diff --git a/files/en-us/mozilla/firefox/releases/87/index.html b/files/en-us/mozilla/firefox/releases/87/index.html
index b72ab23ba030a0f..b1a05df2a290c1e 100644
--- a/files/en-us/mozilla/firefox/releases/87/index.html
+++ b/files/en-us/mozilla/firefox/releases/87/index.html
@@ -42,6 +42,23 @@ <h3 id="CSS">CSS</h3>
 <h4 id="Removals_3">Removals</h4>
 
 <ul>
+  <li>The following Firefox-specific theme-related media features have been disabled for use in web pages ({{bug(787521)}}):
+    <ul>
+      <li><code>-moz-mac-graphite-theme</code></li>
+      <li><code>-moz-mac-lion-theme</code></li>
+      <li><code>-moz-maemo-classic</code></li>
+      <li><code>-moz-windows-classic</code></li>
+      <li><code>-moz-windows-compositor</code></li>
+      <li><code>-moz-windows-default-theme</code></li>
+      <li><code>-moz-windows-theme</code></li>
+      <li><code>-moz-scrollbar-end-backward</code></li>
+      <li><code>-moz-scrollbar-end-forward</code></li>
+      <li><code>-moz-scrollbar-start-backward</code></li>
+      <li><code>-moz-scrollbar-start-forward</code></li>
+      <li><code>-moz-scrollbar-thumb-proportional</code></li>
+      <li><code>-moz-menubar-drag</code></li>
+    </ul>
+  </li>
   <li>The non-standard values of {{cssxref("caption-side")}} (<code>left</code>, <code>right</code>, <code>top-outside</code>, and <code>bottom-outside</code>) have been removed and placed behind the <code>layout.css.caption-side-non-standard.enabled</code> flag ({{bug(1688695)}}).</li>
   <li>The {{HTMLElement("link")}} element is no longer matched by {{cssxref(":link")}}, {{cssxref(":visited")}}, or {{cssxref(":any-link")}}. This aligns the behavior in Firefox to existing behavior in Chrome and to a recent spec change ({{bug(1687538)}}).</li>
 </ul>
diff --git a/files/en-us/web/css/mozilla_extensions/index.html b/files/en-us/web/css/mozilla_extensions/index.html
index 06025ab1b6ea825..199647b7c429b3a 100644
--- a/files/en-us/web/css/mozilla_extensions/index.html
+++ b/files/en-us/web/css/mozilla_extensions/index.html
@@ -643,22 +643,10 @@ <h2 id="Media_features">Media features</h2>
 
 <div class="index">
 <ul>
- <li>{{CSSxRef("@media/-moz-mac-graphite-theme", "-moz-mac-graphite-theme")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-maemo-classic", "-moz-maemo-classic")}}{{gecko_minversion_inline("1.9.2")}}</li>
  <li>{{CSSxRef("@media/-moz-device-pixel-ratio", "-moz-device-pixel-ratio")}}{{gecko_minversion_inline("2.0")}}</li>
  <li>{{CSSxRef("@media/-moz-os-version", "-moz-os-version")}}</li>
- <li>{{CSSxRef("@media/-moz-scrollbar-end-backward", "-moz-scrollbar-end-backward")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-scrollbar-end-forward", "-moz-scrollbar-end-forward")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-scrollbar-start-backward", "-moz-scrollbar-start-backward")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-scrollbar-start-forward", "-moz-scrollbar-start-forward")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-scrollbar-thumb-proportional", "-moz-scrollbar-thumb-proportional")}}{{gecko_minversion_inline("1.9.2")}}</li>
  <li>{{CSSxRef("@media/-moz-touch-enabled", "-moz-touch-enabled")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-windows-accent-color-in-titlebar", "-moz-windows-accent-color-in-titlebar")}}</li>
- <li>{{CSSxRef("@media/-moz-windows-classic", "-moz-windows-classic")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-windows-compositor", "-moz-windows-compositor")}}{{gecko_minversion_inline("1.9.2")}}</li>
- <li>{{CSSxRef("@media/-moz-windows-default-theme", "-moz-windows-default-theme")}}{{gecko_minversion_inline("1.9.2")}}</li>
  <li>{{CSSxRef("@media/-moz-windows-glass", "-moz-windows-glass")}}</li>
- <li>{{CSSxRef("@media/-moz-windows-theme", "-moz-windows-theme")}}{{gecko_minversion_inline("2.0")}}</li>
 </ul>
 </div>