diff --git a/content/dark_addons_manager.css b/content/dark_addons_manager.css
new file mode 100644
index 0000000..659c9d8
--- /dev/null
+++ b/content/dark_addons_manager.css
@@ -0,0 +1,23 @@
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+@namespace html url("http://www.w3.org/1999/xhtml");
+
+@-moz-document url("about:addons"){
+  :root{
+    --in-content-page-color: rgb(210,210,210) !important;
+    --in-content-text-color: rgb(210,210,210) !important;
+    --in-content-page-background: rgb(46,54,69) !important;
+    --in-content-box-background: rgba(255,255,255,0.1) !important;
+  }
+  .message-bar,.alert{
+    background-color: var(--in-content-box-background) !important;
+    color: var(--in-content-text-color) !important;
+  }
+}
+@-moz-document url-prefix("https://discovery.addons.mozilla.org/"){
+  html|*{ color: inherit !important; }
+  html|html,html|body{
+    background-color: rgb(46,54,69) !important;
+    color: rgb(210,210,210) !important;
+  }
+  html|div.addon,html|div.Notice{ background-color: rgba(255,255,255,0.1) !important; }
+}
\ No newline at end of file