[https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/ SmartBlock] stands in for common tracking scripts which are blocked by [[Private Browsing - Use Firefox without saving history|private browsing mode]] and [[Enhanced Tracking Protection in Firefox for desktop#w_adjust-your-global-enhanced-tracking-protection-settings|strict tracking protection]]. By doing so it lets pages load more fully, with less breakage, without you having to do anything - all while keeping those tracking scripts blocked. The difference can be dramatic: ;[[Image:Smartblock off|width=400]][[Image:Smartblock on|width=400]] =Disabling SmartBlock - Advanced= If you're a website developer or advanced user wishing to disable SmartBlock, you may do so from the [[Configuration Editor for Firefox|Firefox Configuration Editor]] (about:config page) by setting the preference {pref extensions.webcompat.enable_shims} to {pref false}. Tracking scripts will then continue to be blocked as before.

SmartBlock stands in for common tracking scripts which are blocked by private browsing mode and strict tracking protection. By doing so it lets pages load more fully, with less breakage, without you having to do anything - all while keeping those tracking scripts blocked.

The difference can be dramatic:

Disabling SmartBlock - Advanced

If you're a website developer or advanced user wishing to disable SmartBlock, you may do so from the Firefox Configuration Editor (about:config page) by setting the preference extensions.webcompat.enable_shims to false. Tracking scripts will then continue to be blocked as before.