Sir AdGuard is the latest in ad blocking technology. Immunize your system from tens of thousands of adsites, tracking cookies, spyware, Active-X controls, Browser Helper Objects, and more! Sir AdGuard effectively blocks nearly 90% of all web advertisements, thereby boosting browsing speeds. How does it work? Sir AdGuard connects to our weekly updated database of known "bad network sites" and blocks them at a system level, allowing for full compatibility on any web browser.