[step] Look for the icon with three short horizontal lines arranged one on top of the other found at the top-right corner of the browser. Click on the icon to display a drop-down menu..
[header] How to change your security settings on firefox [title] Launch firefox. [step] To open the firefox browser on your computer, click on its icon, which should be on your desktop, start menu, or taskbar. [title] Click on the settings button.