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Learn about content blocking, a new feature starting with Firefox version 63, which blocks trackers that cause pages to load slowly.

{for not fx63}{warning}This feature is available on a newer version of Firefox. [[Update Firefox to the latest version]].{/warning}{/for} Content blocking is a collection of Firefox settings allowing you to block content that affects privacy and browsing performance. Starting in 63, content blocking includes blocking for third-party tracking cookies and the feature previously called Tracking Protection, which blocks all detected trackers. When Firefox detects content that can be blocked on a website, a shield icon [[Image: FirefoxShieldIcon]] will appear in your address bar. ;[[Image:content blocking 63 URL]] Select the information icon or the shield icon to expand the Control Center for the site. This provides more information about the type of content Firefox has detected, such as detected trackers and trackers set by third-party cookies. (The Control Center is also where you manage your settings for this site.) ;[[Image:content blocking 63 details]] If trackers or third-party tracking cookies are not found on a site, the content blocking shield will not appear and the Control Center will display the message No blockable content detected on this page. ;[[Image:no blockable content 63]] __TOC__ =Turn Content Blocking on or off= In 63, content blocking includes settings for trackers and tracking cookies. By default, Firefox blocks trackers only in private windows and doesn’t block third-party tracking cookies at all. You can change preferences to block just third-party tracking cookies, to block all third-party cookies, and to block trackers all the time. You can also set your preferences to not block any content at all. #Expand the main Firefox menu button [[Image:fx57menu]] and select {menu Content Blocking}. This takes you to the Content Blocking section in preferences. Unselect “All Detected Trackers” to turn off Content Blocking across all sites. ;[[Image:content blocking 63]] =Turn Content Blocking off on individual sites= Sometimes, Content Blocking can prevent pages or parts of pages from loading. If Content Blocking interferes with your browsing, you can disable it for the site you are visiting. #The shield icon appears when Firefox is actively blocking content on a page. Select the shield icon to expand the Control Center panel. #;[[Image:content blocking url shield 63]] #Click {Button Disable blocking for this Site} #Once Content Blocking is disabled, a shield icon with a strikethrough will appear in your address bar. #;[[Image:blocking disabled 63]] #To resume content blocking, expand the Control Center panel and select {button Enable Blocking For This Site}. =Content Blocking in Private Browsing= Since private Browsing doesn’t save information about your browsing session, when you disable content blocking for a site, it only lasts for your current session. When you start a new private browsing session, your content blocking settings will be restored for all sites. If you’ve disabled content blocking for a site while in a normal browsing window, Firefox will continue to disable content blocking for this same site when in a private window. =Block lists in Firefox= You can change the block list used to block trackers. By default, content blocking uses the Disconnect.me basic protection list. You can change this to use the Disconnect.me strict protection list instead. *The basic protection list blocks commonly known analytics trackers, social sharing trackers, and advertising trackers. However, the basic protection list allows some known content trackers so that fewer pages break or fail to load. *The strict protection list blocks all known trackers, including analytics trackers, social sharing trackers and advertising trackers as well as content trackers. The strict list will break some videos, photo slideshows, and social networking features. =Change your block list= #Expand the main Firefox menu button [[Image:fx57menu]] and select {menu Content Blocking}. #Select the '''Change block list''' link #Choose the block list you want to use #Select {button Save Changes}. #If you see a dialog box with the message Firefox must restart to change block lists, select {button OK}. ;[[Image:block lists 63]]