diff --git a/fediverse/mastodon_cw_toggle.js b/fediverse/mastodon_cw_toggle.js
new file mode 100644
index 0000000..a82307d
--- /dev/null
+++ b/fediverse/mastodon_cw_toggle.js
@@ -0,0 +1,60 @@
+// ==UserScript==
+// @name        Mastodon CW toggle
+// @description Toggles the visibility of all statuses with content warnings.
+// @namespace   tastytea.de
+// @version     2019-05-27
+// @grant       none
+// @run-at      document-end
+// ==/UserScript==
+
+// Copyright © 2019 tastytea <tastytea@tastytea.de>.
+// License GPLv3: GNU GPL version 3 <https://www.gnu.org/licenses/gpl-3.0.html>.
+// This program comes with ABSOLUTELY NO WARRANTY. This is free software,
+// and you are welcome to redistribute it under certain conditions.
+
+// Toggle the visibility of each status with CW.
+function toggle()
+{
+    for (let status of document.getElementsByClassName("e-content"))
+    {
+        var style = status.getAttribute("style");
+        if (style.search("none") > -1)
+        {
+            style = style.replace("none", "block");
+        }
+        else
+        {
+            style = style.replace("block", "none");
+        }
+        status.setAttribute("style", style);
+    }
+}
+
+// If there is a “Show more”-button, add our “Toggle all CWs”-button, if we
+// didn't do so before.
+if (document.getElementsByClassName("status__content__spoiler-link").length > 0
+    && document.getElementById("global-cw-toggle") === null)
+{
+    // If there is no element named “column-1”, do nothing.
+    var root = document.getElementsByClassName("column-1")[0];
+    if (root == null)
+    {
+        return;
+    }
+
+    // Create a div, necessary to get the correct styling for the button.
+    var div = document.createElement("div");
+    div.setAttribute("id", "global-cw-toggle");
+    div.setAttribute("class", "status__content");
+    div.setAttribute("style", "margin-bottom: 0.5em;");
+
+    // Create the button.
+    var button = document.createElement("a");
+    button.setAttribute("class", "status__content__spoiler-link");
+    button.appendChild(document.createTextNode("Toggle all CWs"));
+
+    div.appendChild(button);
+    root.insertBefore(div, root.firstChild);
+
+    button.onclick = toggle;
+}