diff --git a/packages/playwright-core/src/server/firefox/ffNetworkManager.ts b/packages/playwright-core/src/server/firefox/ffNetworkManager.ts
index 2fdc8850b5..f5773dbb9b 100644
--- a/packages/playwright-core/src/server/firefox/ffNetworkManager.ts
+++ b/packages/playwright-core/src/server/firefox/ffNetworkManager.ts
@@ -50,7 +50,10 @@ export class FFNetworkManager {
   }
 
   async setRequestInterception(enabled: boolean) {
-    await this._session.send('Network.setRequestInterception', { enabled });
+    await Promise.all([
+      this._session.send('Page.setCacheDisabled', { cacheDisabled: enabled }),
+      this._session.send('Network.setRequestInterception', { enabled }),
+    ]);
   }
 
   _onRequestWillBeSent(event: Protocol.Network.requestWillBeSentPayload) {
diff --git a/tests/page/page-network-response.spec.ts b/tests/page/page-network-response.spec.ts
index b856362fa6..29e07f95bb 100644
--- a/tests/page/page-network-response.spec.ts
+++ b/tests/page/page-network-response.spec.ts
@@ -350,7 +350,6 @@ it('should return body for prefetch script', async ({ page, server, browserName
 
 it('should bypass disk cache when interception is enabled', async ({ page, server, browserName }) => {
   it.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/30000' });
-  it.fixme(browserName === 'firefox', 'Returns cached response.');
   await page.goto(server.PREFIX + '/frames/one-frame.html');
   await page.route('**/api*', route => route.continue());
   {