diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 53bdaef1..d1640dcd 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1417,7 +1417,7 @@ const Dactyl = Module("dactyl", {
                     });
                 },
                 getInstallForURL: function (url, callback, mimetype) {
-                    dactyl.assert(false, "Install by URL not implimented");
+                    dactyl.assert(false, "Install by URL not implemented");
                 },
             };
 
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index 404872cf..8e3c859e 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -819,7 +819,7 @@ memoize(Class.prototype, "closure", function () {
 });
 
 /**
- * A base class generator for classes which impliment XPCOM interfaces.
+ * A base class generator for classes which implement XPCOM interfaces.
  *
  * @param {nsIIID|[nsIJSIID]} interfaces The interfaces which the class
  *      implements.