diff --git a/apps/browser/src/auth/popup/guards/platform-popout.guard.ts b/apps/browser/src/auth/popup/guards/platform-popout.guard.ts
index aad005e141b..c1218d918e2 100644
--- a/apps/browser/src/auth/popup/guards/platform-popout.guard.ts
+++ b/apps/browser/src/auth/popup/guards/platform-popout.guard.ts
@@ -1,7 +1,10 @@
 import { ActivatedRouteSnapshot, CanActivateFn, RouterStateSnapshot } from "@angular/router";
 
+import { DeviceType } from "@bitwarden/common/enums";
+
 import { BrowserApi } from "../../../platform/browser/browser-api";
 import BrowserPopupUtils from "../../../platform/browser/browser-popup-utils";
+import { BrowserPlatformUtilsService } from "../../../platform/services/platform-utils/browser-platform-utils.service";
 
 /**
  * Guard that forces a popout window for specific platforms.
@@ -44,3 +47,35 @@ export function platformPopoutGuard(
     return true; // Allow navigation
   };
 }
+
+/**
+ * Guard that forces a popout window on Firefox browser when a file picker could be exposed.
+ * Necessary to avoid a crash: https://bugzilla.mozilla.org/show_bug.cgi?id=1292701
+ * Also disallows the user from closing a popout and re-opening the view exposing the file picker.
+ *
+ * @returns CanActivateFn that opens popout and blocks navigation on Firefox
+ */
+export function firefoxPopoutGuard(): CanActivateFn {
+  return async (_route: ActivatedRouteSnapshot, state: RouterStateSnapshot) => {
+    // Check if browser is Firefox using the platform utils service
+    const deviceType = BrowserPlatformUtilsService.getDevice(window);
+    const isFirefox = deviceType === DeviceType.FirefoxExtension;
+
+    // Check if already in popout/sidebar
+    const inPopout = BrowserPopupUtils.inPopout(window);
+    const inSidebar = BrowserPopupUtils.inSidebar(window);
+
+    // Open popout if on Firefox and not already in popout/sidebar
+    if (isFirefox && !inPopout && !inSidebar) {
+      // Don't add autoClosePopout for file picker scenarios - user should manually close
+      await BrowserPopupUtils.openPopout(`popup/index.html#${state.url}`);
+
+      // Close the original popup window
+      BrowserApi.closePopup(window);
+
+      return false; // Block navigation - popout will reload
+    }
+
+    return true; // Allow navigation
+  };
+}
diff --git a/apps/browser/src/popup/app-routing.module.ts b/apps/browser/src/popup/app-routing.module.ts
index 48f06147cdf..14ff3c4a47a 100644
--- a/apps/browser/src/popup/app-routing.module.ts
+++ b/apps/browser/src/popup/app-routing.module.ts
@@ -48,7 +48,10 @@ import { LockComponent, ConfirmKeyConnectorDomainComponent } from "@bitwarden/ke
 import { AccountSwitcherComponent } from "../auth/popup/account-switching/account-switcher.component";
 import { AuthExtensionRoute } from "../auth/popup/constants/auth-extension-route.constant";
 import { fido2AuthGuard } from "../auth/popup/guards/fido2-auth.guard";
-import { platformPopoutGuard } from "../auth/popup/guards/platform-popout.guard";
+import {
+  firefoxPopoutGuard,
+  platformPopoutGuard,
+} from "../auth/popup/guards/platform-popout.guard";
 import { AccountSecurityComponent } from "../auth/popup/settings/account-security.component";
 import { ExtensionDeviceManagementComponent } from "../auth/popup/settings/extension-device-management.component";
 import { Fido2Component } from "../autofill/popup/fido2/fido2.component";
@@ -246,7 +249,7 @@ const routes: Routes = [
   {
     path: "import",
     component: ImportBrowserV2Component,
-    canActivate: [authGuard],
+    canActivate: [authGuard, firefoxPopoutGuard()],
     data: { elevation: 1 } satisfies RouteDataProperties,
   },
   {
@@ -324,13 +327,13 @@ const routes: Routes = [
   {
     path: "add-send",
     component: SendAddEditV2Component,
-    canActivate: [authGuard],
+    canActivate: [authGuard, firefoxPopoutGuard()],
     data: { elevation: 1 } satisfies RouteDataProperties,
   },
   {
     path: "edit-send",
     component: SendAddEditV2Component,
-    canActivate: [authGuard],
+    canActivate: [authGuard, firefoxPopoutGuard()],
     data: { elevation: 1 } satisfies RouteDataProperties,
   },
   {