

  4. Choose CLEAR DATA on Android. For iOS, select Clear Private Data and then OK.

    Three iOS screens showing Firefox settings, including Data Management, Clear Private Data and the OK confirmation button

Tips & More Information on Deleting the Firefox Cache

You can save time and clear the cache as specifically as you want with some advanced methods and shortcuts.

  • Some older versions of Firefox have very similar processes for clearing the cache but you should try to keep Firefox updated to the latest version if you can.
  • Using the Ctrl+Shift+Delete combination on your keyboard will immediately put you at Step 5 above.
  • If you'd rather not delete all the cache stored by Firefox, you can instead pick a different time range at Step 5. You can pick Last Hour, Last Two Hours, Last Four Hours, or Today. In each instance, Firefox will only clear the cache if the data was created within that time frame.
  • Malware can sometimes make it difficult to remove the cache in Firefox. You might find that even after you've instructed Firefox to delete the cached files, they still remain. Try scanning your computer for malicious files and then starting over from Step 1.
  • You can view cache information in Firefox by entering about:cache in the navigation bar.
  • If you hold down the Shift key while refreshing a page in Firefox (and most other web browsers), you can request the most current live page and bypass the cached version. This can be accomplished without clearing out the cache like described above.