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Cookies are stored on your computer by websites you visit and contain information such as site preferences or login status. This article describes how to delete cookies in Firefox.

Delete cookies for a single site

To delete cookies for one site:

  1. At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

    Click the menu button New Fx Menu and choose Options.Preferences.

  2. Select the Privacy panel.

  3. Set Firefox will: to Use custom settings for history.
    Custom History Fx21 WinXP Custom History Fx21 Win7 Custom History Fx21 Mac Custom History Fx21 Linux customhistory38
  4. Click Show Cookies.... The Cookies window will appear.
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  5. In the Search: field, type the name of the site whose cookies you want to remove. The cookies that match your search will be displayed.
  6. Select the cookie(s) in the list to remove and click Remove Selected. Privacy - show cookies - remove selected - firefox 38
    • Select the first cookie and press Shift+End to select all the cookies in the list.
  7. Click Close to closeClose the Cookies window. Close the about:preferences page.

Delete all cookies

To delete all cookies stored on your computer, either open the Cookies window as explained above and use the Remove All Cookies button, or else do the following:

  1. Click the menu button New Fx Menu , choose History, and then Clear Recent History....
  2. Set Time range to clear to Everything.
  3. Click on the arrow next to Details to expand the list of history items.
  4. Select Cookies and make sure that other items you want to keep are not selected.

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  5. Click Clear Now to clear the cookies and close the Clear Recent History window.
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