uBlock Origin is my #1 recommended web browser plugin. uBlock Origin drastically reduces the amount of tracking and data gathering a website can obtain from you and blocks most ads! uBlock Origin is FREE, won’t slow down your web browsing experience, and outperforms any of the market’s paid blockers today.
Although uBlock Origin is primarily an adblocker, its script-blocking features improve your security by preventing malicious and insecure scripts from running. With its default blocklists, many tracking and ad services greatly improve your privacy as you browse the web.