[Артист]

Во, всё заработало:

chrome.runtime.onMessage.addListener
(
	function(request, sender, sendResponse)
	{
		switch(request.id)
		{
			case 4: // Получить значение localStorage
			{
				var sid = request.sid
				sendResponse({sid: sid, value: localStorage[sid]})
				return false
				break
			}
			case 6: // Гн 
			{
				var l = localStorage['mercenary_guild']

				if(l != undefined && l > Math.round(Date.now() / 1000)) break

				alert('запрос')
				GetHttpRequest(request.href, {rid: request.rid, response: sendResponse})
				break
			}
		}
		return true
	}
)