Browser-level controls are security features that monitor, limit, or block risky actions inside the web browser itself. Instead of waiting for malware to appear on the endpoint, they focus on what happens during the browsing session: opening suspicious sites, using untrusted extensions, transferring data to web apps, or approving dangerous prompts.
They matter because many modern attacks live in the browser and may leave little host-based telemetry for EDR tools to catch. A stolen session, a malicious extension, or a user tricked into authorizing an action can all bypass traditional endpoint signals. Browser-level controls help defend by enforcing policies, checking URLs and downloads, restricting extension behavior, isolating sessions, and recording browser activity for investigation. They do not replace endpoint security, but they add visibility where endpoint-only monitoring is blind.