diff --git a/background.js b/background.js
index 611f282..e410d0e 100644
--- a/background.js
+++ b/background.js
@@ -87,7 +87,7 @@ function isCoolUrl(url) {
 	var extensionIndex = url.lastIndexOf('.');
 	var extension = url.substr(extensionIndex + 1);
 
-	var validExtensions = ["jpg", "jpeg", "png", "gif", "webm", "gifv"];
+	var validExtensions = ["jpg", "jpeg", "png", "gif", "webm", "gifv", "mp4", "mp3", "ogg", "opus"];
 
 	var blackList = ["pomf", "mixtape.moe", "catgirlsare.sexy", "cocaine.ninja"];