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

chrome/content/ui/sendReport.js

Index: chrome/content/ui/sendReport.js
===================================================================
--- a/chrome/content/ui/sendReport.js
+++ b/chrome/content/ui/sendReport.js
@@ -361,17 +361,24 @@ let screenshotDataSource =
     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";