Fixed issue reporter`s progress labels for right-to-left languages

chrome/content/ui/progressBar.js

Index: chrome/content/ui/progressBar.js
===================================================================
--- a/chrome/content/ui/progressBar.js
+++ b/chrome/content/ui/progressBar.js
@@ -1,17 +1,17 @@
 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 (function()
 {
-  let progressBar, canvas, headers;
+  let progressBar, canvas, headers, isRTL;
 
   function onLoad()
   {
     window.removeEventListener("load", onLoad, false);
 
     // Init global variables
     progressBar = document.getElementById("progressBar");
     canvas = document.getElementById("progressBarCanvas");
@@ -21,16 +21,18 @@
       canvas.parentNode.appendChild(headers[i]);
 
     // Expose properties
     progressBar.__defineGetter__("activeItem", getActiveItem);
     progressBar.__defineSetter__("activeItem", setActiveItem);
     progressBar.__defineGetter__("activeItemComplete", getActiveItemComplete);
     progressBar.__defineSetter__("activeItemComplete", setActiveItemComplete);
 
+    isRTL = (window.getComputedStyle(document.documentElement).direction == "rtl");
+
     // Run actual drawing delayed, once the sizes are fixed
     window.setTimeout(init, 0);
   };
   window.addEventListener("load", onLoad, false);
 
   function init()
   {
     const gapWidth = 5;
@@ -38,16 +40,21 @@
 
     let width = canvas.width = canvas.offsetWidth;
     let height = canvas.height = canvas.offsetHeight;
 
     let context = canvas.getContext("2d");
     context.fillStyle = window.getComputedStyle(progressBar, "").color;
     context.strokeStyle = window.getComputedStyle(progressBar, "").color;
     context.lineWidth = 1;
+    if (isRTL)
+    {
+      context.translate(width, 0);
+      context.scale(-1, 1);
+    }
 
     let panelCount = headers.length;
     let panelWidth = (width - gapWidth * (panelCount - 1) - 1) / panelCount;
     for (let i = 0; i < panelCount; i++)
     {
       context.save();
       context.translate(Math.round(i * (panelWidth + gapWidth)) + 0.5, 0.5);
       context.beginPath();
@@ -64,24 +71,25 @@
         context.lineTo(0, (height - 1) / 2);
         context.lineTo(-arrowheadWidth, 0);
       }
       else
       {
         context.lineTo(0, height - 1);
         context.lineTo(0, 0);
       }
+
       context.stroke();
       context.restore();
 
       let childLeft = Math.round(i * (panelWidth + gapWidth) + 1);
       let childWidth = panelWidth - arrowheadWidth - 2;
       let child = headers[i];
-      child.style.marginLeft = childLeft + "px";
-      child.style.marginRight = (width - childLeft - childWidth) + "px";
+      child.style.MozMarginStart = childLeft + "px";
+      child.style.MozMarginEnd = (width - childLeft - childWidth) + "px";
       child.style.width = childWidth + "px";
     }
 
     // Resize after initialization should be ignored
     canvas.parentNode.removeAttribute("flex");
   }
 
   function getActiveItem()