diff --git a/.storybook/mocks/firebase.js b/.storybook/mocks/firebase.js
index 2b1b7175683..d89810cb686 100644
--- a/.storybook/mocks/firebase.js
+++ b/.storybook/mocks/firebase.js
@@ -20,6 +20,7 @@ const firebase = {
         delete: () => {},
         onSnapshot: (callback) => {
           callback({ data: () => {}, get: () => {} })
+          return () => {}
         },
       }),
     }),
diff --git a/src/features/favorites/pages/Favorites.perf.test.tsx b/src/features/favorites/pages/Favorites.perf.test.tsx
index f218d26f54c..92f92db8bee 100644
--- a/src/features/favorites/pages/Favorites.perf.test.tsx
+++ b/src/features/favorites/pages/Favorites.perf.test.tsx
@@ -7,12 +7,17 @@ import { paginatedFavoritesResponseSnap } from 'features/favorites/fixtures/pagi
 import { simulateBackend } from 'features/favorites/helpers/simulateBackend'
 import { Favorites } from 'features/favorites/pages/Favorites'
 import { beneficiaryUser } from 'fixtures/user'
+import * as useFeatureFlagAPI from 'libs/firebase/firestore/featureFlags/useFeatureFlag'
+import { RemoteStoreFeatureFlags } from 'libs/firebase/firestore/types'
 import { decodedTokenWithRemainingLifetime } from 'libs/jwt/fixtures'
 import { storage } from 'libs/storage'
 import { mockServer } from 'tests/mswServer'
 import { reactQueryProviderHOC } from 'tests/reactQueryProviderHOC'
 import { measurePerformance, screen } from 'tests/utils'
 
+jest.mock('libs/firebase/firestore/exchangeRates/useGetPacificFrancToEuroRate')
+const useFeatureFlagSpy = jest.spyOn(useFeatureFlagAPI, 'useFeatureFlag')
+
 jest.mock('libs/firebase/analytics/analytics')
 
 jest.mock('features/favorites/context/FavoritesWrapper')
@@ -39,6 +44,7 @@ jest.mock('libs/network/NetInfoWrapper')
 
 describe('<Favorites />', () => {
   beforeEach(() => {
+    activateFeatureFlags([RemoteStoreFeatureFlags.ENABLE_PACIFIC_FRANC_CURRENCY])
     mockServer.getApi<UserProfileResponse>('/v1/me', beneficiaryUser)
   })
 
@@ -59,3 +65,7 @@ describe('<Favorites />', () => {
     )
   })
 })
+
+const activateFeatureFlags = (activeFeatureFlags: RemoteStoreFeatureFlags[] = []) => {
+  useFeatureFlagSpy.mockImplementation((flag) => activeFeatureFlags.includes(flag))
+}