Content

• Steps
• Advice
• Warning

In this article, wikiHow will show you how to delete all cookies on Firefox browsers on computers and mobile devices. Cookies are small files that are used to store your browsing information. If you want, you can completely delete them from the Firefox settings menu.

Steps

Method 1 of 3: On the computer

1. 

   Open Firefox. Click the Firefox application icon with an orange fox on a dark green background.

2. 

   
   
   Click the button ☰ in the upper right corner of the window. A drop-down menu will appear.

3. 

   Click Thư viện (Gallery) near the top of the drop-down menu will open a new page on the menu.

4. 

   
   
   Click History (History) is near the top of the drop-down menu.

5. 

   Click on the option Clear Recent History ... (Clear recent history) at the top of the "History" drop-down menu. A new window will appear.

6. 

   
   
   Click the "Time range to clear" drop-down box to open a new menu. This box is at the top of the window that appears.

7. 

   
   
   Click an option Everything (Everything) in this menu. Then, instead of just cookies for a day or a week, all cookies that are on your browser will be deleted.

8. 

   Check the box "Cookies" located in the middle of the new window that appears.
   • You can uncheck every item in this window except "Cookies".
   • Any selected item will be erased when you proceed to delete cookies.

9. 

   
   
   Click on the option Clear Now (Delete Now) at the bottom of the window that appears. Firefox cookies will be deleted.
   • This may take a few minutes.

10. 

    Prevent cookies from reappearing. If you don't want Firefox to store cookies, you can disable them by:
    • Click ☰.
    • Press Options (Optional) or for a Mac, press Preferences (Option).
    • Click the card Privacy & Security (Privacy & Security).
    • Scroll down to the "Cookies and Site Data" heading.
    • Check the box "Block cookies and site data".
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Method 2 of 3: On an iPhone

1. 

   
   
   Open Firefox. Click the Firefox application icon with an orange fox on a dark green background.

2. 

   Press the button ☰ in the lower right corner of the screen. In some cases, you may have to scroll up or down to find it. A menu will appear.

3. 

   Click Settings in the menu that appears to open the Settings page.

4. 

   Scroll down and tap the option Clear Private Data (Clear privacy data) in the middle of the Settings page.

5. 

   Click the white "Cookies" slider. This bar will turn green, indicating that cookies will be deleted when the clear privacy data option is selected.
   • In order not to delete any other data by mistake, tap to turn off any other sliders on the page. Note that the "Cookies" slider must be green.
   • Skip this step if the "Cookies" slider is already green.

6. 

   Press Clear Private Data at the bottom of the page.

7. 

   Press OK when prompted for Firefox to begin deleting cookies.
   • This may take a few minutes.
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Method 3 of 3: On Android

1. 

   Open Firefox. Click the Firefox application icon with an orange fox on a dark green background.

2. 

   Press the button ⋮ in the upper right corner of the screen. A drop-down menu will appear.

3. 

   Click on the item Settings (Settings) in the drop-down menu to open this page.

4. 

   Click on the option Clear private data (Clear Privacy Data) is near the top of the Settings page.
   • For tablets, this option is on the left side of the Settings page.

5. 

   Click on the option Clear now (Clear Now) at the top of the Clear Private Data page.

6. 

   Check the box "Cookies & active logins" (Cookies & login history). You can uncheck every box contained on this page except "Cookies & active logins".
   • Skip this step if the box above is already selected.

7. 

   Press CLEAR DATA (Clear data) in the lower right corner of the screen. The cookie deletion process in Firefox will begin.
   • This may take a few minutes to complete.

8. 

   Prevent cookies from reappearing. If you don't want Firefox to save cookies on your Android device, you can disable them by:
   • Press Privacy (Privacy) on the Firefox Settings page.
   • Press Cookies.
   • Press Disabled (Off) in the menu that appears.
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Advice

• Thanks to cookies, the load time is shortened and the website can remember your login information. Therefore, keeping cookies is not necessarily a bad thing.

Warning

• Disabling cookies in Firefox may prevent you from loading certain pages or certain page features.