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Cookies and other data is stored on your computer by websites you visit. Learn how to block websites from storing this data in Firefox.

[[Cookies - Information that websites store on your computer|Cookies]] and other site data is stored on your computer by websites you visit. The stored data contains information such as site preferences and login status. This article describes how to block websites from storing this data in Firefox. __TOC__ = Block cookies for a single website = You can use the [[Firefox Page Info window|Page Info window]] to set Firefox to block cookies from one website: # Go to the website you wish to block from setting cookies in Firefox. # [[T: ContextMenu]] within the page and select {menu View Page Info}. # In the Page Info window, select the {menu Permissions} panel. # Underneath '''Set Cookies''', remove the check mark from '''Use Default'''. # Change the setting to '''Block'''. #;{for win}[[Image:Fx59PageInfo-BlockCookies]]{/for} # Close the Page Info window. Remove any cookies that the website has already set in Firefox. For instructions, see [[Delete cookies to remove the information websites have stored on your computer]]. = Block cookies for more than one website = If you have more than one website you want to block, using the [[Firefox Page Info window|Page Info window]] for each site can be time-consuming. You can block individual websites by entering their address into your Firefox [[Template:optionsorpreferences]] '''Exceptions''' list for cookies{for fx60} and site data{/for}, as follows: {for fx60} #[[Template:optionspreferences]] #Select the {menu Privacy & Security} panel and go to the '''Cookies and Site Data''' section. #;[[Image:Fx60Settings-CookiesAndSiteData]] #Next to '''Accept cookies and site data from websites (recommended)''' click {button Exceptions…}. The ''Exceptions - Cookies and Site Data'' dialog box will open. #;[[Image:Fx60Settings-CookiesAndSiteData-Exceptions]] #Type in the exact address of the site you want to block. #Click {button Block}. #Click {button Save Changes} to finish. {/for} {for not fx60} #[[Template:optionspreferences]] #[[Template:customhistory]] #Next to {for not fx56}'''Accept cookies from sites'''{/for}{for fx56}'''Accept cookies from websites'''{/for}, click {button Exceptions…}. The ''Exceptions - Cookies'' dialog box will open. #;[[Image:Fx59Settings-Cookies-Exceptions]] #Type in the exact address of the site you want to block. #Click {button Block}. #Click {button Save Changes} to finish. {/for} To remove cookies that were stored previously, see [[Delete cookies to remove the information websites have stored on your computer]]. = Viewing a list of blocked sites = To see a list of sites that you have blocked from setting cookies: {for not fx60} # [[T:optionspreferences]] # Select the {for not fx56}{menu Privacy}{/for}{for fx56}{menu Privacy & Security}{/for} panel and go to the '''History''' section. # In the drop-down menu next to {for not fx56}'''Firefox will:'''{/for}{for fx56}'''Firefox will'''{/for} choose {menu Use custom settings for history}. #;{for not fx56}[[Image:Fx52CustomHistory]]{/for}{for =fx56}[[Image:Fx56CustomHistory]]{/for}{for fx57}[[Image:cookies exceptions 57]]{/for} # Next to {for not fx56}'''Accept cookies from sites'''{/for}{for fx56}'''Accept cookies from websites'''{/for}, click {button Exceptions…}. {/for} {for fx60} # [[T:optionspreferences]] # Select the {menu Privacy & Security} panel and go to the '''Cookies and Site Data''' section. #;[[Image:Fx60Settings-CookiesAndSiteData]] # Next to '''Accept cookies and site data from websites (recommended)''', click {button Exceptions…}. {/for} = Block cookies for all sites = To set Firefox to block cookies from all websites: {for not fx60} # [[T:optionspreferences]] # Select the {for not fx56}{menu Privacy}{/for}{for fx56}{menu Privacy & Security}{/for} panel and go to the '''History''' section. # In the drop-down menu next to {for not fx56}'''Firefox will:'''{/for}{for fx56}'''Firefox will'''{/for} choose {menu Use custom settings for history}. # Remove the check mark from {for not fx56}'''Accept cookies from sites'''{/for}{for fx56}'''Accept cookies from websites'''{/for}. # [[T:closeOptionsPreferences]] {/for} {for fx60} # [[T:optionspreferences]] # Select the {menu Privacy & Security} panel and go to the '''Cookies and Site Data''' section. # Select '''Block cookies and site data (may cause websites to break)'''. # [[T:closeOptionsPreferences]] {/for} To remove cookies that were stored previously, see [[Delete cookies to remove the information websites have stored on your computer]]. = Block third party cookies = To set Firefox to accept cookies only from the website you're currently visiting, see [[Disable third-party cookies in Firefox to stop some types of tracking by advertisers]].