--- a/dom/animation/test/chrome/test_animation_performance_warning.html
+++ b/dom/animation/test/chrome/test_animation_performance_warning.html
@@ -1175,17 +1175,17 @@ function start() {
       assert_animation_property_state_equals(
         animation.effect.getProperties(),
         [ { property: 'transform', runningOnCompositor: true } ]);
       animation.effect.target.style = 'width: 5200px; height: 5200px';
       return waitForFrame();
     }).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(
         animation.effect.getProperties(),
         [ {
           property: 'transform',
           runningOnCompositor: false,
           warning: expectedWarning

--- a/dom/locales/en-US/chrome/layout/layout_errors.properties
+++ b/dom/locales/en-US/chrome/layout/layout_errors.properties
@@ -7,19 +7,19 @@ ImageMapCircleWrongNumberOfCoords=The “coords” attribute of the <area shape="circle"> tag is not in the “center-x,center-y,radius” format.
 ImageMapCircleNegativeRadius=The “coords” attribute of the <area shape="circle"> tag has a negative radius.
 ImageMapPolyWrongNumberOfCoords=The “coords” attribute of the <area shape="poly"> tag is not in the “x1,y1,x2,y2 …” format.
 ImageMapPolyOddNumberOfCoords=The “coords” attribute of the <area shape="poly"> tag is missing the last “y” coordinate (the correct format is “x1,y1,x2,y2 …”).
 
 TablePartRelPosWarning=Relative positioning of table rows and row groups is now supported. This site may need to be updated because it may depend on this feature having no effect.
 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$S) is a pair of integer values of a limit based on the viewport size
 ## (%5$S, %6$S) is a pair of integer values of an absolute limit
 CompositorAnimationWarningContentTooLarge2=Animation cannot be run on the compositor because the frame size (%1$S, %2$S) is too large relative to the viewport (larger than (%3$S, %4$S)) or larger than the maximum allowed value (%5$S, %6$S)
 ## LOCALIZATION NOTE(CompositorAnimationWarningTransformBackfaceVisibilityHidden):
 ## 'backface-visibility: hidden' is a CSS property, don't translate it.
 CompositorAnimationWarningTransformBackfaceVisibilityHidden=Animations of ‘backface-visibility: hidden’ transforms cannot be run on the compositor