diff --git a/umbra/behaviors.d/vimeo.js b/umbra/behaviors.d/vimeo.js
new file mode 100644
index 0000000..dc779c8
--- /dev/null
+++ b/umbra/behaviors.d/vimeo.js
@@ -0,0 +1,7 @@
+//^https?://(?:www\.)?vimeo.com/.*$
+
+var videoElements = document.getElementsByTagName('video');
+for (var i = 0; i < videoElements.length; i++) {
+	videoElements[i].play();
+}
+