On your computer, open Firefox.
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At the top right, click the three horizontal lines.
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In the drop-down menu, please click on Options.

4. Select Privacy & Security

5. Scroll down until you come to "Cookies & Site Data"
6. Select "Clear Data"

7. In the Clear Data pop-up window. Ensure the check boxes for "Cookies and Site Data" and "Cached Web Content" are selected.
8. Select the Clear button.

9. In the "Clear all cookies and site data" pop-up, select the Clear Now button.

10. Close all Firefox windows that you have open, restart Firefox, and continue to work as normal.