for keyboard shortcuts in chrome extensions (allows more than 4)

commander.js

function getTab(sender, count) {
	chrome.tabs.query({
		windowId: sender.tab.windowId
	}, function (tabs) {
		var newTabId = tabs[(((count + sender.tab.index) % tabs.length) + tabs.length) % tabs.length].id;
		return chrome.tabs.update(newTabId, {
			active: true
		});
	});
}
var commander = function commander(command) {
	switch (command) {
	case "invert":
		var style = document.createElement('style')
		style.appendChild(document.createTextNode('body{-webkit-filter:invert(100%);background-color:black;}'))
		document.head.appendChild(style)
	break;
	case "next_tab":
		chrome.tabs.query({
			active: true,
			currentWindow: true
		}, function (tab) {
			return getTab({
				tab: tab[0]
			}, 1);
		});
		break;
	case "prev_tab":
		chrome.tabs.query({
			active: true,
			currentWindow: true
		}, function (tab) {
			return getTab({
				tab: tab[0]
			}, -1);
		});
		break;
	case "close_tab":
		chrome.tabs.query({
			active: true,
			currentWindow: true
		}, function (tab) {
			chrome.tabs.remove(tab[0].id, function () {
				return chrome.runtime.lastError;
			});
		});
		break;
	case "duplicate":
		chrome.tabs.getSelected(null, function (tab) {
			chrome.tabs.duplicate(tab.id);
		});
		break;
	case "extensions":
		chrome.tabs.create({
			url: "chrome://extensions"
		});
		break;
	case "apps":
		chrome.tabs.create({
			url: "chrome://apps"
		});
		break;
	case "bookmarks":
		chrome.tabs.create({
			url: "chrome://bookmarks"
		});
		break;
	case "settings":
		chrome.tabs.create({
			url: "chrome://settings"
		});
		break;
	case "inbox":
		chrome.tabs.create({
			url: "https://mail.google.com/"
		});
		break;
	case "drive":
		chrome.tabs.create({
			url: "https://drive.google.com/"
		});
		break;
	case "music":
		chrome.tabs.create({
			url: "https://play.google.com/music/listen"
		});
		break;
	default:
		break;
	}
};

chrome.commands.onCommand.addListener(commander);

function KeyListener(e, d) {
	var result = "";
	if (e.ctrlKey) {
		result += "ctrl+"
	}
	if (e.altKey) {
		result += "alt+"
	}
	if (e.shiftKey) {
		result += "shift+"
	}
	if (e.metaKey) {
		result += "meta+"
	}
	if (d) {
		groupCollapsed(result + keys[e.which], e.type);
		console.log("which: " + e.which)
		console.log("charCode: " + e.charCode)
		console.log("keyCode: " + e.keyCode)
		console.log("keyIdentifier: " + e.keyIdentifier)
		console.log(e)
		groupEnd();
	}
	return result + keys[e.which];

}
var commands = {
	"ctrl+e": "extensions",
	"ctrl+.": "settings",
	"ctrl+g": "duplicate",
	"ctrl+b": "bookmarks",
	"ctrl+i": "invert",
}


//The key listening event should only be bound to the top window
if (window == top) {
	window.addEventListener("keypress", function (e) {
		console.log(e);
		var seq = KeyListener(e)
		var com = commands[seq]
		if (com) {
			commander(commands[seq], true)
		}
	}, false);
}

chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
	if (request.method == "getLocalStorage") {
		sendResponse({data: localStorage[request.key]});
	}
	else {
		sendResponse({}); // snub them.
	}
});