Managing multiple accounts across platforms has become a standard requirement for marketers, advertisers, e-commerce sellers, and growth operators. But doing it safely—without triggering platform security systems—requires more than just switching IPs. Multi-account session management provides a clean, isolated environment for each identity, ensuring fingerprints don’t overlap and accounts don’t “see” each other. This article breaks down how modern session isolation works and why tools like MarketerBrowser have become essential for running large-scale account operations securely and efficiently.