Chrome Extension storage
Basic Concepts
there are 3 storage area for chrome, sync, local, managed areas. the sync area will be synced with the cloud. managed area is read-only.
all your extension scripts share the same storage, including content scripts, they don't belong to their domain's localStorage.
Usage
chrome.storage.local.get('key', function(data) {});
chrome.storage.local.get(["KEY1", "KEY2"], function(data) {});
chrome.storage.local.set(data, function() {}); // data is key-value pair to store
chrome.storage.local.remove('key', function() {});
chroem.storage.local.remove(["KEY1", "KEY2"], function() {});
chrome.storage.local.clear(function() {});