Browser Extension Storage Using Iframes for Cross-Domain Sync

The patent introduces a browser extension as an intermediary component that mediates between first-party and third-party domains. The extension hosts a cross-domain storage mechanism that both domains can access through controlled interfaces, enabling data sharing without direct third-party cookie access. This intermediary architecture maintains security by keeping the storage mechanism within the browser's trusted extension environment rather than allowing external domains to directly set cookies.

The patent implements preliminary action by obtaining user permission once during the initial interaction with the first-party domain. The browser extension stores this permission and automatically manages cross-domain access thereafter, eliminating the need for repeated user interactions. The system proactively handles domain verification and access control in the background, reducing operational complexity for users while maintaining reliable domain control.

The patent implements a universal cross-domain storage mechanism hosted by the browser extension that serves multiple domains simultaneously. Rather than creating separate storage systems for each domain pair, the extension provides a single unified storage interface that any authorized domain can access. This multi-functional approach reduces overall system complexity by consolidating the storage infrastructure into one shared resource managed by the extension.