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The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Learn how to make Firefox your default browser in Windows 10.
The Firefox "Page Info" window gives you details about the page you're on. You can also use it to change permissions for the website.