Merge pull request #4328 from Snuffleupagus/b2g-remove-pageNumber-spinner

[B2G] Remove the spinner from the pageNumber field

extensions/b2g/viewer.css

@@ -90,6 +90,7 @@ footer {
 }
 
 #pageNumber {
+  -moz-appearance: textfield; /* hides the spinner in moz */
   position: absolute;
   width: 28%;
   height: 100%;