How to Clear Cookies in Firefox

Written by Jack Lloyd

Last Updated: April 4, 2019 Tested

This wikiHow teaches you how to delete all cookies from your Firefox browser on a computer or a mobile item. Cookies are small files which save pieces of information about your browsing; if you want to delete these files, you can do so from within Firefox's settings.

Method 1

Method 1 of 3:

On Desktop

1
Open Firefox. Click or double-click the Firefox app icon, which resembles an orange fox on a blue background.
2
Click ☰. It's in the top-right corner of the window. A drop-down menu will appear.

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3
Click Library. This is near the top of the drop-down menu. Doing so opens a new page in the menu.
4
Click History. It's near the top of the drop-down menu.
5
Click Clear Recent History…. This option is at the top of the "History" drop-down menu. A pop-up window will appear.
6
Click the "Time range to clear" drop-down box. It's at the top of the pop-up window. Doing so prompts a drop-down menu.
7
Click Everything. This is in the drop-down menu. Selecting it ensures that all of your browser's cookies will be deleted (as opposed to only cookies from a day's or a week's time).
8
Check the "Cookies" box. It's in the middle of the pop-up window.
- You can uncheck everything else in this window, but the "Cookies" box must be checked.
- Any checked items will be permanently erased when you clear the cookies.
9
Click Clear Now. This option is at the bottom of the pop-up window. Your Firefox cookies will be cleared.
- It may take a few minutes for Firefox to finish clearing your cookies.
10
Prevent cookies from appearing in the future. If you don't want Firefox to store cookies, you can disable them by doing the following:
- Click ☰.
- Click Options (on a Mac, click Preferences).
- Click the Privacy & Security tab.
- Scroll down and select to the "Custom" option near the top of the page.
- Check the "Cookies" box.
- Select "All Cookies (will cause websites to break)" option.

Method 2

Method 2 of 3:

On iPhone

1
Open Firefox. Tap the Firefox app icon, which resembles an orange fox on a dark-blue background.
2
Tap ☰. It's in the bottom-right corner of the screen, though you may have to scroll up or down to make it appear. Doing so opens a menu.
3
Tap Settings. This is in the menu. Tapping it opens the Settings page.
4
Scroll down and tap Clear Private Data. You'll find this option in the middle of the Settings page.
5
Tap the white "Cookies" switch. The switch will turn blue, signifying that cookies will be cleared when you opt to clear your private data.
- You can ensure no other data is deleted by tapping any other blue switches on the page to turn them off, but the "Cookies" switch must be blue.
- If the "Cookies" switch is already blue, skip this step.
6
Tap Clear Private Data. It's at the bottom of the screen.
7
Tap OK when prompted. This will prompt Firefox to begin clearing your cookies.
- It may take a few minutes for Firefox to finish clearing your cookies.

Method 3

Method 3 of 3:

On Android

1
Open Firefox. Tap the Firefox app icon, which resembles an orange fox on a dark-blue background.
2
Tap ⋮. It's in the top-right corner of the screen. A drop-down menu will appear.
3
Tap Settings. This is in the drop-down menu. The Settings page will open.
4
Tap Clear private data. It's near the top of the Settings page.
- If you're on a tablet, you'll find this on the left side of the Settings page.
5
Tap Clear now. This is at the top of the Clear Private Data page.
6
Check the "Cookies & active logins" box. You can uncheck every other box on the page, but the "Cookies & active logins" box must be checked.
- If this box is already checked, skip this step.
7
Tap CLEAR DATA. It's in the bottom-right corner of the screen. Your Firefox cookies will begin clearing.
- It may take a few minutes for Firefox to finish clearing your cookies.
8
Prevent cookies from appearing in the future. If you don't want Firefox to save cookies on your Android, you can disable them by doing the following:
- Tap Privacy on the Firefox Settings page.
- Tap Cookies.
- Tap Disabled in the pop-up menu.