The reason safeguarding your data while browsing the Internet is so important lies in how third-party websites track that data-namely, by ingesting bits of your information whenever you embed an image or script from their web page into your own. This sort of referrer trimming removes everything from cross-origin web requests save for the embedding domain itself.

In addition to blocking blacklisted tracking scripts, SmartBlock also has the ability to trim URLs from embedded images and scripts. So far, the teams behind the NoScript and uBlock tools have assisted with developing SmartBlock's capabilities. In fact, the Mozilla team plans to keep improving upon such features that continue to protect users browsing the Web while also maintaining their access to and intended destination web pages. Of course, these replacement scripts do not contain any code that would track the user. SmartBlock operates by providing scripts for the web page that support the site exactly how its original scripts would, so that the web page can render normally without risking user security.

To mitigate the potential obstacle of web page interference, the SmartBlock feature automatically restores websites that have been damaged by other blocking features without disrupting user privacy. As a result, blocking tools can inhibit images, videos and even entire websites from loading. However, in providing these tracker blocking features for Private Browsing and Strict Mode, developers have come to realize that such safety mechanisms can also sometimes block necessary web page function. This block capability helps to prevent cross-site scripting tracking by companies blacklisted by the data protection company, Disconnect. Mozilla began its safe browsing mission in 2015 with the built-in Content Blocking feature that automatically blocks images, scripts and related content from third-party entities.

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