Disable range request loading for safari.

web/compatibility.js

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals VBArray */
+/* globals VBArray, PDFJS */
 
 'use strict';
 
@@ -438,3 +438,20 @@
     enumerable: true
   });
 })();
+
+(function checkRangeRequests() {
+  // Safari has issues with cached range requests see:
+  // https://github.com/mozilla/pdf.js/issues/3260
+  // Last tested with version 6.0.4.
+  var isSafari = Object.prototype.toString.call(
+                  window.HTMLElement).indexOf('Constructor') > 0;
+  if (!isSafari) {
+    return;
+  }
+  document.addEventListener('DOMContentLoaded', function (e) {
+    if (isSafari) {
+      console.warn('Range requests are disabled for safari.');
+      PDFJS.disableRange = true;
+    }
+  });
+})();