diff --git a/pages/copyvios.mako b/pages/copyvios.mako
index 12ac0c6..dad6636 100644
--- a/pages/copyvios.mako
+++ b/pages/copyvios.mako
@@ -1,7 +1,8 @@
 <%include file="/support/header.mako" args="environ=environ, title='Copyvio Detector', add_css=('copyvios.css',), add_js=('copyvios.js',)"/>\
 <%namespace module="toolserver.copyvios" import="main, highlight_delta"/>\
-<%namespace module="toolserver.misc" import="urlstrip"/>\
+<%namespace module="toolserver.misc" import="parse_cookies, urlstrip"/>\
 <% query, bot, all_langs, all_projects, page, result = main(environ) %>
+<% cookies = parse_cookies(environ) %>
             <h1>Copyvio Detector</h1>
             <p>This tool attempts to detect <a href="//en.wikipedia.org/wiki/WP:COPYVIO">copyright violations</a> in articles. Simply give the title of the page you want to check and hit Submit. The tool will then search for its content elsewhere on the web and display a report if a similar webpage is found. If you also provide a URL, it will not query any search engines and instead display a report comparing the article to that particular webpage, like the <a href="//toolserver.org/~dcoetzee/duplicationdetector/">Duplication Detector</a>. Check out the <a href="//en.wikipedia.org/wiki/User:EarwigBot/Copyvios/FAQ">FAQ</a> for more information and technical details.</p>
             <form action="${environ['PATH_INFO']}" method="get">
@@ -94,9 +95,17 @@
                         % else:
                             <li>Results generated in <tt>${round(result.tdiff, 3)}</tt> seconds using <tt>${result.queries}</tt> queries.</li>
                         % endif
-                        <li><a id="cv-result-detail-link" href="#cv-result-detail" onclick="copyvio_toggle_details()">Show details:</a></li>
+                        % if "EarwigCVShowDetails" cookies and cookies["EarwigCVShowDetails"] == "True":
+                            <li><a id="cv-result-detail-link" href="#cv-result-detail" onclick="copyvio_toggle_details()">Hide details:</a></li>
+                        % else:
+                            <li><a id="cv-result-detail-link" href="#cv-result-detail" onclick="copyvio_toggle_details()">Show details:</a></li>
+                        % endif
                     </ul>
-                    <div id="cv-result-detail" style="display: none;">
+                    % if "EarwigCVShowDetails" cookies and cookies["EarwigCVShowDetails"] == "True":
+                        <div id="cv-result-detail" style="display: block;">
+                    % else:
+                        <div id="cv-result-detail" style="display: none;">
+                    % endif
                         <ul id="cv-result-detail-list">
                             <li>Trigrams: <i>Article:</i> <tt>${result.article_chain.size()}</tt> / <i>Source:</i> <tt>${result.source_chain.size()}</tt> / <i>Delta:</i> <tt>${result.delta_chain.size()}</tt></li>
                             % if result.cached:
diff --git a/pages/extensions.mako b/pages/extensions.mako
deleted file mode 100644
index e987d60..0000000
--- a/pages/extensions.mako
+++ /dev/null
@@ -1,2 +0,0 @@
-<%include file="/support/header.mako" args="environ=environ, title='File Extension Checker'"/>
-<%include file="/support/footer.mako" args="environ=environ"/>
diff --git a/pages/index.mako b/pages/index.mako
index e2d4ff0..73b78ce 100644
--- a/pages/index.mako
+++ b/pages/index.mako
@@ -5,7 +5,6 @@
         ("Home", "home", "index", True, None),
         ("Copyvio Detector", "copyvios", "copyvios", True, "Blah"),
         ("EarwigBot Status", "earwigbot", "earwigbot", True, "Blah"),
-        ("File Extension Checker", "extensions", "extensions", False, "Blah"),
         ("Contribution Surveyor", "surveyor", "surveyor", False, "Blah"),
         ("SWMT Helper", "swmt", "swmt", False, "Blah"),
     ]
diff --git a/static/js/copyvios.js b/static/js/copyvios.js
index 30a3ed2..a4257b8 100644
--- a/static/js/copyvios.js
+++ b/static/js/copyvios.js
@@ -1,12 +1,49 @@
+// Thanks to http://www.quirksmode.org/js/cookies.html for the cookie code.
+
+function get_cookie(name) {
+    var nameEQ = name + "=";
+    var ca = document.cookie.split(";");
+    for (var i = 0; i < ca.length; i++) {
+        var c = ca[i];
+        while (c.charAt(0) == " ") {
+            c = c.substring(1, c.length);
+        }
+        if (c.indexOf(nameEQ) == 0) {
+            return c.substring(nameEQ.length, c.length);
+        }
+    }
+    return null;
+}
+
+function set_cookie(name, value, days) {
+    if (days) {
+        var date = new Date();
+        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+        var expires = "; expires=" + date.toGMTString();
+    }
+    else {
+        var expires = "";
+    }
+    document.cookie = name + "=" + value + expires + "; path=/~earwig";
+}
+
+function delete_cookie(name) {
+    set_cookie(name, "", -1);
+}
+
 function copyvio_toggle_details(details) {
     link = document.getElementById("cv-result-detail-link");
     details = document.getElementById("cv-result-detail");
-    
+
     if (link.innerHTML == "Show details:") {
         details.style.display = "block";
         link.innerHTML = "Hide details:";
+        set_cookie("EarwigCVShowDetails", "True", 180);
     } else {
         details.style.display = "none";
         link.innerHTML = "Show details:";
+        if (get_cookie("EarwigCVShowDetails")) {
+            delete_cookie("EarwigCVShowDetails");
+        }
     }
 }
diff --git a/toolserver/misc.py b/toolserver/misc.py
index d8530b0..8ed13e6 100644
--- a/toolserver/misc.py
+++ b/toolserver/misc.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8  -*-
 
+from Cookie import CookieError, SimpleCookie
 from os.path import expanduser
 from urlparse import parse_qs
 
@@ -45,3 +46,9 @@ def urlstrip(context, url):
     if url.endswith("/"):
         url = url[:-1]
     return url
+
+def parse_cookies(context, environ):
+    try:
+        return SimpleCookie(environ["HTTP_COOKIE"])
+    except CookieError:
+        return SimpleCookie()