diff --git a/tests/async/conftest.py b/tests/async/conftest.py
index 1048be55c..a96fd3ec5 100644
--- a/tests/async/conftest.py
+++ b/tests/async/conftest.py
@@ -57,6 +57,10 @@ async def launch(**kwargs):
 
     yield launch
     for browser in browsers:
+        if browser.contexts:
+            raise Exception(
+                "Test failed to close a context it created via browser_factory fixture. Explicitly close context, or use context_factory."
+            )
         await browser.close()
 
 
@@ -64,6 +68,10 @@ async def launch(**kwargs):
 async def browser(browser_factory):
     browser = await browser_factory()
     yield browser
+    if browser.contexts:
+        raise Exception(
+            "Test failed to close a context it created via browser fixture. Explicitly close context, or use context_factory."
+        )
     await browser.close()
 
 
diff --git a/tests/async/test_har.py b/tests/async/test_har.py
index cd1c871a6..fb820232d 100644
--- a/tests/async/test_har.py
+++ b/tests/async/test_har.py
@@ -503,6 +503,7 @@ async def test_should_round_trip_har_zip(
     await expect(page_2.locator("body")).to_have_css(
         "background-color", "rgb(255, 192, 203)"
     )
+    await context_2.close()
 
 
 async def test_should_round_trip_har_with_post_data(
@@ -536,6 +537,7 @@ async def test_should_round_trip_har_with_post_data(
     assert await page_2.evaluate(fetch_function, "3") == "3"
     with pytest.raises(Exception):
         await page_2.evaluate(fetch_function, "4")
+    await context_2.close()
 
 
 async def test_should_disambiguate_by_header(
@@ -578,6 +580,7 @@ async def test_should_disambiguate_by_header(
     assert await page_2.evaluate(fetch_function, "baz2") == "baz2"
     assert await page_2.evaluate(fetch_function, "baz3") == "baz3"
     assert await page_2.evaluate(fetch_function, "baz4") == "baz1"
+    await context_2.close()
 
 
 async def test_should_produce_extracted_zip(
@@ -605,6 +608,7 @@ async def test_should_produce_extracted_zip(
     await expect(page_2.locator("body")).to_have_css(
         "background-color", "rgb(255, 192, 203)"
     )
+    await context_2.close()
 
 
 async def test_should_update_har_zip_for_context(
@@ -627,6 +631,7 @@ async def test_should_update_har_zip_for_context(
     await expect(page_2.locator("body")).to_have_css(
         "background-color", "rgb(255, 192, 203)"
     )
+    await context_2.close()
 
 
 async def test_should_update_har_zip_for_page(
@@ -649,6 +654,7 @@ async def test_should_update_har_zip_for_page(
     await expect(page_2.locator("body")).to_have_css(
         "background-color", "rgb(255, 192, 203)"
     )
+    await context_2.close()
 
 
 async def test_should_update_extracted_har_zip_for_page(
@@ -675,3 +681,4 @@ async def test_should_update_extracted_har_zip_for_page(
     await expect(page_2.locator("body")).to_have_css(
         "background-color", "rgb(255, 192, 203)"
     )
+    await context_2.close()
diff --git a/tests/sync/conftest.py b/tests/sync/conftest.py
index d7942bf90..ad2f4e297 100644
--- a/tests/sync/conftest.py
+++ b/tests/sync/conftest.py
@@ -63,6 +63,10 @@ def browser(
 ) -> Generator[Browser, None, None]:
     browser = browser_type.launch(**launch_arguments)
     yield browser
+    if browser.contexts:
+        raise Exception(
+            "Test failed to close a context it created via browser fixture. Explicitly close context, or use context fixture"
+        )
     browser.close()
 
 
diff --git a/tests/sync/test_har.py b/tests/sync/test_har.py
index 81452c9de..c5b20ed56 100644
--- a/tests/sync/test_har.py
+++ b/tests/sync/test_har.py
@@ -438,6 +438,7 @@ def test_should_round_trip_har_zip(
     page_2.goto(server.PREFIX + "/one-style.html")
     assert "hello, world!" in page_2.content()
     expect(page_2.locator("body")).to_have_css("background-color", "rgb(255, 192, 203)")
+    context_2.close()
 
 
 def test_should_round_trip_har_with_post_data(
@@ -471,6 +472,7 @@ def test_should_round_trip_har_with_post_data(
     assert page_2.evaluate(fetch_function, "3") == "3"
     with pytest.raises(Exception):
         page_2.evaluate(fetch_function, "4")
+    context_2.close()
 
 
 def test_should_disambiguate_by_header(
@@ -512,6 +514,7 @@ def test_should_disambiguate_by_header(
     assert page_2.evaluate(fetch_function, "baz2") == "baz2"
     assert page_2.evaluate(fetch_function, "baz3") == "baz3"
     assert page_2.evaluate(fetch_function, "baz4") == "baz1"
+    context_2.close()
 
 
 def test_should_produce_extracted_zip(
@@ -537,6 +540,7 @@ def test_should_produce_extracted_zip(
     page_2.goto(server.PREFIX + "/one-style.html")
     assert "hello, world!" in page_2.content()
     expect(page_2.locator("body")).to_have_css("background-color", "rgb(255, 192, 203)")
+    context_2.close()
 
 
 def test_should_update_har_zip_for_context(
@@ -557,6 +561,7 @@ def test_should_update_har_zip_for_context(
     page_2.goto(server.PREFIX + "/one-style.html")
     assert "hello, world!" in page_2.content()
     expect(page_2.locator("body")).to_have_css("background-color", "rgb(255, 192, 203)")
+    context_2.close()
 
 
 def test_should_update_har_zip_for_page(
@@ -577,6 +582,7 @@ def test_should_update_har_zip_for_page(
     page_2.goto(server.PREFIX + "/one-style.html")
     assert "hello, world!" in page_2.content()
     expect(page_2.locator("body")).to_have_css("background-color", "rgb(255, 192, 203)")
+    context_2.close()
 
 
 def test_should_update_extracted_har_zip_for_page(
@@ -601,3 +607,4 @@ def test_should_update_extracted_har_zip_for_page(
     page_2.goto(server.PREFIX + "/one-style.html")
     assert "hello, world!" in page_2.content()
     expect(page_2.locator("body")).to_have_css("background-color", "rgb(255, 192, 203)")
+    context_2.close()