diff --git a/unpacked/extensions/asciimath2jax.js b/unpacked/extensions/asciimath2jax.js
index 124dd9208..0a4754cdd 100644
--- a/unpacked/extensions/asciimath2jax.js
+++ b/unpacked/extensions/asciimath2jax.js
@@ -201,9 +201,8 @@ MathJax.Extension.asciimath2jax = {
   },
   
   createPreview: function (mode,asciimath) {
-    var preview;
-    if (this.config.preview === "AsciiMath") {preview = [this.filterPreview(asciimath)]}
-    else if (this.config.preview instanceof Array) {preview = this.config.preview}
+    var preview = this.config.preview;
+    if (preview === "AsciiMath") {preview = [this.filterPreview(asciimath)]}
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
       this.insertNode(preview);
diff --git a/unpacked/extensions/jsMath2jax.js b/unpacked/extensions/jsMath2jax.js
index cdc06a514..ed479839b 100644
--- a/unpacked/extensions/jsMath2jax.js
+++ b/unpacked/extensions/jsMath2jax.js
@@ -70,9 +70,8 @@ MathJax.Extension.jsMath2jax = {
   },
   
   createPreview: function (node) {
-    var preview;
-    if (this.config.preview === "TeX") {preview = [this.filterPreview(node.innerHTML)]}
-    else if (this.config.preview instanceof Array) {preview = this.config.preview}
+    var preview = this.config.preview;
+    if (preview === "TeX") {preview = [this.filterPreview(node.innerHTML)]}
     if (preview) {
       preview = MathJax.HTML.Element("span",{className: MathJax.Hub.config.preRemoveClass},preview);
       node.parentNode.insertBefore(preview,node);
diff --git a/unpacked/extensions/mml2jax.js b/unpacked/extensions/mml2jax.js
index 258e2146d..d5446caa2 100644
--- a/unpacked/extensions/mml2jax.js
+++ b/unpacked/extensions/mml2jax.js
@@ -172,15 +172,15 @@ MathJax.Extension.mml2jax = {
   },
   quoteHTML: function (string) {
     if (string == null) {string = ""}
-    return string.replace(/&/g,"&#x26;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;");
+    return string.replace(/&/g,"&#x26;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/\"/g,"&quot;");
   },
   
   createPreview: function (math,script) {
-    var preview;
-    if (this.config.preview === "alttext") {
+    var preview = this.config.preview;
+    if (preview === "alttext") {
       var text = math.getAttribute("alttext");
       if (text != null) {preview = [this.filterPreview(text)]}
-    } else if (this.config.preview instanceof Array) {preview = this.config.preview}
+    }
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
       script.parentNode.insertBefore(preview,script);
diff --git a/unpacked/extensions/tex2jax.js b/unpacked/extensions/tex2jax.js
index 722db7e7d..52d33a9c2 100644
--- a/unpacked/extensions/tex2jax.js
+++ b/unpacked/extensions/tex2jax.js
@@ -271,9 +271,8 @@ MathJax.Extension.tex2jax = {
   },
   
   createPreview: function (mode,tex) {
-    var preview;
-    if (this.config.preview === "TeX") {preview = [this.filterPreview(tex)]}
-    else if (this.config.preview instanceof Array) {preview = this.config.preview}
+    var preview = this.config.preview;
+    if (preview === "TeX") {preview = [this.filterPreview(tex)]}
     if (preview) {
       preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
       this.insertNode(preview);