diff --git a/desktop/src/main.tsx b/desktop/src/main.tsx
index 890ef72226..58a17bbf32 100644
--- a/desktop/src/main.tsx
+++ b/desktop/src/main.tsx
@@ -14,6 +14,7 @@ import { PoofBurstProvider } from "@/shared/ui/PoofBurstProvider";
 import { Toaster } from "@/shared/ui/sonner";
 import { TooltipProvider } from "@/shared/ui/tooltip";
 import { recoverLocalStorageQuotaOnStartup } from "@/shared/lib/localStorageQuota";
+import { isLinuxPlatform } from "@/shared/lib/platform";
 
 type E2eWindow = Window & {
   __BUZZ_E2E__?: unknown;
@@ -108,9 +109,16 @@ async function installE2eBridgeIfConfigured() {
   maybeInstallE2eTauriMocks();
 }
 
+function tagPlatformClass() {
+  if (isLinuxPlatform()) {
+    document.documentElement.classList.add("platform-linux");
+  }
+}
+
 async function bootstrap() {
   resetDevWebviewStateFromUrl();
   configureDevE2eBridgeFromUrl();
+  tagPlatformClass();
   recoverLocalStorageQuotaOnStartup();
   await installE2eBridgeIfConfigured();
   await migrateLegacyCommunityStorageBeforeRender();
diff --git a/desktop/src/shared/styles/globals/motion.css b/desktop/src/shared/styles/globals/motion.css
index 25288fb1a6..f20a92a58f 100644
--- a/desktop/src/shared/styles/globals/motion.css
+++ b/desktop/src/shared/styles/globals/motion.css
@@ -117,3 +117,9 @@
 ::view-transition-new(root) {
   animation: none;
 }
+
+/* Linux WebKitGTK has no GPU-accelerated backdrop-filter — disable it. */
+.platform-linux * {
+  backdrop-filter: none !important;
+  -webkit-backdrop-filter: none !important;
+}