--- a/dom/animation/test/mochitest.ini
+++ b/dom/animation/test/mochitest.ini
@@ -5,17 +5,17 @@ prefs =
 # Support files for chrome tests that we want to load over HTTP need
 # to go in here, not chrome.ini.
 support-files =
   css-animations/file_animation-starttime.html
   css-animations/file_event-dispatch.html
   chrome/file_animate_xrays.html
   mozilla/xhr_doc.html
   mozilla/file_disable_animations_api_core.html
-  mozilla/file_discrete-animations.html
+  mozilla/file_discrete_animations.html
   mozilla/file_restyles.html
   mozilla/file_transition_finish_on_compositor.html
   ../../../layout/style/test/property_database.js
   testcommon.js
 
 [css-animations/test_animations-dynamic-changes.html]
 [css-animations/test_animation-cancel.html]
 [css-animations/test_animation-computed-timing.html]
@@ -55,23 +55,23 @@ support-files =
 [document-timeline/test_document-timeline.html]
 [document-timeline/test_request_animation_frame.html]
 [mozilla/test_cascade.html]
 [mozilla/test_cubic_bezier_limits.html]
 [mozilla/test_deferred_start.html]
 skip-if = (toolkit == 'android' && debug) || (os == 'win' && bits == 64) || webrender # Bug 1363957; bug 1424752 for webrender
 [mozilla/test_disable_animations_api_core.html]
 [mozilla/test_disabled_properties.html]
-[mozilla/test_discrete-animations.html]
+[mozilla/test_discrete_animations.html]
 [mozilla/test_distance_of_basic_shape.html]
 [mozilla/test_distance_of_filter.html]
 [mozilla/test_distance_of_transform.html]
 [mozilla/test_document_timeline_origin_time_range.html]
 [mozilla/test_hide_and_show.html]
-[mozilla/test_moz-prefixed-properties.html]
+[mozilla/test_moz_prefixed_properties.html]
 [mozilla/test_restyles.html]
 skip-if = webrender # bug 1424752
 [mozilla/test_restyling_xhr_doc.html]
 [mozilla/test_set_easing.html]
 [mozilla/test_transform_limits.html]
 [mozilla/test_transition_finish_on_compositor.html]
 skip-if = toolkit == 'android' || webrender # bug 1424752 for webrender
 [mozilla/test_underlying_discrete_value.html]

rename from dom/animation/test/mozilla/file_discrete-animations.html
rename to dom/animation/test/mozilla/file_discrete_animations.html

rename from dom/animation/test/mozilla/test_discrete-animations.html
rename to dom/animation/test/mozilla/test_discrete_animations.html
--- a/dom/animation/test/mozilla/test_discrete-animations.html
+++ b/dom/animation/test/mozilla/test_discrete_animations.html
@@ -7,11 +7,11 @@
 'use strict';
 setup({explicit_done: true});
 SpecialPowers.pushPrefEnv(
   { "set": [
     ["layout.css.osx-font-smoothing.enabled", true],
     ["layout.css.prefixes.webkit", true]
   ] },
   function() {
-    window.open("file_discrete-animations.html");
+    window.open("file_discrete_animations.html");
   });
 </script>

rename from dom/animation/test/mozilla/test_moz-prefixed-properties.html
rename to dom/animation/test/mozilla/test_moz_prefixed_properties.html