I installed Pale Moon.

builds/appchan-x.user.js

@@ -2750,15 +2750,21 @@
   };
 
   $.addClass = function() {
-    var className, el, _ref;
+    var className, classNames, el, _i, _len;
-    el = arguments[0], className = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+    el = arguments[0], classNames = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
-    return (_ref = el.classList).add.apply(_ref, className);
+    for (_i = 0, _len = classNames.length; _i < _len; _i++) {
+      className = classNames[_i];
+      el.classList.add(className);
+    }
   };
 
   $.rmClass = function() {
-    var className, el, _ref;
+    var className, classNames, el, _i, _len;
-    el = arguments[0], className = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+    el = arguments[0], classNames = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
-    return (_ref = el.classList).remove.apply(_ref, className);
+    for (_i = 0, _len = classNames.length; _i < _len; _i++) {
+      className = classNames[_i];
+      el.classList.remove(className);
+    }
   };
 
   $.toggleClass = function(el, className) {
@@ -7497,7 +7503,7 @@
       var a, frag, hash, text;
       $.addClass(quoted.nodes.post, 'quoted');
       frag = QuoteBacklink.frag.cloneNode(true);
-      a = frag.lastElementChild;
+      a = frag.querySelector("a:last-of-type");
       a.href = Build.path(quoter.board.ID, quoter.thread.ID, quoter.ID);
       a.textContent = text = Conf['backlink'].replace(/%id/g, quoter.ID);
       if (quoter.isDead) {
@@ -18160,7 +18166,7 @@
       }));
       $.event('4chanXInitFinished');
       test = $.el('span');
-      test.classList.add('a', 'b');
+      $.addClass(test, 'a', 'b');
       if (test.className !== 'a b' && Conf['Show Support Message']) {
         new Notice('warning', "Your version of Firefox is outdated (v26 minimum) and appchan x may not operate correctly.", 30);
       }

builds/crx/script.js

@@ -2721,15 +2721,21 @@
   };
 
   $.addClass = function() {
-    var className, el, _ref;
+    var className, classNames, el, _i, _len;
-    el = arguments[0], className = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+    el = arguments[0], classNames = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
-    return (_ref = el.classList).add.apply(_ref, className);
+    for (_i = 0, _len = classNames.length; _i < _len; _i++) {
+      className = classNames[_i];
+      el.classList.add(className);
+    }
   };
 
   $.rmClass = function() {
-    var className, el, _ref;
+    var className, classNames, el, _i, _len;
-    el = arguments[0], className = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
+    el = arguments[0], classNames = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
-    return (_ref = el.classList).remove.apply(_ref, className);
+    for (_i = 0, _len = classNames.length; _i < _len; _i++) {
+      className = classNames[_i];
+      el.classList.remove(className);
+    }
   };
 
   $.toggleClass = function(el, className) {
@@ -7518,7 +7524,7 @@
       var a, frag, hash, text;
       $.addClass(quoted.nodes.post, 'quoted');
       frag = QuoteBacklink.frag.cloneNode(true);
-      a = frag.lastElementChild;
+      a = frag.querySelector("a:last-of-type");
       a.href = Build.path(quoter.board.ID, quoter.thread.ID, quoter.ID);
       a.textContent = text = Conf['backlink'].replace(/%id/g, quoter.ID);
       if (quoter.isDead) {

src/General/Main.coffee

@@ -215,7 +215,7 @@ Main =
 
     <% if (type === 'userscript') { %>
     test = $.el 'span'
-    test.classList.add 'a', 'b'
+    $.addClass test, 'a', 'b'
     if test.className isnt 'a b' and Conf['Show Support Message']
       new Notice 'warning', "Your version of Firefox is outdated (v<%= meta.min.firefox %> minimum) and <%= meta.name %> may not operate correctly.", 30
 

src/General/lib/$.coffee

@@ -116,11 +116,13 @@ $.X = (path, root) ->
   # XPathResult.ORDERED_NODE_SNAPSHOT_TYPE === 7
   d.evaluate path, root, null, 7, null
 
-$.addClass = (el, className...) ->
+$.addClass = (el, classNames...) ->
-  el.classList.add className...
+  el.classList.add className for className in classNames
+  return
 
-$.rmClass = (el, className...) ->
+$.rmClass = (el, classNames...) ->
-  el.classList.remove className...
+  el.classList.remove className for className in classNames
+  return
 
 $.toggleClass = (el, className) ->
   el.classList.toggle className

src/Quotelinks/QuoteBacklink.coffee

@@ -53,7 +53,7 @@ QuoteBacklink =
   buildBacklink: (quoted, quoter) ->
     $.addClass quoted.nodes.post, 'quoted'
     frag = QuoteBacklink.frag.cloneNode true
-    a = frag.lastElementChild
+    a = frag.querySelector "a:last-of-type"
     a.href = Build.path quoter.board.ID, quoter.thread.ID, quoter.ID
     a.textContent = text = Conf['backlink'].replace /%id/g, quoter.ID
     if quoter.isDead