1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.

2. Select the Privacy & Security panel and go to the History section.

3. In the drop-down menu next to Firefox will, choose Use custom settings for history.
4. Click Show Cookies.... The Cookies window will appear.

   

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.

   
   Tip: Select the first cookie and press Shift + End to select all the cookies in the list.

6. Select the cookie(s) in the list to remove and click Remove Selected.
7. Click Close to closeClose the Cookies window. Close the about:preferences page.

1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.
2. Select the Privacy & Security panel and go to the Cookies and Site Data section.

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3. Click the Manage Data… button. The Manage Cookies and Site Data dialog will appear.
4. In the Search websites field, type the name of the site whose cookies you want to remove. Items that match your search will be displayed.

   

   • To remove all cookies and storage data for the website, click Remove All Shown.
   • To remove selected items, select an entry and click Remove Selected.
5. Click Save Changes.
6. In the Removing Cookies and Site Data confirmation dialog that opens, click Remove.
7. Close the about:preferences page.

To learn more about managing site data in Firefox, see Manage local site storage settings.

1. Click the menu button and click Library (or click the Library button in the toolbar).
2. Click History and then click Clear Recent History….
3. Set Time range to clear to Everything.
4. Click on the arrow next to Details to expand the list of history items.
5. Select Cookies and make sure that other items you want to keep are not selected.
6. Click Clear Now to clear the cookies and close the Clear Recent History window.

1. Click the menu button , 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.

   

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