Where to store the state of the Chrome extension?

Storage - with access from any extension script (without message transfers between background and injected js).

chrome.storage.local - for local storage:

record :

 var a = {}; a["имя_ключа1"] = "Значение1"; a["имя_ключа2"] = "Значение2"; chrome.storage.local.set(a); 

reading :

 var a = ["имя_ключа1", "имя_ключа2"]; chrome.storage.local.get(a, function(b) { var result1 = b["имя_ключа1"]; var result2 = b["имя_ключа2"] }); 

chrome.storage.sync - for synchronized data storage:

record :

 var a = {}; a["имя_ключа1"] = "Значение1"; a[имя_ключа2] = "Значение2"; chrome.storage.sync.set(a); 

reading :

 var a = ["имя_ключа1", "имя_ключа2"]; chrome.storage.sync.get(a, function(b) { var result1 = b["имя_ключа1"], var result2 = b["имя_ключа2"] });