diff --git a/unpacked/extensions/MatchWebFonts.js b/unpacked/extensions/MatchWebFonts.js
index 5872faa53..c6546ce3c 100644
--- a/unpacked/extensions/MatchWebFonts.js
+++ b/unpacked/extensions/MatchWebFonts.js
@@ -40,7 +40,7 @@
     fontCheckTimeout: 15 * 1000,  // how long to keep looking for fonts (15 seconds)
   });
   
-  var MATCH = MathJax.Extension.MatchWebFonts = {
+  MathJax.Extension.MatchWebFonts = {
     version: VERSION,
     config: CONFIG
   };
@@ -81,7 +81,6 @@
         for (i = 0, m = scripts.length; i < m; i++) {
           script = scripts[i]; if (!script.parentNode) continue; retry = true;
           var jax = script.MathJax.elementJax; if (!jax) continue;
-          var span = document.getElementById(jax.inputID+"-Frame");
           //
           //  Check if ex or mex has changed
           //
@@ -153,13 +152,12 @@
         for (i = 0, m = scripts.length; i < m; i++) {
           script = scripts[i]; if (!script.parentNode) continue; retry = true;
           var jax = script.MathJax.elementJax; if (!jax) continue;
-          var span = document.getElementById(jax.inputID+"-Frame");
           //
           //  Check if ex or mex has changed
           //
           var test = script.previousSibling;
           var ex = test.firstChild.offsetHeight/60;
-          if (ex === 0 || ex === "NaN") {ex = this.defaultEx; em = this.defaultEm}
+          if (ex === 0 || ex === "NaN") {ex = this.defaultEx}
           if (ex !== jax.SVG.ex) {size.push(script); scripts[i] = {}}
         }
         //
@@ -259,7 +257,7 @@
           //  Check widths of mtd elements
           //
           if (math.MathJaxMtds) {
-            for (j = 0, n = math.MathJaxMtds.length; j < n; j++) {
+            for (var j = 0, n = math.MathJaxMtds.length; j < n; j++) {
               if (!math.MathJaxMtds[j].parentNode) continue;
               if (newEx || math.MathJaxMtds[j].firstChild.scrollWidth !== jax.mtds[j]) {
                 jax.mtds[j] = math.MathJaxMtds[j].firstChild.scrollWidth;
diff --git a/unpacked/extensions/MathZoom.js b/unpacked/extensions/MathZoom.js
index ac1555536..42bb6c43f 100644
--- a/unpacked/extensions/MathZoom.js
+++ b/unpacked/extensions/MathZoom.js
@@ -258,7 +258,7 @@
       overlay.style.display = "";
     },
     findContainer: function (obj) {
-      var obj = obj.parentNode;
+      obj = obj.parentNode;
       while (obj.parentNode && obj !== document.body && ZOOM.getOverflow(obj) === "visible")
         {obj = obj.parentNode}
       return obj;
diff --git a/unpacked/jax/input/TeX/jax.js b/unpacked/jax/input/TeX/jax.js
index ddbce1cf3..a6a660c41 100644
--- a/unpacked/jax/input/TeX/jax.js
+++ b/unpacked/jax/input/TeX/jax.js
@@ -1721,7 +1721,7 @@
       if (!cmd) {TEX.Error(["UnknownEnv","Unknown environment '%1'",env])}
       if (!(cmd instanceof Array)) {cmd = [cmd]}
       var end = (cmd[1] instanceof Array ? cmd[1][0] : cmd[1]);
-      mml = STACKITEM.begin().With({name: env, end: end, parse:this});
+      var mml = STACKITEM.begin().With({name: env, end: end, parse:this});
       if (name === "\\end") {
         if (!isEnd && cmd[1] instanceof Array && this[cmd[1][1]]) {
           mml = this[cmd[1][1]].apply(this,[mml].concat(cmd.slice(2)));
diff --git a/unpacked/jax/output/HTML-CSS/autoload/mglyph.js b/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
index a4ae0bb7d..c93f0acd4 100644
--- a/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
+++ b/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
@@ -68,7 +68,7 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
           this.Append(err); err.toHTML(span); this.data.pop();
           span.bbox = err.HTMLspanElement().bbox;
         } else {
-          var mu = this.HTMLgetMu(span), size;
+          var mu = this.HTMLgetMu(span);
           img = HTMLCSS.addElement(span,"img",{isMathJax:true, src:values.src, alt:values.alt, title:values.alt});
           if (values.width)  {
             img.style.width = HTMLCSS.Em(HTMLCSS.length2em(values.width,mu,this.img.img.width/HTMLCSS.em));
diff --git a/unpacked/jax/output/HTML-CSS/autoload/multiline.js b/unpacked/jax/output/HTML-CSS/autoload/multiline.js
index a81a86dc5..2e83e9d67 100644
--- a/unpacked/jax/output/HTML-CSS/autoload/multiline.js
+++ b/unpacked/jax/output/HTML-CSS/autoload/multiline.js
@@ -570,8 +570,8 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
     },
     
     HTMLmoveLine: function (start,end,span,state,values) {
-      var SPAN = this.HTMLspanElement(), data = SPAN.bbox, base = data,
-          stack = SPAN.firstChild,dx, BOX = {};
+      var SPAN = this.HTMLspanElement(), data = SPAN.bbox,
+          stack = SPAN.firstChild, BOX = {};
       if (HTMLCSS.msiePaddingWidthBug) {stack = stack.nextSibling}
       var box = stack.firstChild;