Is BitComet Download Extension safe?

function onLinkClick(event) 
{
	if (bPluginEnabled)
	{
		var linkUrl = this.href;
        var checkResult = checkDownloadLink(linkUrl, sExtFilterList);
        if (checkResult != false) 
        {
    		chrome.runtime.sendMessage({name:"CaptureDownload", link:linkUrl, cookie:document.cookie, referurl:document.location.href});
    		return event.preventDefault();
    	}
	}
}

chrome.runtime.onMessage.addListener(
		function (message, sender, response)
		{
			if (message.name == "CaptureDownload")
			{
				InvokeDownload(message.link, message.cookie, message.referurl);
			}
			else if (message.name == "showFileDownloadNotification")
			{
				showFileDownloadNotification(message.item, message.i18nMessage);
			}
			else if (message.name == "CheckHostConfig")
			{
			    InvokeGetHostConfig();
			}
			else if (message.name === 'setContextMenuTitle') {
				UpdateContextMenuTitle(message.title);
			}
			else if (message.name == "setPluginEnable")
			{
			    SetPluginEnabled(message.value);
			}
			else if (message.name == "launchProgram")
			{
			    InvokeLaunchProgram();
			}
			response(true);
		}
	);

function InvokeDownload(link, cookie, referurl) 
{
	chrome.runtime.sendNativeMessage('com.bitcomet.chrome_extension',
	  { action:"Download", link:link, cookie:cookie, referurl:referurl },
	  function(response) {
		if (chrome.runtime.lastError) {
			console.log("InvokeDownload Error: " + chrome.runtime.lastError.message);
		} else {
			console.log("InvokeDownload Received: " + JSON.stringify(response));
		}
	  });
	return;
}

"content_scripts": 
	[ 
		{
			"js": [ "js/content.js" ],
			"matches": [ "http://*/*", "https://*/*" ]
		} 
	]

function onStartupDownload(info, tab) 
{
	if (info.pageUrl == "chrome://downloads/") {
		chrome.downloads.search(
			{url: info.linkUrl, orderBy: ['-startTime'], limit: 1},
			function(data) {
				var refererUrl = "";
				if (data && data.length > 0) {
					var DownloadItem = data[0];
					refererUrl = DownloadItem.referrer;
				}
				PrepareDownload(info.linkUrl, refererUrl);
			});
	} else {
		PrepareDownload(info.linkUrl, info.pageUrl);
	}
}

function PrepareDownload(link, refererUrl) 
{
	chrome.cookies.getAll({url:link}, function(cookies) {
		var cookie = "";
		for (i in cookies) {
			cookie = cookie.concat(cookies[i].name, "=", cookies[i].value, "; ");
		};
		InvokeDownload(link, cookie, refererUrl);
	});
}

function InvokeDownload(link, cookie, referurl) 
{
	chrome.runtime.sendNativeMessage('com.bitcomet.chrome_extension',
	  { action:"Download", link:link, cookie:cookie, referurl:referurl },
	  function(response) {
		if (chrome.runtime.lastError) {
			console.log("InvokeDownload Error: " + chrome.runtime.lastError.message);
		} else {
			console.log("InvokeDownload Received: " + JSON.stringify(response));
		}
	  });
	return;
}

function CreateContextMenu()
{
	chrome.contextMenus.removeAll(function() {
		chrome.contextMenus.create({id:contextMenuId, type:"normal", title:"Download with BitComet", contexts:["link"], enabled:true});
		chrome.contextMenus.onClicked.addListener((info, tab) => {
			if (info.menuItemId == contextMenuId) {
				onStartupDownload(info, tab);
			}
		});
	});
}

"permissions": 
	[	"contextMenus", 
		"cookies",
		"nativeMessaging",
		"downloads",
		"notifications",
		"storage",
		"alarms"
	],

	"host_permissions": [
		"http://*/*", 
		"https://*/*"
	]