diff --git a/DEVELOP.md b/DEVELOP.md
index 09baa07..3154bce 100644
--- a/DEVELOP.md
+++ b/DEVELOP.md
@@ -161,24 +161,6 @@ e.g. `./tests/pdifftests/run.sh -d chrome` to run with the Chrome driver, or
 `./tests/pdifftests/run.sh -c examine -f base` to filter the tests to those in
 the 'examine' class with 'base' in their name.
 
-Depnding on your version of firefox, you may find it useful to specify the path
-to the binary you'd like the tests to run on with `--firefox-path` (you can also
-set this in `.seltestrc`, see
-[the github page for seltest](https://github.com/ihodes/seltest)).
-
-Our tests are generated with Firefox
-[release 34](https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/34.0/), on
-OSX. You can download this, save it somewhere (maybe in your virtualenv folder),
-and then point `seltest` to it like so, in `~/.seltestrc`:
-
-```
-[arguments]
---firefox-path=~/directory/to/Firefox.app/Contents/MacOS/firefox-bin
-```
-
-Be sure to turn off auto-update in Firefox preferences if you plan on opening
-it. Seltest will automatically disable updates when running tests.
-
 To determine whether there are any pixels that have changed before/after, and to
 generate a perceptual diff that will make it clear where the changes are, you
 can use [webdiff](https://github.com/danvk/webdiff): `git webdiff`.
diff --git a/cycledash/static/js/examine/RecordStore.js b/cycledash/static/js/examine/RecordStore.js
index cf44e5a..ed07ff5 100644
--- a/cycledash/static/js/examine/RecordStore.js
+++ b/cycledash/static/js/examine/RecordStore.js
@@ -114,7 +114,7 @@ function createRecordStore(run, igvHttpfsUrl, dispatcher, opt_testDataSource) {
     // Required: lets the dispatcher know that the Store is done processing.
     return true;
   }
-  if (dispatcher) dispatcherToken = dispatcher.register(receiver);
+  if (dispatcher)  dispatcherToken = dispatcher.register(receiver);
 
   /**
    * Queries the backend for the set of genotypes matching the current
@@ -122,7 +122,7 @@ function createRecordStore(run, igvHttpfsUrl, dispatcher, opt_testDataSource) {
    *
    * NB: mutates store state!
    */
-  function _updateGenotypes({append}) {
+  function updateGenotypes({append}) {
     // Example query:
     // {"range": {"contig": 1, "start": 800000, "end": 2000000},
     //  "sortBy": [{"columnName": "sample:DP", "order": "desc"},
@@ -154,9 +154,6 @@ function createRecordStore(run, igvHttpfsUrl, dispatcher, opt_testDataSource) {
     notifyChange();  // notify of pending request
     deferredGenotypes(vcfId, query)
       .done(response => {
-        if (!_.isEqual(currentPendingQuery, query)) {
-          return;  // A subsequent request has superceded this one.
-        }
         if (append) {
           _.extend(keyToRecordIndex,
                    generateKeyToRecordIndex(response.records, records.length));
@@ -180,8 +177,6 @@ function createRecordStore(run, igvHttpfsUrl, dispatcher, opt_testDataSource) {
         notifyChange();
       });
   }
-  var updateGenotypes =
-      _.debounce(_.throttle(_updateGenotypes, 500 /* ms */), 500 /* ms */);
 
   // Ignore all currently pending requests (presumably because there's a newer one).
   function ignorePendingRequests() {
@@ -426,8 +421,7 @@ function createRecordStore(run, igvHttpfsUrl, dispatcher, opt_testDataSource) {
     }
   }
 
-  // There's no need to debounce this update -- make it so now!
-  _updateGenotypes({append: false});
+  updateGenotypes({append: false});
   getComments();
 
   function notifyChange() {
diff --git a/tests/pdifftests/README.md b/tests/pdifftests/README.md
index 4b15c22..76a946a 100644
--- a/tests/pdifftests/README.md
+++ b/tests/pdifftests/README.md
@@ -1,14 +1,15 @@
-Notes on working with image diff tests
---------------------------------------
+Notes on working with perceptual diff tests
+-------------------------------------------
 
-There are some notes in [DEVELOP.md](/DEVELOP.md) about how to run the dpxdt tests to
-check for changes. This document describes how to update and extend them.
+There are some notes in [DEVELOP.md](/DEVELOP.md) about how to run the
+perceptual diff tests to check for changes. This document describes how to
+update and extend them.
 
 CycleDash requires a PostgreSQL database to run, and a rabbitmq workqueue to
 process new inputs. For the tests to be reproducible, it needs its own
 instances of each of these.
 
