Browser Makers Battle Trackers in Privacy Arms Race

Research reveals Meta and Yandex's sneaky use of localhost channels in browsers to share user identifiers. While browsers like DuckDuckGo and Brave effectively blocked this with extensive blocklists, researchers warn this is an ongoing arms race. Chrome, after initially executing the tracking code, recently updated to block the functionality. A long-term solution requires redesigning privacy and security controls for localhost channels, giving users granular control instead of relying on constantly updated blocklists.