diff --git a/umbra/behaviors.d/instagram.js b/umbra/behaviors.d/instagram.js
new file mode 100644
index 0000000..b89685b
--- /dev/null
+++ b/umbra/behaviors.d/instagram.js
@@ -0,0 +1,78 @@
+// {"url_regex":"^https?://(?:www\\.)?instagram\\.com/.*$", "request_idle_timeout_sec":10}
+//
+// vim:set sw=8 et:
+//
+
+var umbraState = {'idleSince':null,'done':null};
+
+
+var intervalID = setInterval(scrollInterval,50);
+var images;
+var imageID=0;
+var imageCount=0;
+function scrollInterval() {
+   scroll();
+
+   //if not at the bottom
+   if(window.scrollY + window.innerHeight < document.documentElement.scrollHeight) {
+       umbraState.idleSince=Date.now();
+   }
+   else {
+	var more = document.querySelectorAll("span.more-photos a.more-photos-enabled");
+	if(more.length>0) {
+	    more[0].click();
+	    umbraState.idleSince=Date.now();
+	}
+	else if(document.querySelectorAll("span.more-photos a.more-photos-disabled").length>0) { //finally done scrolling/loading
+	    clearInterval(intervalID);
+	    umbraState.idleSince=null;
+	    images = document.querySelectorAll("li.photo div.photo-wrapper a.bg[data-reactid]");
+	    if(images && images !=='undefined' && images.length>0 ) {
+		images[0].click();
+		imageID++;
+		imageCount=images.length;
+	    }
+	    intervalID = setInterval(clickPhotosInterval,200);
+	}
+   }
+}
+
+function clickPhotosInterval() {
+    rightArrow = document.querySelectorAll("a.mmRightArrow");
+    
+    if(imageID>=imageCount) {
+	clearInterval(intervalID);
+	umbraState.done=true;
+	umbraState.idleSince=(Date.now()-50000);//ready to exit
+    }
+    else {
+	rightArrow[0].click();
+	imageID++;
+	umbraState.idleSince=Date.now();
+    }
+}
+
+function scroll() {
+    window.scrollBy(0,50);
+}
+
+
+// If we haven't had anything to do (scrolled, clicked, etc) in this amount of
+// time, then we consider ourselves finished with the page.
+
+var UMBRA_USER_ACTION_IDLE_TIMEOUT_SEC = 10;
+
+// Called from outside of this script.
+var umbraBehaviorFinished = function() {
+    if(umbraState.done!=null && umbraState.done==true) {
+	return true;
+    }
+    if (umbraState.idleSince != null) {
+	var idleTimeMs = Date.now() - umbraState.idleSince;
+	if (idleTimeMs / 1000 > UMBRA_USER_ACTION_IDLE_TIMEOUT_SEC) {
+	    return true;
+	}
+    }
+    return false;
+}
+