diff --git a/BirdyNet.py b/BirdyNet.py
index 7cb8c93..22f7444 100644
--- a/BirdyNet.py
+++ b/BirdyNet.py
@@ -28,9 +28,9 @@ import configparser
 import json
 import time
 import html
-browserWindows = []
-
+import threading
 os.chdir(sp)
+
 distro = os.path.splitext(s.rsplit(os.path.sep)[-1])[0]
 version = {
 	"major": 0,
@@ -41,6 +41,9 @@ version = {
 versionString = ".".join(map(str,[version["major"],version["minor"]]))
 versionStringExt = ".".join(map(str,[version["major"],version["minor"],version["patch"]])) + " " + version["stage"]
 
+browserWindows = []
+browserWindowsLock = threading.Lock()
+
 def runCode(str, lcs = False, description = "loose-code"):
 	if lcs == False: lcs = {}
 	code = compile(str,description,"exec")
@@ -131,8 +134,10 @@ class browserWindow(QMainWindow):
 		self.cResizeElements()
 	
 	def closeEvent(self,event):
+		browserWindowsLock.acquire()
 		browserWindows.remove(self)
-		event.accept()
+		self.destroy()
+		browserWindowsLock.release()
 	
 	def cNavigate(self,event = None):
 		try:
@@ -140,7 +145,7 @@ class browserWindow(QMainWindow):
 			self.cStatusBar.showMessage("Downloading...")
 			self.update()
 			start = time.time()
-			response = downloadPage(self.cUrlBar.text(),{"User-Agent": self.cUserAgent})
+			response = downloadPage(self.cUrlBar.text(),[("User-Agent",self.cUserAgent)])
 			self.cUrlBar.setText(response["url"])
 			end = time.time()
 			print("Downloading page: " +str(end - start))
@@ -160,13 +165,14 @@ class browserWindow(QMainWindow):
 			#print(prettyJson(response["headers"]))
 		except Exception as e:
 			self.cDoc.cRenderHtml(html.escape(str(e)))
-			self.cDoc.cRenderHtml(str(e))
 			raise
 	
 	def cNewWindow(self):
 		w = browserWindow()
+		browserWindowsLock.acquire()
 		browserWindows.append(w)
 		w.show()
+		browserWindowsLock.release()
 
 def main():
 	# load program default addons
@@ -198,7 +204,9 @@ def main():
 		app.setWindowIcon(QtGui.QIcon("assets/BirdyNet-XP.ico"))
 	except Exception as e:
 		print("Could not set window icon: " +print(e))
+	browserWindowsLock.acquire()
 	browserWindows.append(browserWindow())
+	browserWindowsLock.release()
 	sys.exit(app.exec_())