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Broken Links and outdated information in Extension FAQ
Describe the bug https://developer.chrome.com/docs/extensions/mv3/faq/
Can extensions store data locally? Yes, extensions can use localStorage to store string data permanently. Using Chrome's built-in JSON functions, you can store complex data structures in localStorage. For extensions that need to execute SQL queries on their stored data, Chrome implements client side SQL databases, which may be used as well.
Looks like WebSQL is on the way out too: https://developer.chrome.com/blog/deprecating-web-sql/
Thanks for raising this. Closing as it looks to have been re-worded. https://developer.chrome.com/docs/extensions/mv3/faq/#faq-dev-08