This document explains all of the optionspreferences available in the OptionsPreferences window of Mozilla Firefox. Click the menu button and choose Options.Preferences. to access the optionspreferences window.
The General panel contains optionspreferences related to the most commonly used settings, such as what you first see when Firefox starts and how Firefox handles file downloads. For more information, see Startup, home page, tabs, and download settings.
The Content panel contains optionspreferences related to how websites are displayed. For more information, see Settings for web content, pop-ups, fonts, and languages.
The Applications panel lets you decide how Firefox should handle different types of files (e.g. PDF documents or audio files). It shows you a list of content types and lets you select an action for each type, such as opening with an application, opening in Firefox using a plugin, or saving the file. For more information, see Applications panel - Set how Firefox handles different types of files.
The Privacy panel contains optionspreferences related to your privacy. As you browse the web, information on where you have been, what pages you have visited, etc. are stored here. For more information, see Settings for privacy, browsing history and do-not-track.
The Security panel contains optionspreferences related to keeping your web browsing safe. For more information, see Security and passwords settings.
The Sync panel lets you set up or manage a Firefox Sync account. Firefox Sync is a service that lets you synchronize your bookmarks, history, passwords and open tabs with another copy of Firefox – like one on another computer or on a mobile phone. For more information, see How do I set up Sync on my computer?, How do I set up Sync on my computer?, and How do I choose what types of information to sync on Firefox?.
The Advanced panel contains optionspreferences for settings that aren't used that often, such as checking to see if Firefox is the default browser, clearing the disk cache, settings for Firefox updates, and various advanced settings that only certain people may need. For more information, see Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox.