fixed bug when running on browsers :about pages

.gitignore

@@ -1,6 +1,7 @@
 # Logs
 logs
 *.log
+.DS_Store
 
 # Editor Project Files
 *.sublime-project

dist/performanceBookmarklet.js

@@ -12,7 +12,7 @@ Initiallize Bookmarklet wide variables, holders and helpers - all other files on
 */
 
 //bookmarklet wide vars
-var tablesToLog = [],	
+var tablesToLog = [],
 	resources,
 	allResourcesCalc,
 	marks,
@@ -23,6 +23,10 @@ var tablesToLog = [],
 	outputHolder,
 	outputContent;
 
+//skip browser internal pages
+if(location.protocol === "about:"){
+	return;
+}
 
 //feature check gate
 if(window.performance && window.performance.getEntriesByType !== undefined) {
@@ -341,47 +345,61 @@ Tiles to summarize page performance
 
 
 onIFrameLoaded(function(){
+	var requestsOnly,
+		requestsByDomain,
+		currAndSubdomainRequests,
+		crossDocDomainRequests,
+		hostRequests,
+		hostSubdomains,
+		slowestCalls,
+		average,
+		createTile,
+		createAppendixDefValue,
+		tilesHolder,
+		appendix;
 
 	//filter out non-http[s] and sourcemaps
-	var requestsOnly = allResourcesCalc.filter(function(currR) {
+	requestsOnly = allResourcesCalc.filter(function(currR) {
 		return currR.name.indexOf("http") === 0 && !currR.name.match(/js.map$/);
 	});
 
-	var requestsByDomain = getItemCount(requestsOnly.map(function(currR, i, arr){
+	requestsByDomain = getItemCount(requestsOnly.map(function(currR, i, arr){
 		return currR.domain;
 	}), "domain");
 
-	var currAndSubdomainRequests = requestsOnly.filter(function(domain){
+	currAndSubdomainRequests = requestsOnly.filter(function(domain){
 		return domain.domain.split(".").slice(-2).join(".") === location.host.split(".").slice(-2).join(".");
 	}).length;
 
-	var crossDocDomainRequests = requestsOnly.filter(function(domain){
+	crossDocDomainRequests = requestsOnly.filter(function(domain){
 		return !endsWith(domain.domain, document.domain);
 	}).length;
 
-	var hostRequests = requestsOnly.filter(function(domain){
+	hostRequests = requestsOnly.filter(function(domain){
 		return domain.domain === location.host;
 	}).length;
 
-	var hostSubdomains = requestsByDomain.filter(function(domain){
+	hostSubdomains = requestsByDomain.filter(function(domain){
 		return endsWith(domain.domain, location.host.split(".").slice(-2).join(".")) && domain.domain !== location.host;
 	}).length;
 
-	var slowestCalls = allResourcesCalc.filter(function(a){
-		return a.name !== location.href;
-	}).sort(function(a, b) {
-		return b.duration - a.duration;
-	});
+	if(allResourcesCalc.length > 0){
+		slowestCalls = allResourcesCalc.filter(function(a){
+			return a.name !== location.href;
+		}).sort(function(a, b) {
+			return b.duration - a.duration;
+		});
 
-	var average = Math.floor(slowestCalls.reduceRight(function(a,b){
-		if(typeof a !== "number"){
-			return a.duration + b.duration
-		}
-		return a + b.duration;
-	}) / slowestCalls.length);
+		average = Math.floor(slowestCalls.reduceRight(function(a,b){
+			if(typeof a !== "number"){
+				return a.duration + b.duration
+			}
+			return a + b.duration;
+		}) / slowestCalls.length);
+	}
 
 
-	var createTile = function(title, value, titleFontSize){
+	createTile = function(title, value, titleFontSize){
 		titleFontSize = titleFontSize || 60;
 		var dl = newTag("dl", {
 			class : "summary-tile"
@@ -391,12 +409,12 @@ onIFrameLoaded(function(){
 		return dl;
 	};
 
-	var createAppendixDefValue = function(a, definition, value){
+	createAppendixDefValue = function(a, definition, value){
 		a.appendChild(newTag("dt", {html : definition}));
 		a.appendChild(newTag("dd", {html : value}));
 	};
 
-	var tilesHolder = newTag("div", {
+	tilesHolder = newTag("div", {
 		class : "tiles-holder"
 	});
 
@@ -409,10 +427,13 @@ onIFrameLoaded(function(){
 	tilesHolder.appendChild(createTile("Time to First Byte", perfTiming.responseStart - perfTiming.navigationStart + "ms", 40));
 	tilesHolder.appendChild(createTile("<span title=\"domLoading to domContentLoadedEventStart\">DOM Content Loading</span>", perfTiming.domContentLoadedEventStart - perfTiming.domLoading + "ms", 40));
 	tilesHolder.appendChild(createTile("<span title=\"domLoading to loadEventStart\">DOM Processing</span>", perfTiming.domComplete - perfTiming.domLoading + "ms", 40));
-	tilesHolder.appendChild(createTile("<span title=\"" + slowestCalls[0].name +"\">Slowest Call</span>", "<span title=\"" + slowestCalls[0].name +"\">"+ Math.floor(slowestCalls[0].duration) + "ms</span>", 40));
-	tilesHolder.appendChild(createTile("Average Call", average + "ms", 40));
+
+	if(allResourcesCalc.length > 0){
+		tilesHolder.appendChild(createTile("<span title=\"" + slowestCalls[0].name +"\">Slowest Call</span>", "<span title=\"" + slowestCalls[0].name +"\">"+ Math.floor(slowestCalls[0].duration) + "ms</span>", 40));
+		tilesHolder.appendChild(createTile("Average Call", average + "ms", 40));
+	}
 
-	var appendix = newTag("dl", {
+	appendix = newTag("dl", {
 		class : "summary-tile-appendix"
 	});