var $db_file = Components.classes["@mozilla.org/file/directory_service;1"].getService(Components.interfaces.nsIProperties).get('ProfD', Components.interfaces.nsIFile);
    $db_file.append("new_db.sqlite");
    
var sqlite = Components.classes["@mozilla.org/storage/service;1"].getService(Components.interfaces.mozIStorageService);
var $db=sqlite.openDatabase($db_file);

var $request=$db.createStatement("CREATE TABLE IF NOT EXISTS test (id TEXT, name TEXT)");
    $request.execute();

var $request=$db.createStatement("INSERT INTO test VALUES ('id_00','English string')");
    $request.execute();
    
var $request=$db.createStatement("INSERT INTO test VALUES ('id_01','Русская строка')");
    $request.execute();
    
var $request=$db.createStatement("SELECT * FROM test");

var str=new String();
    while($request.executeStep())
    {
        let id=$request.row.id;
        let name=$request.row.name;
        str+='id : '+id+'   name : '+name+'\n';
    }
    alert(str);