diff --git a/background.js b/background.js
index b9d220b..57779c8 100644
--- a/background.js
+++ b/background.js
@@ -216,7 +216,7 @@ function isCoolUrl(url, callback) {
 	var extensionIndex = url.lastIndexOf('.');
 	var extension = cleanExtension(url.substr(extensionIndex + 1));
 	
-	var validExtensions = ["jpg", "jpeg", "png", "gif", "webm", "gifv", "mp4", "mp3", "ogg", "opus", "pdf", "mkv", "ogv"];
+	var validExtensions = ["jpg", "jpeg", "png", "gif", "webm", "gifv", "mp4", "mp3", "ogg", "opus", "pdf", "mkv", "ogv", "swf", "flv"];
 
 	chrome.storage.sync.get({ disableblacklist: false }, function(config) {
 		if(!config.disableblacklist) {