diff --git a/common/content/completion.js b/common/content/completion.js
index 1d8c35be..c4370555 100644
--- a/common/content/completion.js
+++ b/common/content/completion.js
@@ -54,7 +54,7 @@ const CompletionContext = Class("CompletionContext", {
 
             ["filters", "keys", "title", "quote"].forEach(function (key)
                 self[key] = parent[key] && util.cloneObject(parent[key]));
-            ["anchored", "compare", "editor", "_filter", "filterFunc", "keys", "process", "top"].forEach(function (key)
+            ["anchored", "compare", "editor", "_filter", "filterFunc", "forceAnchored", "keys", "process", "top"].forEach(function (key)
                 self[key] = parent[key]);
 
             self.__defineGetter__("value", function () this.top.value);
@@ -96,6 +96,7 @@ const CompletionContext = Class("CompletionContext", {
              * @default true
              */
             this.anchored = true;
+            this.forceAnchored = null;
 
             this.compare = function (a, b) String.localeCompare(a.text, b.text);
             /**
@@ -405,6 +406,9 @@ const CompletionContext = Class("CompletionContext", {
         let self = this;
         delete this._substrings;
 
+        if (!this.forceAnchored)
+            this.anchored = options.get("wildanchor").getKey(this.name, this.anchored);
+
         // Item matchers
         if (this.ignoreCase)
             this.matchString = this.anchored ?
@@ -802,7 +806,7 @@ const Completion = Module("completion", {
                     </div>);
             },
             {
-                argCount: "1",
+                argCount: "*",
                 completer: function (context, args) {
                     let PREFIX = "/ex/contexts";
                     context.fork("ex", 0, completion, "ex");
@@ -849,6 +853,10 @@ const Completion = Module("completion", {
                 completer: function (context) array(values(completion.urlCompleters))
             });
 
+        options.add(["wildanchor", "wia"],
+            "Regexp list defining which contexts require matches anchored to the begining of the result",
+            "regexlist", "!/ex/(back|buffer|ext|forward|help|undo),.*");
+
         options.add(["wildcase", "wic"],
             "Completion case matching mode",
             "regexmap", "smart",
diff --git a/common/content/javascript.js b/common/content/javascript.js
index e355310b..a60ecf6e 100644
--- a/common/content/javascript.js
+++ b/common/content/javascript.js
@@ -358,6 +358,7 @@ const JavaScript = Module("javascript", {
             offset: key.length
         };
 
+        context.forceAnchored = true;
         // TODO: Make this a generic completion helper function.
         for (let [, obj] in Iterator(objects))
             this.context.fork(obj[1], this._top.offset, this, this._fill,
@@ -605,10 +606,7 @@ const JavaScript = Module("javascript", {
             "Switch on/off jsdebugger",
             "boolean", false, {
                 setter: function (value) {
-                    if (value)
-                        services.get("debugger").on();
-                    else
-                        services.get("debugger").off();
+                    services.get("debugger")[value ? "on" : "off"]();
                 },
                 getter: function () services.get("debugger").isOn
             });
diff --git a/common/content/options.js b/common/content/options.js
index ac58225c..08976352 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -382,11 +382,11 @@ const Option = Class("Option", {
         stringlist: function (k) this.values.indexOf(k) >= 0,
         get charlist() this.stringlist,
 
-        regexlist: function (k) {
+        regexlist: function (k, default_) {
             for (let re in values(this.values))
                 if (re.test(k))
                     return re.result;
-            return null;
+            return arguments.length > 1 ? default_ : null;
         },
         get regexmap() this.regexlist
     },
diff --git a/common/locale/en-US/options.xml b/common/locale/en-US/options.xml
index 599967f1..63079ee7 100644
--- a/common/locale/en-US/options.xml
+++ b/common/locale/en-US/options.xml
@@ -1376,6 +1376,24 @@
     </description>
 </item>
 
+<item>
+    <tags>'wia' 'wildanchor'</tags>
+    <spec>'wildanchor' 'wia'</spec>
+    <type>regexlist</type>
+    <default>!/ex/(back|buffer|ext|forward|help|undo),.*</default>
+    <description>
+        <p>
+            Regular expression list defining which completion groups show only
+            matches anchored to the beginning of the result. The first
+            matching expression is the one that applies. If the match is
+            negated, then the current filter may match anywhere in the result.
+            If it is not negated, then the match may only occur at the
+            beginning of the result. If no items match, then a
+            context-dependent default value is used.
+        </p>
+    </description>
+</item>
+
 <item>
     <tags>'wic' 'wildcase'</tags>
     <spec>'wildcase' 'wic'</spec>
diff --git a/pentadactyl/NEWS b/pentadactyl/NEWS
index c927385b..c6913fc5 100644
--- a/pentadactyl/NEWS
+++ b/pentadactyl/NEWS
@@ -24,13 +24,14 @@
       I.e., 'fo\o''bar' ≡ fo\o'bar
     * IMPORTANT: 'cdpath' and 'runtimepath' no longer treat ‘,,’
       specially. Use ‘.’ instead.
-    * Replaced 'focuscontent' with 'strictfocus'.
-    * Added 'hintkeys' option.
     * Added 'altwildmode' and <A-Tab> commandline key binding.
-    * Added 'banghist' option.
-    * Added ‘transliterated’ option to 'hintmatching'.
     * Added 'autocomplete' option for specifying which completion
       groups should be auto-completed.
+    * Added 'banghist' option.
+    * Added 'hintkeys' option.
+    * Replaced 'focuscontent' with 'strictfocus'.
+    * Added 'wildanchor' option.
+    * Added ‘transliterated’ option to 'hintmatching'.
     * Added -javascript option to :abbrev and :map.
     * Added several new options to :map.
     * Removed the :source line at the end of files generated by
diff --git a/pentadactyl/TODO b/pentadactyl/TODO
index 8a413356..f4e56397 100644
--- a/pentadactyl/TODO
+++ b/pentadactyl/TODO
@@ -42,7 +42,6 @@ BUGS:
 
 FEATURES:
 9 Make 'loadplugins' a regexlist
-9 Add 'wildanchor' option
 9 Add quoting help tag
 9 JavaScript completer: show function parameter spec
 9 Fix the arbitrary distinction between 'hinttags' and