diff --git a/js/thread-stats.js b/js/thread-stats.js
index 8873dbdb..a535d499 100644
--- a/js/thread-stats.js
+++ b/js/thread-stats.js
@@ -2,115 +2,138 @@
  * thread-stats.js
  *   - Adds statistics of the thread below the posts area
  *   - Shows ID post count beside each postID on hover
- * 
+ *
  * Usage:
  *   $config['additional_javascript'][] = 'js/jquery.min.js';
  *   $config['additional_javascript'][] = 'js/thread-stats.js';
  */
+
 if (active_page == 'thread') {
-$(document).ready(function(){
-	//check if page uses unique ID
-	var IDsupport = ($('.poster_id').length > 0);
-	var thread_id = (document.location.pathname + document.location.search).split('/');
-	thread_id = thread_id[thread_id.length -1].split('+')[0].split('-')[0].split('.')[0];
-	
-	$('.boardlist.bottom, footer')
-		.first()
-		.before('<div id="thread_stats"></div>');
-	var el = $('#thread_stats');
-	el.prepend(_('Page')+' <span id="thread_stats_page">?</span>');
-	if (IDsupport){
-		el.prepend('<span id="thread_stats_uids">0</span> UIDs |&nbsp;');
-	}
-	el.prepend('<span id="thread_stats_images">0</span> '+_('images')+' |&nbsp;');
-	el.prepend('<span id="thread_stats_posts">0</span> '+_('replies')+' |&nbsp;');
-	delete el;
-	function update_thread_stats(){
-		var op = $('#thread_'+ thread_id +' > div.post.op:not(.post-hover):not(.inline)').first();
-		var replies = $('#thread_'+ thread_id +' > div.post.reply:not(.post-hover):not(.inline)');
-		// post count
-		$('#thread_stats_posts').text(replies.length);
-		// image count
-		$('#thread_stats_images').text(replies.filter(function(){ 
-			return $(this).find('> .files').text().trim() != false; 
-		}).length);
-		// unique ID count
-		if (IDsupport) {
-			var opID = op.find('> .intro > .poster_id').text();
-			var ids = {};
-			replies.each(function(){
-				var cur = $(this).find('> .intro > .poster_id');
-				var curID = cur.text();
-				if (ids[curID] === undefined) {
-					ids[curID] = 0;
-				}
-				ids[curID]++;
-			});
-			if (ids[opID] === undefined) {
-				ids[opID] = 0;
-			}
-			ids[opID]++;
-			var cur = op.find('>.intro >.poster_id');
-			cur.find('+.posts_by_id').remove();
-			cur.after('<span class="posts_by_id"> ('+ ids[cur.text()] +')</span>');
-			replies.each(function(){
-				cur = $(this).find('>.intro >.poster_id');
-				cur.find('+.posts_by_id').remove();
-				cur.after('<span class="posts_by_id"> ('+ ids[cur.text()] +')</span>');
-			});
-			var size = function(obj) {
-				var size = 0, key;
-				for (key in obj) {
-					if (obj.hasOwnProperty(key)) size++;
-				}
-				return size;
-			};
-			$('#thread_stats_uids').text(size(ids));
+	$(document).ready(function() {
+		// Check if page uses unique ID.
+		let idSupport = ($('.poster_id').length > 0);
+		let threadId = (document.location.pathname + document.location.search).split('/');
+		threadId = threadId[threadId.length -1].split('+')[0].split('-')[0].split('.')[0];
+
+		$('.boardlist.bottom, footer')
+			.first()
+			.before('<div id="thread_stats"></div>');
+
+		let el = $('#thread_stats');
+		el.prepend(_('Page')+ ' <span id="thread_stats_page">?</span>');
+		if (idSupport) {
+			el.prepend('<span id="thread_stats_uids">0</span> UIDs |&nbsp;');
 		}
-		var board_name = $('input[name="board"]').val();
-		$.getJSON('//'+ document.location.host +'/'+ board_name +'/threads.json').success(function(data){
-			var found, page = '???';
-			for (var i=0;data[i];i++){
-				var threads = data[i].threads;
-				for (var j=0; threads[j]; j++){
-					if (parseInt(threads[j].no) == parseInt(thread_id)) {
-						page = data[i].page +1;
-						found = true;
+		el.prepend('<span id="thread_stats_images">0</span> ' +_('images')+ ' |&nbsp;');
+		el.prepend('<span id="thread_stats_posts">0</span> ' +_('replies')+ ' |&nbsp;');
+		delete el;
+
+		function updateThreadStats() {
+			let op = $('#thread_' + threadId + ' > div.post.op:not(.post-hover):not(.inline)').first();
+			let replies = $('#thread_' + threadId + ' > div.post.reply:not(.post-hover):not(.inline)');
+			// Post count.
