How to save and read browser extension settings in JS?

Question

JavaScript

For example, if the checkbox is checked, then execute one code, if not, then another.

Answer 1

https://developer.chrome.com/docs/extensions/refer...

Answer 2

You need to store data in a database and not just a database, but preferably in a background process database. For example, I myself always use IndexedDB, it is convenient because you can store anything there - any data type.
PS There is a risk of losing data if the user completely clears the history and cache or reinstalls the extension. If you need high reliability, you can store the data on your server at all, or offer the function of exporting and importing data with a special settings file. I can't say anything about chrome.storage, I've never used it.