--- a/browser/extensions/pdfjs/content/web/viewer.js
+++ b/browser/extensions/pdfjs/content/web/viewer.js
@@ -90,17 +90,17 @@
 /***/ (function(module, exports, __webpack_require__) {
 
 "use strict";
 
 
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
-exports.waitOnEventOrTimeout = exports.WaitOnType = exports.animationStarted = exports.normalizeWheelEventDelta = exports.binarySearchFirstItem = exports.watchScroll = exports.scrollIntoView = exports.getOutputScale = exports.approximateFraction = exports.getPageSizeInches = exports.roundToDivide = exports.getVisibleElements = exports.parseQueryString = exports.noContextMenuHandler = exports.getPDFFileNameFromURL = exports.ProgressBar = exports.EventBus = exports.NullL10n = exports.TextLayerMode = exports.RendererType = exports.PresentationModeState = exports.cloneObj = exports.isFileSchema = exports.isPortraitOrientation = exports.isValidRotation = exports.VERTICAL_PADDING = exports.SCROLLBAR_PADDING = exports.MAX_AUTO_SCALE = exports.UNKNOWN_SCALE = exports.MAX_SCALE = exports.MIN_SCALE = exports.DEFAULT_SCALE = exports.DEFAULT_SCALE_VALUE = exports.CSS_UNITS = undefined;
+exports.waitOnEventOrTimeout = exports.WaitOnType = exports.animationStarted = exports.normalizeWheelEventDelta = exports.binarySearchFirstItem = exports.watchScroll = exports.scrollIntoView = exports.getOutputScale = exports.approximateFraction = exports.getPageSizeInches = exports.roundToDivide = exports.getVisibleElements = exports.parseQueryString = exports.noContextMenuHandler = exports.getPDFFileNameFromURL = exports.ProgressBar = exports.EventBus = exports.NullL10n = exports.TextLayerMode = exports.RendererType = exports.PresentationModeState = exports.cloneObj = exports.isPortraitOrientation = exports.isValidRotation = exports.VERTICAL_PADDING = exports.SCROLLBAR_PADDING = exports.MAX_AUTO_SCALE = exports.UNKNOWN_SCALE = exports.MAX_SCALE = exports.MIN_SCALE = exports.DEFAULT_SCALE = exports.DEFAULT_SCALE_VALUE = exports.CSS_UNITS = undefined;
 
 var _pdfjsLib = __webpack_require__(1);
 
 const CSS_UNITS = 96.0 / 72.0;
 const DEFAULT_SCALE_VALUE = 'auto';
 const DEFAULT_SCALE = 1.0;
 const MIN_SCALE = 0.10;
 const MAX_SCALE = 10.0;
@@ -348,24 +348,16 @@ function getVisibleElements(scrollEl, vi
     first,
     last,
     views: visible
   };
 }
 function noContextMenuHandler(evt) {
   evt.preventDefault();
 }
-function isFileSchema(url) {
-  let i = 0,
-      ii = url.length;
-  while (i < ii && url[i].trim() === '') {
-    i++;
-  }
-  return url.substr(i, 7).toLowerCase() === 'file://';
-}
 function isDataSchema(url) {
   let i = 0,
       ii = url.length;
   while (i < ii && url[i].trim() === '') {
     i++;
   }
   return url.substr(i, 5).toLowerCase() === 'data:';
 }
@@ -549,17 +541,16 @@ exports.DEFAULT_SCALE = DEFAULT_SCALE;
 exports.MIN_SCALE = MIN_SCALE;
 exports.MAX_SCALE = MAX_SCALE;
 exports.UNKNOWN_SCALE = UNKNOWN_SCALE;
 exports.MAX_AUTO_SCALE = MAX_AUTO_SCALE;
 exports.SCROLLBAR_PADDING = SCROLLBAR_PADDING;
 exports.VERTICAL_PADDING = VERTICAL_PADDING;
 exports.isValidRotation = isValidRotation;
 exports.isPortraitOrientation = isPortraitOrientation;
-exports.isFileSchema = isFileSchema;
 exports.cloneObj = cloneObj;
 exports.PresentationModeState = PresentationModeState;
 exports.RendererType = RendererType;
 exports.TextLayerMode = TextLayerMode;
 exports.NullL10n = NullL10n;
 exports.EventBus = EventBus;
 exports.ProgressBar = ProgressBar;
 exports.getPDFFileNameFromURL = getPDFFileNameFromURL;
@@ -1367,21 +1358,16 @@ let PDFViewerApplication = {
     if (args) {
       for (let prop in args) {
         if (prop === 'length') {
           this.pdfDocumentProperties.setFileSize(args[prop]);
         }
         parameters[prop] = args[prop];
       }
     }
-    if (this.url && (0, _ui_utils.isFileSchema)(this.url)) {
-      let appConfig = this.appConfig;
-      appConfig.toolbar.download.setAttribute('hidden', 'true');
-      appConfig.secondaryToolbar.downloadButton.setAttribute('hidden', 'true');
-    }
     let loadingTask = (0, _pdfjsLib.getDocument)(parameters);
     this.pdfLoadingTask = loadingTask;
     loadingTask.onPassword = (updateCallback, reason) => {
       this.passwordPrompt.setUpdateCallback(updateCallback, reason);
       this.passwordPrompt.open();
     };
     loadingTask.onProgress = ({ loaded, total }) => {
       this.progress(loaded / total);