diff --git a/make.js b/make.js
index 83aff5b14fd340..4073da4a5ecc22 100644
--- a/make.js
+++ b/make.js
@@ -70,7 +70,6 @@ var DEFINES = {
   GENERIC: false,
   FIREFOX: false,
   MOZCENTRAL: false,
-  B2G: false,
   CHROME: false,
   MINIFIED: false,
   SINGLE_FILE: false,
@@ -985,8 +984,7 @@ target.b2g = function() {
   echo();
   echo('### Building B2G (Firefox OS App)');
   var B2G_BUILD_CONTENT_DIR = B2G_BUILD_DIR + '/content/';
-  var defines = builder.merge(DEFINES, { B2G: true });
-  target.bundle({ defines: defines });
+  target.bundle();
 
   // Clear out everything in the b2g build directory
   cd(ROOT_DIR);
@@ -999,7 +997,7 @@ target.b2g = function() {
   mkdir('-p', B2G_BUILD_CONTENT_DIR + '/pdfjs-components/cmaps');
 
   var setup = {
-    defines: defines,
+    defines: DEFINES,
     copy: [
       ['extensions/b2g/images', B2G_BUILD_CONTENT_DIR + '/web'],
       ['extensions/b2g/viewer.html', B2G_BUILD_CONTENT_DIR + '/web'],
diff --git a/src/core/chunked_stream.js b/src/core/chunked_stream.js
index 427673c4ea7e5c..5b6b2ddfec1f07 100644
--- a/src/core/chunked_stream.js
+++ b/src/core/chunked_stream.js
@@ -287,11 +287,7 @@ var ChunkedStreamManager = (function ChunkedStreamManagerClosure() {
     } else {
 
       var getXhr = function getXhr() {
-//#if B2G
-//      return new XMLHttpRequest({ mozSystem: true });
-//#else
         return new XMLHttpRequest();
-//#endif
       };
       this.networkManager = new NetworkManager(this.url, {
         getXhr: getXhr,
diff --git a/src/core/murmurhash3.js b/src/core/murmurhash3.js
index cdc3500f0f7bd7..deaba73a700a69 100644
--- a/src/core/murmurhash3.js
+++ b/src/core/murmurhash3.js
@@ -35,7 +35,7 @@ var MurmurHash3_64 = (function MurmurHash3_64Closure (seed) {
   }
 
   var alwaysUseUint32ArrayView = false;
-//#if !(FIREFOX || MOZCENTRAL || B2G || CHROME)
+//#if !(FIREFOX || MOZCENTRAL || CHROME)
   // old webkits have issues with non-aligned arrays
   try {
     new Uint32Array(new Uint8Array(5).buffer, 0, 1);
diff --git a/src/core/network.js b/src/core/network.js
index c030f71a1ca697..2ae407424e7927 100644
--- a/src/core/network.js
+++ b/src/core/network.js
@@ -50,11 +50,7 @@ var NetworkManager = (function NetworkManagerClosure() {
     this.withCredentials = args.withCredentials || false;
     this.getXhr = args.getXhr ||
       function NetworkManager_getXhr() {
-//#if B2G
-//      return new XMLHttpRequest({ mozSystem: true });
-//#else
         return new XMLHttpRequest();
-//#endif
       };
 
     this.currXhrId = 0;
diff --git a/src/shared/util.js b/src/shared/util.js
index 382f6437fc28c5..ee38bea39580cf 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -503,8 +503,8 @@ Object.defineProperty(PDFJS, 'isLittleEndian', {
   }
 });
 
