A browser extension "that encrypts your communications with many major websites, making your browsing more secure." (Note: Increasingly, this functionality is being integrated into browser software. Eventually, this extension will obsolesce.)
"Privacy Badger is a browser add-on that stops advertisers and other third-party trackers from secretly tracking where you go and what pages you look at on the web."
Use public networks securely and prevent tracking by setting up a VPN on your computer and cell phone. (Note: choose a VPN carefully because you are trusting it with your data. Some VPNs are not trustworthy.)
"Defend yourself against tracking and surveillance. Circumvent censorship." This is not for everybody, only for the most privacy- and security-conscious users.
Install the DuckDuckGo Privacy Browser app onto your cell phone and tablet. Prevent online trackers and ads. Use this browser instead Chrome, Safari, and Edge.
Ecosia plants trees, doesn't permanently store your searches, doesn't sell data to advertisers, doesn't use external tracking tools (i.e. Google Analytics), and you can turn off all tracking