--- a/layout/xul/test/window_resizer.xul
+++ b/layout/xul/test/window_resizer.xul
@@ -76,17 +76,17 @@ function doTest() {
   Array.forEach(resizers, function (element) {
     is(getComputedStyle(element, "").cursor,
        element.getAttribute("expectedcursor"),
        "cursor for " + element.dir);
   });
 
   // now check the cursors in rtl. The bottomend resizer
   // should be reversed
-  document.getElementById("bottomend").setAttribute("rtl", "true");
+  document.documentElement.setAttribute("localedir", "rtl");
   Array.forEach(resizers, function (element) {
     is(getComputedStyle(element, "").cursor,
        element.dir == "bottomend" ? "sw-resize" :
          element.getAttribute("expectedcursor"),
        "cursor for " + element.dir);
   });
 
   window.close();

--- a/toolkit/content/widgets/resizer.xml
+++ b/toolkit/content/widgets/resizer.xml
@@ -6,34 +6,11 @@
 
 <bindings id="resizerBindings"
    xmlns="http://www.mozilla.org/xbl">
 
   <binding id="resizer">
     <resources>
       <stylesheet src="chrome://global/skin/resizer.css"/>
     </resources>
-    <implementation>
-      <constructor>
-      <![CDATA[
-        // don't do this for viewport resizers; causes a crash related to
-        // bugs 563665 and 581536 otherwise
-        if (this.parentNode == this.ownerDocument.documentElement)
-          return;
-
-        // if the direction is rtl, set the rtl attribute so that the
-        // stylesheet can use this to make the cursor appear properly
-        var cs = window.getComputedStyle(this);
-        if (cs.writingMode === undefined || cs.writingMode == "horizontal-tb") {
-          if (cs.direction == "rtl") {
-            this.setAttribute("rtl", "true");
-          }
-        } else if (cs.writingMode.endsWith("-rl")) {
-          // writing-modes 'vertical-rl' and 'sideways-rl' want rtl resizers,
-          // as they will appear at the bottom left of the element
-          this.setAttribute("rtl", "true");
-        }
-      ]]>
-      </constructor>
-    </implementation>
   </binding>
 
 </bindings>

--- a/toolkit/themes/osx/global/resizer.css
+++ b/toolkit/themes/osx/global/resizer.css
@@ -20,38 +20,36 @@ resizer {
     background-size: 100% 100%;
   }
 }
 
 resizer[type="window"] {
   display: none;
 }
 
-resizer[rtl="true"],
-resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
+resizer:-moz-locale-dir(rtl) {
   background: url("chrome://global/skin/icons/resizer-rtl.png") no-repeat;
 }
 @media (min-resolution: 2dppx) {
-  resizer[rtl="true"],
-  resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
+  resizer:-moz-locale-dir(rtl) {
     background-image: url("chrome://global/skin/icons/resizer-rtl@2x.png");
     background-size: 100% 100%;
   }
 }
 
 
 resizer[dir="left"],
 resizer[dir="bottomleft"],
 resizer[dir="bottomstart"] {
   transform: scaleX(-1);
 }
 
 resizer[dir="bottomleft"],
-resizer[dir="bottomstart"]:not([rtl="true"]):not(:-moz-locale-dir(rtl)),
-resizer[dir="bottomend"][rtl="true"] {
+resizer[dir="bottomstart"]:not(:-moz-locale-dir(rtl)),
+resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
   cursor: sw-resize;
 }
 
 resizer[dir="top"],
 resizer[dir="bottom"] {
   cursor: ns-resize;
 }
 

--- a/toolkit/themes/windows/global/resizer.css
+++ b/toolkit/themes/windows/global/resizer.css
@@ -8,30 +8,29 @@ resizer {
   -moz-appearance: resizer;
   background: url("chrome://global/skin/icons/resizer.png") no-repeat;
   background-size: 100% 100%;
   cursor: se-resize;
   width: 15px;
   height: 15px;
 }
 
-resizer[rtl="true"],
-resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
+resizer:-moz-locale-dir(rtl) {
   background: url("chrome://global/skin/icons/resizer-rtl.png") no-repeat;
 }
 
 resizer[dir="left"],
 resizer[dir="bottomleft"],
 resizer[dir="bottomstart"] {
   transform: scaleX(-1);
 }
 
 resizer[dir="bottomleft"],
-resizer[dir="bottomstart"]:not([rtl="true"]):not(:-moz-locale-dir(rtl)),
-resizer[dir="bottomend"][rtl="true"] {
+resizer[dir="bottomstart"]:not(:-moz-locale-dir(rtl)),
+resizer[dir="bottomend"]:-moz-locale-dir(rtl) {
   cursor: sw-resize;
 }
 
 resizer[dir="top"],
 resizer[dir="bottom"] {
   cursor: ns-resize;
 }