diff --git a/packages/playwright-core/src/client/browserContext.ts b/packages/playwright-core/src/client/browserContext.ts
index 59dcf046be..0b5220d8f0 100644
--- a/packages/playwright-core/src/client/browserContext.ts
+++ b/packages/playwright-core/src/client/browserContext.ts
@@ -462,6 +462,7 @@ export class BrowserContext extends ChannelOwner<channels.BrowserContextChannel>
     this._disposeHarRouters();
     this.tracing._resetStackCounter();
     this.emit(Events.BrowserContext.Close, this);
+    this._mockingProxies.forEach(p => p.uninstall(this));
   }
 
   async [Symbol.asyncDispose]() {
diff --git a/packages/playwright-core/src/client/mockingProxy.ts b/packages/playwright-core/src/client/mockingProxy.ts
index 3a5869e3a4..93fe8164b3 100644
--- a/packages/playwright-core/src/client/mockingProxy.ts
+++ b/packages/playwright-core/src/client/mockingProxy.ts
@@ -41,11 +41,16 @@ export class MockingProxy extends ChannelOwner<channels.MockingProxyChannel> {
     });
   }
 
-  installOn(context: BrowserContext): void {
+  install(context: BrowserContext): void {
     context._mockingProxies.add(this);
     this._contexts.add(context);
   }
 
+  uninstall(context: BrowserContext): void {
+    context._mockingProxies.delete(this);
+    this._contexts.delete(context);
+  }
+
   async setInterceptionPatterns(params: channels.MockingProxySetInterceptionPatternsParams) {
     await this._channel.setInterceptionPatterns(params);
   }