Final answer:
To manage cookie settings in Mozilla Firefox, click on the three horizontal lines menu icon (☰) in the upper right corner and select Options. From there, navigate to the Privacy & Security section to manage your cookie settings.
Step-by-step explanation:
To manage cookie settings in Mozilla Firefox, you would click on the three horizontal lines menu icon in the upper right corner (☰). This icon is also known as the hamburger menu. When you click on it, a drop-down menu will appear. From there, you can select Options.
In the Options menu, click on Privacy & Security in the left sidebar. Then, scroll down to the Cookies and Site Data section. Here, you can manage your cookie settings by clicking on Manage Exceptions or Clear Data.