diff --git a/src/jbig2.js b/src/jbig2.js
index f0b736731..5a81bdf82 100644
--- a/src/jbig2.js
+++ b/src/jbig2.js
@@ -1,5 +1,6 @@
 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* globals error, shadow */
 /* Copyright 2012 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -123,7 +124,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
           return d;
         } else {
           this.chigh -= qeIcx;
-          if ((this.a & 0x8000) == 0) {
+          if ((this.a & 0x8000) === 0) {
             var d = this.exchangeMps(cx);
             this.renormD();
             return d;
@@ -134,14 +135,14 @@ var Jbig2Image = (function Jbig2ImageClosure() {
       },
       renormD: function ArithmeticDecoder_renormD() {
         do {
-          if (this.ct == 0)
+          if (this.ct === 0)
             this.byteIn();
 
           this.a <<= 1;
           this.chigh = ((this.chigh << 1) & 0xFFFF) | ((this.clow >> 15) & 1);
           this.clow = (this.clow << 1) & 0xFFFF;
           this.ct--;
-        } while ((this.a & 0x8000) == 0);
+        } while ((this.a & 0x8000) === 0);
       },
       exchangeMps: function ArithmeticDecoder_exchangeMps(cx) {
         var d;
@@ -261,7 +262,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
           break;
         default:
           v = v * 2 + bit;
-          if (--toRead == 0)
+          if (--toRead === 0)
             state = 0;
           continue;
       }
@@ -437,7 +438,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
                             offsetX, offsetY, prediction, at,
                             decodingContext) {
     var codingTemplate = RefinementTemplates[templateIndex].coding;
-    if (templateIndex == 0)
+    if (templateIndex === 0)
       codingTemplate = codingTemplate.concat([at[0]]);
     var codingTemplateLength = codingTemplate.length;
     var codingTemplateX = new Int32Array(codingTemplateLength);
@@ -447,7 +448,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
       codingTemplateY[k] = codingTemplate[k].y;
     }
     var referenceTemplate = RefinementTemplates[templateIndex].reference;
-    if (templateIndex == 0)
+    if (templateIndex === 0)
       referenceTemplate = referenceTemplate.concat([at[1]]);
     var referenceTemplateLength = referenceTemplate.length;
     var referenceTemplateX = new Int32Array(referenceTemplateLength);
@@ -530,7 +531,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
       var totalWidth = 0;
       while (true) {
         var deltaWidth = decodeInteger(contextCache, 'IADW', decoder); // 6.5.7
-        if (deltaWidth == null)
+        if (deltaWidth === null)
           break; // OOB
         currentWidth += deltaWidth;
         totalWidth += currentWidth;
@@ -657,7 +658,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
         i++;
 
         var deltaS = decodeInteger(contextCache, 'IADS', decoder); // 6.4.8
-        if (deltaS == null)
+        if (deltaS === null)
           break; // OOB
         currentS += deltaS + dsOffset;
       } while (true);
@@ -779,7 +780,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
         dictionary.refinementTemplate = (dictionaryFlags >> 12) & 1;
         position += 2;
         if (!dictionary.huffman) {
-          var atLength = dictionary.template == 0 ? 4 : 1;
+          var atLength = dictionary.template === 0 ? 4 : 1;
           var at = [];
           for (var i = 0; i < atLength; i++) {
             at.push({
@@ -865,7 +866,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
         genericRegion.template = (genericRegionSegmentFlags >> 1) & 3;
         genericRegion.prediction = !!(genericRegionSegmentFlags & 8);
         if (!genericRegion.mmr) {
-          var atLength = genericRegion.template == 0 ? 4 : 1;
+          var atLength = genericRegion.template === 0 ? 4 : 1;
           var at = [];
           for (var i = 0; i < atLength; i++) {
             at.push({