Browser Extension Basics
Security-focused browser extensions are a common companion to a full desktop security program. Here's the general concepts behind what this category of extension typically covers.
Malicious Site Blocking
Aims to flag or block known scam, phishing, and malware-distributing websites before you visit them.
Ad & Tracker Blocking
Commonly blocks intrusive ads and third-party trackers that would otherwise follow your browsing across sites.
Tech-Support Scam Detection
Aims to catch fake "your computer is infected" pop-ups and scareware pages designed to trick people into calling a fake support number.
How this differs from a full desktop security program
A browser extension generally protects what happens within the browser itself — sites you visit, scripts that run on pages, and downloads initiated through the browser. A full desktop security program typically also protects the operating system and files outside the browser, which a browser extension alone doesn't cover.
Exact features and browser compatibility vary by product and version — check the official extension listing for what's currently supported.