Issue 2809 - Issue reporter: Handle canvas.drawWindow() failure gracefully

chrome/content/ui/sendReport.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 348 matching lines @@
     let copyHeight = Math.min(wndHeight, 30000, copyWidth * 5);
     let copyX = Math.max(Math.min(wnd.scrollX - copyWidth / 2, wndWidth - copyWidth), 0);
     let copyY = Math.max(Math.min(wnd.scrollY - copyHeight / 2, wndHeight - copyHeight), 0);
 
     let scalingFactor = (this._canvas.width - this.imageOffset * 2) / copyWidth;
     this._canvas.height = copyHeight * scalingFactor + this.imageOffset * 2;
 
     this._context.save();
     this._context.translate(this.imageOffset, this.imageOffset);
     this._context.scale(scalingFactor, scalingFactor);
-    this._context.drawWindow(wnd, copyX, copyY, copyWidth, copyHeight, "rgb(255,255,255)");
+    try
+    {
+      this._context.drawWindow(wnd, copyX, copyY, copyWidth, copyHeight, "rgb(255,255,255)");
+    }
+    catch (e)
+    {
+      Cu.reportError(e);
+    }
     this._context.restore();
 
     // Init canvas settings
     this._context.fillStyle = "rgb(0, 0, 0)";
     this._context.strokeStyle = "rgba(255, 0, 0, 0.7)";
     this._context.lineWidth = 3;
     this._context.lineJoin = "round";
 
     // Reduce colors asynchronously
     this._pixelData = this._context.getImageData(this.imageOffset, this.imageOffset,
@@ skipping 1197 matching lines @@
 
 function censorURL(url)
 {
   return url.replace(/([?;&\/#][^?;&\/#]+?=)[^?;&\/#]+/g, "$1*");
 }
 
 function encodeHTML(str)
 {
   return str.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
 }