diff --git a/dom/animation/test/chrome/test_animation_performance_warning.html b/dom/animation/test/chrome/test_animation_performance_warning.html
index c89557a24853..cf38d94dc02f 100644
--- a/dom/animation/test/chrome/test_animation_performance_warning.html
+++ b/dom/animation/test/chrome/test_animation_performance_warning.html
@@ -1180,7 +1180,7 @@ function start() {
     }).then(function() {
       // viewport depends on test environment.
       var expectedWarning = new RegExp(
-        "Animation cannot be run on the compositor because the area of the frame size " +
+        "Animation cannot be run on the compositor because the area of the frame " +
         "\\(\\d+\\) is too large relative to the viewport " +
         "\\(larger than \\d+\\)");
       assert_animation_property_state_equals(
diff --git a/dom/locales/en-US/chrome/layout/layout_errors.properties b/dom/locales/en-US/chrome/layout/layout_errors.properties
index 3ef63f86fceb..2756912c2295 100644
--- a/dom/locales/en-US/chrome/layout/layout_errors.properties
+++ b/dom/locales/en-US/chrome/layout/layout_errors.properties
@@ -12,9 +12,9 @@ TablePartRelPosWarning=Relative positioning of table rows and row groups is now
 ScrollLinkedEffectFound2=This site appears to use a scroll-linked positioning effect. This may not work well with asynchronous panning; see https://developer.mozilla.org/docs/Mozilla/Performance/ScrollLinkedEffects for further details and to join the discussion on related tools and features!
 
 ## LOCALIZATION NOTE(CompositorAnimationWarningContentTooLargeArea):
-## %1$S is an integer value of the area of the frame size
+## %1$S is an integer value of the area of the frame
 ## %2$S is an integer value of the area of a limit based on the viewport size
-CompositorAnimationWarningContentTooLargeArea=Animation cannot be run on the compositor because the area of the frame size (%1$S) is too large relative to the viewport (larger than %2$S)
+CompositorAnimationWarningContentTooLargeArea=Animation cannot be run on the compositor because the area of the frame (%1$S) is too large relative to the viewport (larger than %2$S)
 ## LOCALIZATION NOTE(CompositorAnimationWarningContentTooLarge2):
 ## (%1$S, %2$S) is a pair of integer values of the frame size
 ## (%3$S, %4$S) is a pair of integer values of a limit based on the viewport size