[py] Update Firefox tests to use driver fixture

Author: cgoldberg

py/BUILD.bazel

@@ -363,7 +363,6 @@ py_library(
         "test/selenium/webdriver/common/network.py",
         "test/selenium/webdriver/common/webserver.py",
         "test/selenium/webdriver/firefox/__init__.py",
-        "test/selenium/webdriver/firefox/conftest.py",
         "test/selenium/webdriver/marionette/__init__.py",
         "test/selenium/webdriver/marionette/conftest.py",
         "test/selenium/webdriver/safari/conftest.py",

py/conftest.py

@@ -464,6 +464,7 @@ def clean_driver(request):
         pytest.xfail(**marker.kwargs)
 
     yield driver_reference
+
     if request.node.get_closest_marker("no_driver_after_test"):
         driver_reference = None
 

py/pyproject.toml

@@ -24,15 +24,15 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
-    ]
+]
 dependencies = [
     "urllib3[socks]>=2.5.0,<3.0",
     "trio>=0.30.0,<1.0",
     "trio-websocket>=0.12.2,<1.0",
     "certifi>=2025.6.15",
     "typing_extensions>=4.14.0,<5.0",
     "websocket-client>=1.8.0,<2.0",
-    ]
+]
 
 [project.urls]
 homepage = "https://www.selenium.dev"

py/test/selenium/webdriver/firefox/conftest.py

@@ -18,12 +18,21 @@
 import os
 import zipfile
 
+import pytest
+
 from selenium.webdriver.common.by import By
 from selenium.webdriver.support.wait import WebDriverWait
 
-extensions = os.path.abspath("../../../../../../test/extensions/")
+for extensions_dir in (
+    os.path.abspath("../../../../../../test/extensions/"),
+    os.path.abspath("../common/extensions/"),
+):
+    extensions = extensions_dir
+    if os.path.exists(extensions_dir):
+        break
 
 
+@pytest.mark.no_driver_after_test
 def test_install_uninstall_signed_addon_xpi(driver, pages):
     extension = os.path.join(extensions, "webextensions-selenium-example.xpi")
 
@@ -41,6 +50,7 @@ def test_install_uninstall_signed_addon_xpi(driver, pages):
     assert len(driver.find_elements(By.ID, "webextensions-selenium-example")) == 0
 
 
+@pytest.mark.no_driver_after_test
 def test_install_uninstall_signed_addon_zip(driver, pages):
     extension = os.path.join(extensions, "webextensions-selenium-example.zip")
 
@@ -58,6 +68,7 @@ def test_install_uninstall_signed_addon_zip(driver, pages):
     assert len(driver.find_elements(By.ID, "webextensions-selenium-example")) == 0
 
 
+@pytest.mark.no_driver_after_test
 def test_install_uninstall_unsigned_addon_zip(driver, pages):
     extension = os.path.join(extensions, "webextensions-selenium-example-unsigned.zip")
 
@@ -75,6 +86,7 @@ def test_install_uninstall_unsigned_addon_zip(driver, pages):
     assert len(driver.find_elements(By.ID, "webextensions-selenium-example")) == 0
 
 
+@pytest.mark.no_driver_after_test
 def test_install_uninstall_signed_addon_dir(driver, pages):
     zip = os.path.join(extensions, "webextensions-selenium-example.zip")
 
@@ -96,6 +108,7 @@ def test_install_uninstall_signed_addon_dir(driver, pages):
     assert len(driver.find_elements(By.ID, "webextensions-selenium-example")) == 0
 
 
+@pytest.mark.no_driver_after_test
 def test_install_uninstall_unsigned_addon_dir(driver, pages):
     zip = os.path.join(extensions, "webextensions-selenium-example-unsigned.zip")
     target = os.path.join(extensions, "webextensions-selenium-example-unsigned-unzip")