diff --git a/extensions/firefox/content/PdfJs-stub.jsm b/extensions/firefox/content/PdfJs-stub.jsm
new file mode 100644
index 000000000..7e5f1d6a0
--- /dev/null
+++ b/extensions/firefox/content/PdfJs-stub.jsm
@@ -0,0 +1,7 @@
+// Don't remove this file. FF15+ expects PdfJs module to be present at resource://pdf.js/PdfJs.jsm
+// See https://mxr.mozilla.org/mozilla-central/source/browser/components/nsBrowserGlue.js
+var EXPORTED_SYMBOLS = ["PdfJs"];
+
+let PdfJs = {
+  init: function PdfJs_init() {}
+};
diff --git a/make.js b/make.js
index 1d2e5cfcf..a4483c7eb 100755
--- a/make.js
+++ b/make.js
@@ -339,6 +339,8 @@ target.firefox = function() {
   mkdir('-p', FIREFOX_BUILD_CONTENT_DIR + BUILD_DIR);
   mkdir('-p', FIREFOX_BUILD_CONTENT_DIR + '/web');
 
+  cp(FIREFOX_CONTENT_DIR + 'PdfJs-stub.jsm', FIREFOX_BUILD_CONTENT_DIR + 'PdfJs.jsm');
+
   // Copy extension files
   cd('extensions/firefox');
   cp('-R', FIREFOX_EXTENSION_FILES_TO_COPY, ROOT_DIR + FIREFOX_BUILD_DIR);
diff --git a/web/viewer.css b/web/viewer.css
index 70d659c3d..62ff3f2eb 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -1162,6 +1162,17 @@ canvas {
   font-size: 10px;
 }
 
+#viewer.textLayer-visible .textLayer > div,
+#viewer.textLayer-hover .textLayer > div:hover {
+  background-color: white;
+  color: black;
+}
+
+#viewer.textLayer-shadow .textLayer > div {
+  background-color: rgba(255,255,255, .6);
+  color: black;
+}
+
 @page {
   margin: 0;
 } 
diff --git a/web/viewer.js b/web/viewer.js
index 03766ab19..48bbf6eec 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -1802,8 +1802,19 @@ window.addEventListener('load', function webViewerLoad(evt) {
   mozL10n.language.code = locale;
 //#endif
 
-  if ('disableTextLayer' in hashParams)
-    PDFJS.disableTextLayer = (hashParams['disableTextLayer'] === 'true');
+  if ('textLayer' in hashParams) {
+    switch (hashParams['textLayer']) {
+      case 'off':
+        PDFJS.disableTextLayer = true;
+        break;
+      case 'visible':
+      case 'shadow':
+      case 'hover':
+        var viewer = document.getElementById('viewer');
+        viewer.classList.add('textLayer-' + hashParams['textLayer']);
+        break;
+    }
+  }
 
 //#if !(FIREFOX || MOZCENTRAL)
   if ('pdfBug' in hashParams) {