fix: Only apply transparent background to windows of type navigator:browser, b=no-bug, c=common

src/toolkit/components/asyncshutdown/AsyncShutdown-sys-mjs.patch

@@ -1,28 +0,0 @@
-diff --git a/toolkit/components/asyncshutdown/AsyncShutdown.sys.mjs b/toolkit/components/asyncshutdown/AsyncShutdown.sys.mjs
-index 2aaef80411b2cef9563c49f23d36b08222b06b03..7bd15ebb0d9d09da57a287b47beb1f0e2e17d229 100644
---- a/toolkit/components/asyncshutdown/AsyncShutdown.sys.mjs
-+++ b/toolkit/components/asyncshutdown/AsyncShutdown.sys.mjs
-@@ -492,6 +492,23 @@ function getPhase(topic) {
-       }
-       return undefined;
-     },
-+
-+    /**
-+     * Reset the phase after a call to _trigger().
-+     * For testing purposes only.
-+     */
-+    get _reset() {
-+      let accepted = Services.prefs.getBoolPref(
-+        "toolkit.asyncshutdown.testing",
-+        false
-+      );
-+      if (accepted) {
-+        return () => {
-+          spinner = new Spinner(topic);
-+        };
-+      }
-+      return undefined;
-+    },
-   });
-   gPhases.set(topic, phase);
-   return phase;

src/zen/common/styles/zen-theme.css

@@ -9,7 +9,7 @@
  */
 
 :host(:is(.anonymous-content-host, notification-message)),
-:root:not([windowtype^="Browser:"]) {
+:root {
   /* Default values */
   --zen-border-radius: 7px;
   --zen-primary-color: AccentColor;
@@ -288,7 +288,7 @@
   }
 }
 
-#main-window:not([chromehidden~='toolbar']) {
+#main-window[windowtype="navigator:browser"]:not([chromehidden~='toolbar']) {
   min-height: 495px !important;
 
   @media (-moz-windows-mica) or (-moz-platform: macos) or ((-moz-platform: linux) and