-You must have postgres running to update the dpxdt tests, e.g. by running:
+You must have Postgres running to update the tests, e.g. by running:
 
     postgres -D /usr/local/var/postgres
 
diff --git a/tests/pdifftests/images/examine_bad-query.png b/tests/pdifftests/images/examine_bad-query.png
index 5afbaec..0078701 100644
Binary files a/tests/pdifftests/images/examine_bad-query.png and b/tests/pdifftests/images/examine_bad-query.png differ
diff --git a/tests/pdifftests/images/examine_base.png b/tests/pdifftests/images/examine_base.png
index eedf792..65c640b 100644
Binary files a/tests/pdifftests/images/examine_base.png and b/tests/pdifftests/images/examine_base.png differ
diff --git a/tests/pdifftests/images/examine_comments-edit.png b/tests/pdifftests/images/examine_comments-edit.png
index b2e641e..4674fea 100644
Binary files a/tests/pdifftests/images/examine_comments-edit.png and b/tests/pdifftests/images/examine_comments-edit.png differ
diff --git a/tests/pdifftests/images/examine_comments-view.png b/tests/pdifftests/images/examine_comments-view.png
index b4a4cc5..3ec079f 100644
Binary files a/tests/pdifftests/images/examine_comments-view.png and b/tests/pdifftests/images/examine_comments-view.png differ
diff --git a/tests/pdifftests/images/examine_filter.png b/tests/pdifftests/images/examine_filter.png
index 4a7c673..f5a384c 100644
Binary files a/tests/pdifftests/images/examine_filter.png and b/tests/pdifftests/images/examine_filter.png differ
diff --git a/tests/pdifftests/images/examine_sorted.png b/tests/pdifftests/images/examine_sorted.png
index eedf792..d8873fd 100644
Binary files a/tests/pdifftests/images/examine_sorted.png and b/tests/pdifftests/images/examine_sorted.png differ
diff --git a/tests/pdifftests/images/examine_tooltip.png b/tests/pdifftests/images/examine_tooltip.png
index dd1b537..c8c11e4 100644
Binary files a/tests/pdifftests/images/examine_tooltip.png and b/tests/pdifftests/images/examine_tooltip.png differ
diff --git a/tests/pdifftests/images/examine_validation.png b/tests/pdifftests/images/examine_validation.png
index e21692a..6d41909 100644
Binary files a/tests/pdifftests/images/examine_validation.png and b/tests/pdifftests/images/examine_validation.png differ
diff --git a/tests/pdifftests/images/runs_info.png b/tests/pdifftests/images/runs_info.png
index c686d2e..9a6ea83 100644
Binary files a/tests/pdifftests/images/runs_info.png and b/tests/pdifftests/images/runs_info.png differ
diff --git a/tests/pdifftests/images/runs_page.png b/tests/pdifftests/images/runs_page.png
index 0701387..af156ae 100644
Binary files a/tests/pdifftests/images/runs_page.png and b/tests/pdifftests/images/runs_page.png differ
diff --git a/tests/pdifftests/images/website_comments.png b/tests/pdifftests/images/website_comments.png
index 875a0a5..e1e596f 100644
Binary files a/tests/pdifftests/images/website_comments.png and b/tests/pdifftests/images/website_comments.png differ
diff --git a/tests/pdifftests/run.sh b/tests/pdifftests/run.sh
index 9e2333f..1edfdae 100755
--- a/tests/pdifftests/run.sh
+++ b/tests/pdifftests/run.sh
@@ -1,8 +1,15 @@
-#!/usr/bin/env sh
+#!/bin/bash
+
 source tests/ENV.sh
+
 python run.py > tests/pdifftests/log.txt 2>&1 &
 RUN_PID=$!
 echo pid of test server is $RUN_PID
 echo logging to tests/pdifftests/log.txt
+
+function finish {
+    kill $RUN_PID
+}
+trap finish EXIT
+
 sel update -b phantomjs -o tests/pdifftests/images "$@" tests/pdifftests
-kill $RUN_PID
diff --git a/tests/pdifftests/test.py b/tests/pdifftests/test.py
index fda021d..877f3cc 100644
--- a/tests/pdifftests/test.py
+++ b/tests/pdifftests/test.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from seltest import url, waitfor, Base
+from seltest import url, waitfor, dontwaitfor, Base
 from selenium.webdriver.support.ui import Select
 from selenium.webdriver.common.action_chains import ActionChains
 
@@ -45,6 +45,7 @@ def bams(self, driver):
 class Examine(Base):
     window_size = [1280, 800]
     base_url = BASE + '/runs/1/examine'
+    wait_for = {'css_selector': '.query-status', 'classes': ['good']}
 
     def base(self, driver):
         """Initial view of a fully-loaded Examine page."""
@@ -59,7 +60,7 @@ def sorted(self, driver):
     @waitfor('[data-attribute="info:DP"] .tooltip')
     def tooltip(self, driver):
         """Examine page showing a Normal Read Depth tooltip."""
-        dp = driver.find_element_by_css_selector('[data-attribute="info:DP"]')
+        dp = driver.find_element_by_css_selector('[data-attribute="sample:RD"]')
         hover = ActionChains(driver).move_to_element(dp)
         hover.perform()
 
@@ -81,6 +82,8 @@ def comments_edit(self, driver):
         assert btn.text.lower() == 'edit'
         btn.click()
 
+    @dontwaitfor('.query-status')
+    @waitfor('.query-status', classes=['bad'])
     def bad_query(self, driver):
         """Examine page showing a poorly formed query."""
         input = driver.find_element_by_css_selector('input[type="text"].tt-input')