-//#if !(FIREFOX || MOZCENTRAL || B2G || CHROME)
-//// Lazy test if the userAgant support CanvasTypedArrays
+//#if !(FIREFOX || MOZCENTRAL || CHROME)
+//// Lazy test if the userAgent support CanvasTypedArrays
 function hasCanvasTypedArrays() {
   var canvas = document.createElement('canvas');
   canvas.width = canvas.height = 1;
diff --git a/web/default_preferences.js b/web/default_preferences.js
index 57fe8b9ddbe471..10474144a7dec5 100644
--- a/web/default_preferences.js
+++ b/web/default_preferences.js
@@ -31,11 +31,6 @@ var DEFAULT_PREFERENCES = {
   disableStream: false,
   disableAutoFetch: false,
   disableFontFace: false,
-//#if B2G
-//disableTextLayer: true,
-//useOnlyCssZoom: true
-//#else
   disableTextLayer: false,
   useOnlyCssZoom: false
-//#endif
 };
diff --git a/web/preferences.js b/web/preferences.js
index 88feabce2c79c8..967101d7f7e793 100644
--- a/web/preferences.js
+++ b/web/preferences.js
@@ -160,24 +160,6 @@ var Preferences = {
   }
 };
 
-//#if B2G
-//Preferences._writeToStorage = function (prefObj) {
-//  return new Promise(function (resolve) {
-//    asyncStorage.setItem('pdfjs.preferences', JSON.stringify(prefObj),
-//                         resolve);
-//  });
-//};
-//
-//Preferences._readFromStorage = function (prefObj) {
-//  return new Promise(function (resolve) {
-//    asyncStorage.getItem('pdfjs.preferences', function (prefStr) {
-//      var readPrefs = JSON.parse(prefStr);
-//      resolve(readPrefs);
-//    });
-//  });
-//};
-//#endif
-
 //#if CHROME
 //Preferences._writeToStorage = function (prefObj) {
 //  return new Promise(function (resolve) {
@@ -221,7 +203,7 @@ var Preferences = {
 //};
 //#endif
 
-//#if !(FIREFOX || MOZCENTRAL || B2G || CHROME)
+//#if !(FIREFOX || MOZCENTRAL || CHROME)
 Preferences._writeToStorage = function (prefObj) {
   return new Promise(function (resolve) {
     localStorage.setItem('pdfjs.preferences', JSON.stringify(prefObj));
diff --git a/web/view_history.js b/web/view_history.js
index 6f2cce48c1deb2..cb21153b66a6f6 100644
--- a/web/view_history.js
+++ b/web/view_history.js
@@ -25,7 +25,6 @@
  * The way that the view parameters are stored depends on how PDF.js is built,
  * for 'node make <flag>' the following cases exist:
  *  - FIREFOX or MOZCENTRAL - uses sessionStorage.
- *  - B2G                   - uses asyncStorage.
  *  - GENERIC or CHROME     - uses localStorage, if it is available.
  */
 var ViewHistory = (function ViewHistoryClosure() {
@@ -64,16 +63,12 @@ var ViewHistory = (function ViewHistoryClosure() {
       return new Promise(function (resolve) {
         var databaseStr = JSON.stringify(this.database);
 
-//#if B2G
-//      asyncStorage.setItem('database', databaseStr, resolve);
-//#endif
-
 //#if FIREFOX || MOZCENTRAL
 //      sessionStorage.setItem('pdfjsHistory', databaseStr);
 //      resolve();
 //#endif
 
-//#if !(FIREFOX || MOZCENTRAL || B2G)
+//#if !(FIREFOX || MOZCENTRAL)
         localStorage.setItem('database', databaseStr);
         resolve();
 //#endif
@@ -82,15 +77,11 @@ var ViewHistory = (function ViewHistoryClosure() {
 
     _readFromStorage: function ViewHistory_readFromStorage() {
       return new Promise(function (resolve) {
-//#if B2G
-//      asyncStorage.getItem('database', resolve);
-//#endif
-
 //#if FIREFOX || MOZCENTRAL
 //      resolve(sessionStorage.getItem('pdfjsHistory'));
 //#endif
 
