Mozilla this week activated Tracking Protection within Firefox’s Private Browsing mode, which will prevent sites from gathering data about your Web activity.

Available for Windows, Mac, Android, and Linux, Tracking Protection blocks ads, analytics trackers, social share buttons, and other content that may record behavior without your knowledge.

To get started, just launch a new private browsing window, then continue on your merry way. A gray-and-white shield icon in the upper left corner signifies that Firefox is blocking parts of the page.

With Tracking Protection turned on, certain sites might look broken—like pieces are missing or haven’t loaded. To reverse the effects, simply open the new Control Center (accessible via that shield icon), and tap “Disable protection for this session.”

Some pages, meanwhile, could load more quickly when ads and trackers are shut off. “But we don’t think you’ll mind,” Nick Nguyen, vice president of Firefox Product, said in a blog post(Opens in a new window).

Mozilla first tipped Private Browsing mode in August, when it asked pre-beta testers to try it out and provide feedback. It’s now available for everyone in the latest stable release.

Private browsing mode, meanwhile, dates back to 2008. When in use, the browser does not log your activity, so sites visited and passwords typed are not saved. “However, when you browse the Web, you can unknowingly share information about yourself with third parties that are separate from the site you’re actually visiting, even in Private Browsing mode on any browser,” Nguyen wrote. That’s what Tracking Protection aims to prevent.

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Nguyen also detailed a new Firefox Developer Edition(Opens in a new window) with “Animation Tools that work the same way animators think.”