Enable/disable search via about:config pref

extensions/firefox/components/PdfStreamConverter.js

@@ -161,6 +161,9 @@ ChromeActions.prototype = {
   },
   pdfBugEnabled: function() {
     return getBoolPref(EXT_PREFIX + '.pdfBugEnabled', false);
+  },
+  searchEnabled: function() {
+    return getBoolPref(EXT_PREFIX + '.searchEnabled', false);
   }
 };
 

web/viewer.html

@@ -51,7 +51,7 @@
           <button id="viewOutline" class="toolbarButton group" title="Show Document Outline" onclick="PDFView.switchSidebarView('outline')" tabindex="2" data-l10n-id="outline">
              <span data-l10n-id="outline_label">Document Outline</span>
           </button>
-          <button id="viewSearch" class="toolbarButton group" title="Search Document" onclick="PDFView.switchSidebarView('search')" tabindex="3" data-l10n-id="search">
+          <button id="viewSearch" class="toolbarButton group hidden" title="Search Document" onclick="PDFView.switchSidebarView('search')" tabindex="3" data-l10n-id="search">
              <span data-l10n-id="search_label">Search Document</span>
           </button>
         </div>

web/viewer.js

@@ -1490,6 +1490,11 @@ window.addEventListener('load', function webViewerLoad(evt) {
     PDFBug.init();
   }
 
+  if (!PDFJS.isFirefoxExtension ||
+    (PDFJS.isFirefoxExtension && FirefoxCom.request('searchEnabled'))) {
+    document.querySelector('#viewSearch').classList.remove('hidden');
+  }
+
   var thumbsView = document.getElementById('thumbnailView');
   thumbsView.addEventListener('scroll', updateThumbViewArea, true);