-//#if !(FIREFOX || MOZCENTRAL || B2G)
+//#if !(FIREFOX || MOZCENTRAL)
         resolve(localStorage.getItem('database'));
 //#endif
       });
diff --git a/web/viewer.js b/web/viewer.js
index fff17f46e91447..1588ad6059871f 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -36,13 +36,9 @@ var SCALE_SELECT_CONTAINER_PADDING = 8;
 var SCALE_SELECT_PADDING = 22;
 var PAGE_NUMBER_LOADING_INDICATOR = 'visiblePageIsLoading';
 var DISABLE_AUTO_FETCH_LOADING_BAR_TIMEOUT = 5000;
-//#if B2G
-//PDFJS.useOnlyCssZoom = true;
-//PDFJS.disableTextLayer = true;
-//#endif
 
 PDFJS.imageResourcesPath = './images/';
-//#if (FIREFOX || MOZCENTRAL || B2G || GENERIC || CHROME)
+//#if (FIREFOX || MOZCENTRAL || GENERIC || CHROME)
 //PDFJS.workerSrc = '../build/pdf.worker.js';
 //#endif
 //#if !PRODUCTION
@@ -58,18 +54,13 @@ var mozL10n = document.mozL10n || document.webL10n;
 //#include ui_utils.js
 //#include preferences.js
 
-//#if !(FIREFOX || MOZCENTRAL || B2G)
+//#if !(FIREFOX || MOZCENTRAL)
 //#include mozPrintCallback_polyfill.js
 //#endif
 
 //#if GENERIC || CHROME
 //#include download_manager.js
 //#endif
-//#if B2G
-//var DownloadManager = (function DownloadManagerClosure() {
-//  return function DownloadManager() {};
-//})();
-//#endif
 
 //#if FIREFOX || MOZCENTRAL
 //#include firefoxcom.js
@@ -475,9 +466,6 @@ var PDFViewerApplication = {
       return;
     }
     document.title = title;
-//#if B2G
-//  document.getElementById('activityTitle').textContent = title;
-//#endif
   },
 
   close: function pdfViewClose() {
@@ -560,10 +548,6 @@ var PDFViewerApplication = {
           loadingErrorMessage = mozL10n.get('unexpected_response_error', null,
                                             'Unexpected server response.');
         }
-//#if B2G
-//      window.alert(loadingErrorMessage);
-//      return window.close();
-//#endif
 
         var moreInfo = {
           message: message
@@ -757,7 +741,7 @@ var PDFViewerApplication = {
     var id = this.documentFingerprint = pdfDocument.fingerprint;
     var store = this.store = new ViewHistory(id);
 
-//#if (GENERIC || B2G)
+//#if GENERIC
     var baseDocumentUrl = null;
 //#endif
 //#if (FIREFOX || MOZCENTRAL)
@@ -1253,7 +1237,7 @@ function webViewerLoad(evt) {
 }
 
 function webViewerInitialized() {
-//#if (GENERIC || B2G)
+//#if GENERIC
   var queryString = document.location.search.substring(1);
   var params = parseQueryString(queryString);
   var file = 'file' in params ? params.file : DEFAULT_URL;
@@ -2106,24 +2090,3 @@ window.addEventListener('afterprint', function afterPrint(evt) {
     window.requestAnimationFrame(resolve);
   });
 })();
-
-//#if B2G
-//window.navigator.mozSetMessageHandler('activity', function(activity) {
-//  var blob = activity.source.data.blob;
-//  PDFJS.maxImageSize = 1024 * 1024;
-//  var fileURL = activity.source.data.url ||
-//    activity.source.data.filename ||
-//    " "; // if no url or filename, use a non-empty string
-//
-//  var url = URL.createObjectURL(blob);
-//  // We need to delay opening until all HTML is loaded.
-//  PDFViewerApplication.animationStartedPromise.then(function () {
-//    PDFViewerApplication.open({url : url, originalUrl: fileURL});
-//
-//    var header = document.getElementById('header');
-//    header.addEventListener('action', function() {
-//      activity.postResult('close');
-//    });
-//  });
-//});
-//#endif