What is tab isolation in modern browsers and how does it protect the user?

Tab isolation, or the sandbox process, is an architectural approach where each browser tab, extension, and plugin runs in a separate isolated system process with minimal privileges. If a malicious script on an infected page attempts to exploit a zero-day vulnerability in the rendering engine, its capabilities will be strictly limited to the framework of that specific process.

Thanks to this isolation, the attacker will not be able to access the operating system's file system, the memory of other tabs, or the user's confidential data. The operating system acts here as a strict warden that monitors all system calls from each isolated process. Even in the event of a complete crash or compromise of a single tab, the remaining pages in the browser and the operating system itself continue to work stably and securely.

For maximum effectiveness of this technology, developers recommend regularly updating the browser to the latest versions. Modern browsers constantly improve sandbox mechanisms, adding new levels of isolation for various types of content, such as frames, graphic accelerators, and network requests. This creates multi-level protection capable of effectively withstanding even complex multi-vector attacks via the web interface.