Mozilla Firefox has an "Options" menu, where you can adjust your online experience. In a few steps, you can set the Internet options in Firefox
Launch Firefox. From the "Tools" menu, select "Options." The Options dialog appears.
Click the "General" icon. You can manage options for Startup, Downloads and Add-ons. Use this tab to select your home page, set how downloads from the Internet are handled and to make Firefox your default browser.
Click the "Tabs" icon. You can modify the way Firefox handles opening new windows from links within an already displayed page. Right-clicking a link also gives you these options and several more. But if you want Firefox to display new windows in one particular way all the time, setting this option is very helpful.
Click the "Applications" icon to modify the action Firefox should take when encountering a particular file format.
Click the "Privacy" icon, which will allow you to indicate how Firefox stores information about you and outside websites, as well as keeping a running list of places you have visited. You can set History, which records the pages you have previously viewed. You can also remove individual cookies, which store information about your browsing experience.
Click the "Security" icon. The security dialog allows you to inspect the list of blocked sites. You can have Firefox remember passwords and password options.
Click the "Sync" icon. This option lets you set up or manage a Firefox Sync account, which lets you synchronize your bookmarks, history, open tabs and passwords with another copy of Firefox -- like one on another computer or on a mobile phone.
Click the "Advanced" icon. The advanced options let you change how Firefox behaves when in use, connection, language and spelling settings.