+			$('#thread_stats_posts').text(replies.length);
+			// Image count.
+			$('#thread_stats_images').text(replies.filter(function() {
+				return $(this).find('> .files').text().trim() != false;
+			}).length);
+
+			// Unique ID count.
+			if (idSupport) {
+				let opID = op.find('> .intro > .poster_id').text();
+				let ids = {};
+				replies.each(function() {
+					let cur = $(this).find('> .intro > .poster_id');
+					let curID = cur.text();
+					if (ids[curID] === undefined) {
+						ids[curID] = 0;
+					}
+					ids[curID]++;
+				});
+
+				if (ids[opID] === undefined) {
+					ids[opID] = 0;
+				}
+				ids[opID]++;
+
+				let cur = op.find('>.intro >.poster_id');
+				cur.find(' +.posts_by_id').remove();
+				cur.after('<span class="posts_by_id"> (' + ids[cur.text()] + ')</span>');
+				replies.each(function() {
+					cur = $(this).find('>.intro >.poster_id');
+					cur.find(' +.posts_by_id').remove();
+					cur.after('<span class="posts_by_id"> (' + ids[cur.text()] + ')</span>');
+				});
+				let size = function(obj) {
+					let size = 0;
+					for (key in obj) {
+						if (obj.hasOwnProperty(key)) {
+							size++;
+						}
+					}
+					return size;
+				};
+				$('#thread_stats_uids').text(size(ids));
+			}
+
+			let boardName = $('input[name="board"]').val();
+			$.getJSON('//' + document.location.host + '/' + boardName + '/threads.json').success(function(data) {
+				let found, page = '???';
+				for (let i = 0; data[i]; i++) {
+					let threads = data[i].threads;
+					for (let j = 0; threads[j]; j++) {
+						if (parseInt(threads[j].no) == parseInt(threadId)) {
+							page = data[i].page +1;
+							found = true;
+							break;
+						}
+					}
+					if (found) {
 						break;
 					}
 				}
-				if (found) break;
-			}
-			$('#thread_stats_page').text(page);
-			if (!found) $('#thread_stats_page').css('color','red');
-			else $('#thread_stats_page').css('color','');
-		});
-	}
-	// load the current page the thread is on.
-	// uses ajax call so it gets loaded on a delay (depending on network resources available)
-	var thread_stats_page_timer = setInterval(function(){
-		var board_name = $('input[name="board"]').val();
-		$.getJSON('//'+ document.location.host +'/'+ board_name +'/threads.json').success(function(data){
-			var found, page = '???';
-			for (var i=0;data[i];i++){
-				var threads = data[i].threads;
-				for (var j=0; threads[j]; j++){
-					if (parseInt(threads[j].no) == parseInt(thread_id)) {
-						page = data[i].page +1;
-						found = true;
+				$('#thread_stats_page').text(page);
+				if (!found) {
+					$('#thread_stats_page').css('color', 'red');
+				} else {
+					$('#thread_stats_page').css('color', '');
+				}
+			});
+		}
+
+		// Load the current page the thread is on.
+		// Uses ajax call so it gets loaded on a delay (depending on network resources available).
+		let thread_stats_page_timer = setInterval(function() {
+			let boardName = $('input[name="board"]').val();
+			$.getJSON('//' + document.location.host + '/' + boardName + '/threads.json').success(function(data) {
+				let found = false;
+				let page = '???';
+				for (let i = 0; data[i]; i++) {
+					let threads = data[i].threads;
+					for (let j = 0; threads[j]; j++) {
+						if (parseInt(threads[j].no) == parseInt(threadId)) {
+							page = data[i].page +1;
+							found = true;
+							break;
+						}
+					}
+					if (found) {
 						break;
 					}
 				}
-				if (found) break;
-			}
-			$('#thread_stats_page').text(page);
-			if (!found) $('#thread_stats_page').css('color','red');
-			else $('#thread_stats_page').css('color','');
-		});
-	},30000);
+
+				$('#thread_stats_page').text(page);
+				if (!found) {
+					$('#thread_stats_page').css('color', 'red');
+				} else {
+					$('#thread_stats_page').css('color', '');
+				}
+			});
+		}, 30000);
+
 		$('body').append('<style>.posts_by_id{display:none;}.poster_id:hover+.posts_by_id{display:initial}</style>');
-		update_thread_stats();
-		$('#update_thread').click(update_thread_stats);
-		$(document).on('new_post',update_thread_stats);
-});
+		updateThreadStats();
+		$('#update_thread').click(updateThreadStats);
+		$(document).on('new_post', updateThreadStats);
+	});
 }