diff --git a/extensions/accessibility-menu.js b/extensions/accessibility-menu.js
index 745bd1f38..1ff34d48d 100644
--- a/extensions/accessibility-menu.js
+++ b/extensions/accessibility-menu.js
@@ -40,7 +40,7 @@
   var PATH = MathJax.Ajax.config.path;
   if (!PATH.a11y) PATH.a11y =
       (PATH.Contrib ? PATH.Contrib + "/a11y" : 
-      (String(location.protocal).match(/^https?:/) ? "" : "http:") + 
+      (String(location.protocol).match(/^https?:/) ? "" : "http:") + 
         "//cdn.mathjax.org/mathjax/contrib/a11y");
 
   var Accessibility = EXTENSIONS["accessibility-menu"] = {
diff --git a/extensions/auto-collapse.js b/extensions/auto-collapse.js
index 3c3b9f415..63c5d7f07 100644
--- a/extensions/auto-collapse.js
+++ b/extensions/auto-collapse.js
@@ -32,7 +32,7 @@
   var PATH = MathJax.Ajax.config.path;
   if (!PATH.a11y) PATH.a11y =
       (PATH.Contrib ? PATH.Contrib + "/a11y" : 
-      (String(location.protocal).match(/^https?:/) ? "" : "http:") + 
+      (String(location.protocol).match(/^https?:/) ? "" : "http:") + 
         "//cdn.mathjax.org/mathjax/contrib/a11y");
 
   var Collapse = MathJax.Extension["auto-collapse"] = {
diff --git a/extensions/collapsible.js b/extensions/collapsible.js
index f7de448db..ce5ba10ec 100644
--- a/extensions/collapsible.js
+++ b/extensions/collapsible.js
@@ -40,7 +40,7 @@
   var PATH = MathJax.Ajax.config.path;
   if (!PATH.a11y) PATH.a11y =
       (PATH.Contrib ? PATH.Contrib + "/a11y" : 
-      (String(location.protocal).match(/^https?:/) ? "" : "http:") + 
+      (String(location.protocol).match(/^https?:/) ? "" : "http:") + 
         "//cdn.mathjax.org/mathjax/contrib/a11y");
 
   var Collapsible = MathJax.Extension.collapsible = {
diff --git a/extensions/explorer.js b/extensions/explorer.js
index 3b14cd3e5..c3c0e3ed7 100644
--- a/extensions/explorer.js
+++ b/extensions/explorer.js
@@ -787,7 +787,7 @@ MathJax.Hub.Register.StartupHook("SVG Jax Ready",function () {
 //
 if (!MathJax.Ajax.config.path.a11y) {
   MathJax.Ajax.config.path.a11y =
-      (String(location.protocal).match(/^https?:/) ? '' : 'http:') +
+      (String(location.protocol).match(/^https?:/) ? '' : 'http:') +
       '//cdn.mathjax.org/mathjax/contrib/a11y';
 }
 
diff --git a/extensions/semantic-enrich.js b/extensions/semantic-enrich.js
index defcfec70..e078a1264 100644
--- a/extensions/semantic-enrich.js
+++ b/extensions/semantic-enrich.js
@@ -95,7 +95,7 @@ MathJax.Extension["semantic-enrich"] = {
   var PATH = MathJax.Ajax.config.path;
   if (!PATH.a11y) PATH.a11y =
       (PATH.Contrib ? PATH.Contrib + "/a11y" : 
-      (String(location.protocal).match(/^https?:/) ? "" : "http:") + 
+      (String(location.protocol).match(/^https?:/) ? "" : "http:") + 
         "//cdn.mathjax.org/mathjax/contrib/a11y");
 
   //