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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.

Content blocking is a collection of Firefox settings that allow you to block content that affects browsing performance and privacy. Starting in 63, content blocking includes the feature previously called Tracking Protection, which blocks all detected trackers, and a new feature that blocks just those trackers that cause pages to load slowly. When Firefox detects content that can be blocked, a shield icon [[Image: FirefoxShieldIcon]] will appear in your address bar. ;[[Image:content blocking url 63]] Click the shield icon to expand the control center panel and get more information about the type of content Firefox has detected as well as manage settings for individual sites. ;[[Image:content blocking 63 details]] __TOC__ =Turn content blocking on or off= By default, Firefox blocks trackers only in private browsing. You can modify this in preferences so that Firefox blocks trackers all the time, blocks just those that load slowly, or does not block trackers at all. #[[Template:optionspreferences]] #Select the Privacy & Security section on the left. Content Blocking appears at the top of this page. #;[[Image:content blocking privacy panel 63]] =Turn off content blocking for 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 [[Image:FirefoxShieldIcon]] will appear when Firefox is actively blocking content on a page. Select the shield icon to expand the control center panel. #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:content blocking 63 details]] =Content blocking in private browsing= Since private browsing doesn’t keep any 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 private browsing. =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= #[[Template:optionspreferences]] #Select ''Privacy & Security'' section on the left. Content Blocking appears at the top of this page. #Select the '''Change block list''' link, choose the block list you want to use, and save your changes. #You will see a dialog box with the message Firefox must restart to change block lists. #Select {button OK}. #;[[Image:block lists 63]]