Add release note for FF87

files/en-us/mozilla/firefox/releases/87/index.html

@@ -15,6 +15,10 @@ <h2 id="Changes_for_web_developers">Changes for web developers</h2>
 
 <h3 id="Developer_Tools">Developer Tools</h3>
 
+<ul>
+  <li>Developers can now use the <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#view_media_rules_for_prefers-color-scheme">Page Inspector</a> to simulate {{cssxref("@media/prefers-color-scheme", "@prefers-color-scheme")}} media queries, without having to change the operating system to light or dark mode ({{bug(1679408)}} and {{bug(1692272)}}).</li>
+</ul>
+
 <h4 id="Removals">Removals</h4>
 
 <h3 id="HTML">HTML</h3>