Import (and augment) my cookies plugin per Doug's suggestion, and improve dactyl.generateHelp (and :yank).

common/locale/en-US/index.xml

@@ -226,6 +226,7 @@ This file contains a list of all available commands, mappings and options.
     <dt><ex>:comclear</ex></dt> <dd>Delete all user-defined commands</dd>
     <dt><ex>:command</ex></dt> <dd>List and define commands</dd>
     <dt><ex>:contexts</ex></dt> <dd>List the completion contexts used during completion of an Ex command</dd>
+    <dt><ex>:cookies</ex></dt> <dd>Change cookie permissions for sites</dd>
     <dt><ex>:cunabbrev</ex></dt> <dd>Remove an abbreviation in Command-line mode</dd>
     <dt><ex>:cunmap</ex></dt> <dd>Remove a mapping in Command-line mode</dd>
     <dt><ex>:delbmarks</ex></dt> <dd>Delete a bookmark</dd>
@@ -364,6 +365,9 @@ This file contains a list of all available commands, mappings and options.
     <dt><o>banghist</o></dt> <dd>Replace occurrences of ! with the previous command when executing external commands</dd>
     <dt><o>cdpath</o></dt> <dd>List of directories searched when executing <ex>:cd</ex></dd>
     <dt><o>complete</o></dt> <dd>Items which are completed at the <ex>:open</ex> prompts</dd>
+    <dt><o>cookieaccept</o></dt> <dd>When to accept cookies</dd>
+    <dt><o>cookielifetime</o></dt> <dd>The lifetime for which to accept cookies</dd>
+    <dt><o>cookies</o></dt> <dd>The default mode for newly added cookie permissions</dd>
     <dt><o>defsearch</o></dt> <dd>Set the default search engine</dd>
     <dt><o>editor</o></dt> <dd>Set the external text editor</dd>
     <dt><o>encoding</o></dt> <dd>Changes the character encoding of the current buffer</dd>

common/locale/en-US/options.xml

@@ -422,6 +422,52 @@
     </description>
 </item>
 
+<item>
+    <tags>'cookieaccept' 'ca'</tags>
+    <spec>'cookieaccept'</spec>
+    <type>string</type>
+    <default>all</default>
+    <description>
+        <p>When to accept cookies.</p>
+
+        <dl>
+            <dt>all</dt>      <dd>Accept all cookies</dd>
+            <dt>none</dt>     <dd>Accept no cookies</dd>
+            <dt>samesite</dt> <dd>Accept all non-third-party cookies</dd>
+        </dl>
+    </description>
+</item>
+
+<item>
+    <tags>'cl' 'cookielifetime'</tags>
+    <spec>'cookielifetime'</spec>
+    <type>string</type>
+    <default>default</default>
+    <description>
+        <p>
+            The lifetime for which to accept cookies. The available
+            options are:
+        </p>
+        <dl>
+            <dt>default</dt>     <dd>The lifetime requested by the setter</dd>
+            <dt>prompt</dt>      <dd>Always prompt for a lifetime</dd>
+            <dt>session</dt>     <dd>The current session</dd>
+            <dt><a>days</a></dt> <dd>When a number is given, it is
+                interpreted as the number of days for which to keep
+                cookies</dd>
+        </dl>
+    </description>
+</item>
+
+<item>
+    <tags>'ck' 'cookies'</tags>
+    <spec>'cookies' 'ck'</spec>
+    <type>stringlist</type> <default>session</default>
+    <description>
+        <p>The default action for the <ex>:cookies</ex> command.</p>
+    </description>
+</item>
+
 <item>
     <tags>'cpt' 'complete'</tags>
     <spec>'complete' 'cpt'</spec>

common/locale/en-US/various.xml

@@ -221,6 +221,38 @@
     </description>
 </item>
 
+<h3 tag="cookie-settings">Cookie Settings</h3>
+<item>
+    <tags>:cookies :ck</tags>
+    <spec>:cookies <a>host</a> <oa>action</oa> …</spec>
+    <description>
+        <p>
+            Manage cookies for <a>host</a>. Additionally, the completion
+            list will show you information about the cookies and
+            permissions for the current page.
+        </p>
+
+        <p>Available actions:</p>
+
+        <dl>
+            <dt>unset</dt>            <dd>Unset special permissions for <a>host</a></dd>
+            <dt>allow</dt>            <dd>Allow cookies from <a>host</a></dd>
+            <dt>deny</dt>             <dd>Deny cookies from <a>host</a></dd>
+            <dt>session</dt>          <dd>Allow cookies from <a>host</a> for the current session</dd>
+            <dt>list</dt>             <dd>List all cookies for <a>host</a></dd>
+            <dt>clear</dt>            <dd>Clear all cookies for <a>host</a></dd>
+            <dt>clear-persistent</dt> <dd>Clear all persistent cookies for <a>host</a></dd>
+            <dt>clear-session</dt>    <dd>Clear all session cookies for <a>host</a></dd>
+        </dl>
+
+        <p>
+            If no <oa>action</oa> is given, the value of <o>cookies</o> is used.
+        </p>
+
+        <example>:map -b c :cookies <k name="A-Tab"/></example>
+    </description>
+</item>
+
 <h2 tag="online-help">Online help</h2>
 
 <item>