Grist Widget Bridge is a free Chrome extension designed to enable the use of custom Grist widgets hosted on external domains. It addresses two significant challenges: CORS issues and localStorage restrictions, ensuring a seamless user experience. The extension supports multiple Grist instances and allows for the integration of numerous widget origins without manual configuration. Users can quickly add Grist instances or widgets directly from the extension menu, enhancing accessibility and efficiency.

Key features include a native upload bridge that utilizes existing Grist session cookies for attachment submissions, and transparent localStorage proxying that automatically switches to chrome.storage when localStorage is blocked. The extension prioritizes security by limiting its functionality to explicitly configured URLs and ensuring no data is sent to third-party servers. Ideal for developers and users of custom Grist widgets, Grist Widget Bridge simplifies the deployment and testing of widgets across various platforms.