diff --git a/_assets/js/vendor/count.js b/_assets/js/vendor/count.js
index a1efb328b..3b5f6bc87 100644
--- a/_assets/js/vendor/count.js
+++ b/_assets/js/vendor/count.js
@@ -3,10 +3,7 @@
 ;(function() {
 	'use strict';
 
-	if (window.goatcounter && window.goatcounter.vars)  // Compatibility with very old version; do not use.
-		window.goatcounter = window.goatcounter.vars
-	else
-		window.goatcounter = window.goatcounter || {}
+	window.goatcounter = window.goatcounter || {}
 
 	// Load settings from data-goatcounter-settings.
 	var s = document.querySelector('script[data-goatcounter]')
@@ -21,13 +18,14 @@
 	var enc = encodeURIComponent
 
 	// Get all data we're going to send off to the counter endpoint.
-	var get_data = function(vars) {
+	window.goatcounter.get_data = function(vars) {
+		vars = vars || {}
 		var data = {
 			p: (vars.path     === undefined ? goatcounter.path     : vars.path),
 			r: (vars.referrer === undefined ? goatcounter.referrer : vars.referrer),
 			t: (vars.title    === undefined ? goatcounter.title    : vars.title),
 			e: !!(vars.event || goatcounter.event),
-			s: [window.screen.width, window.screen.height, (window.devicePixelRatio || 1)],
+			s: window.screen.width,
 			b: is_bot(),
 			q: location.search,
 		}
@@ -40,6 +38,7 @@
 		if (is_empty(data.r)) data.r = document.referrer
 		if (is_empty(data.t)) data.t = document.title
 		if (is_empty(data.p)) data.p = get_path()
+		if (vars.no_session) data.ns = (typeof(vars.no_session) === 'function' ? vars.no_session(false) : vars.no_session)
 
 		if (rcb) data.r = rcb(data.r)
 		if (tcb) data.t = tcb(data.t)
@@ -84,9 +83,7 @@
 	// Get the endpoint to send requests to.
 	var get_endpoint = function() {
 		var s = document.querySelector('script[data-goatcounter]')
-		if (s && s.dataset.goatcounter)
-			return s.dataset.goatcounter
-		return (goatcounter.endpoint || window.counter)  // counter is for compat; don't use.
+		return (s && s.dataset.goatcounter) ? s.dataset.goatcounter : goatcounter.endpoint
 	}
 
 	// Get current path.
@@ -111,7 +108,7 @@
 	}
 
 	// Filter some requests that we (probably) don't want to count.
-	goatcounter.filter = function() {
+	window.goatcounter.filter = function() {
 		if ('visibilityState' in document && document.visibilityState === 'prerender')
 			return 'visibilityState'
 		if (!goatcounter.allow_frame && location !== parent.location)
@@ -127,7 +124,7 @@
 
 	// Get URL to send to GoatCounter.
 	window.goatcounter.url = function(vars) {
-		var data = get_data(vars || {})
+		var data = window.goatcounter.get_data(vars || {})
 		if (data.p === null)  // null from user callback.
 			return
 		data.rnd = Math.random().toString(36).substr(2, 5)  // Browsers don't always listen to Cache-Control.
@@ -148,7 +145,7 @@
 		if (!url)
 			return warn('not counting because path callback returned null')
 
-		if (!navigator.sendBeacon(url)) {
+		if (!navigator || !navigator.sendBeacon || !navigator.sendBeacon(url)) {
 			// This mostly fails due to being blocked by CSP; try again with an
 			// image-based fallback.
 			var img = document.createElement('img')
@@ -183,10 +180,11 @@
 		var send = function(elem) {
 			return function() {
 				goatcounter.count({
-					event:    true,
-					path:     (elem.dataset.goatcounterClick || elem.name || elem.id || ''),
-					title:    (elem.dataset.goatcounterTitle || elem.title || (elem.innerHTML || '').substr(0, 200) || ''),
-					referrer: (elem.dataset.goatcounterReferrer || elem.dataset.goatcounterReferral || ''),
+					event:      true,
+					path:       (elem.dataset.goatcounterClick || elem.name || elem.id || ''),
+					title:      (elem.dataset.goatcounterTitle || elem.title || (elem.innerHTML || '').substr(0, 200) || ''),
+					referrer:   (elem.dataset.goatcounterReferrer || elem.dataset.goatcounterReferral || ''),
+					no_session: ['1', 't', 'true'].indexOf((elem.dataset.goatcounterNoSession || '').toLowerCase()) !== -1,
 				})
 			}
 		}
@@ -231,7 +229,7 @@
 
 			var p = document.querySelector(opt.append)
 			if (!p)
-				return warn('visit_count: append not found: ' + opt.append)
+				return warn('visit_count: element to append to not found: ' + opt.append)
 			p.appendChild(d)
 		})
 	}
@@ -268,4 +266,4 @@
 			if (!goatcounter.no_events)
 				goatcounter.bind_events()
 		})
-})();
\ No newline at end of file
+})();