[py] Use Chrome instead of Firefox for internal Remote tests

[cgoldberg]

User description

🔗 Related Issues

Fixes #16417

💥 What does this PR do?

This PR updates the internal Python test suite and CI job to use Chrome instead of Firefox for Remote tests.

This also updates the driver fixture to cleanup downloaded files between tests if running a Remote WebDriver so we don't leak between tests if we don't close the browser.

🔄 Types of changes

• Test/CI

---

PR Type

Tests

---

Description

• Switch Remote WebDriver tests from Firefox to Chrome

• Update test fixtures to use chromium_options instead of firefox_options

• Modify CI workflow to run remote tests with Chrome browser

• Change default Remote options configuration from Firefox to Chrome

---

Diagram Walkthrough

flowchart LR
  A["conftest.py"] -- "Update default options" --> B["Remote: Firefox → Chrome"]
  C["remote_connection_tests.py"] -- "Replace fixtures" --> D["chromium_options"]
  E["remote_custom_locator_tests.py"] -- "Replace fixtures" --> D
  F[".github/workflows/ci-python.yml"] -- "Update CI" --> G["browser: chrome"]

Loading

File Walkthrough

	Relevant files
Configuration changes	conftest.py Update Remote driver default options to Chrome                      py/conftest.py Changed remote driver default options from FirefoxOptions to ChromeOptions Updated Remote driver initialization to use Chrome capabilities (goog:chromeOptions) Removed Firefox-specific Wayland environment configuration for Remote driver +3/-3      ci-python.yml Switch CI remote tests to Chrome browser                                  .github/workflows/ci-python.yml Updated CI workflow matrix to use chrome instead of firefox for remote tests +1/-1
Tests	remote_connection_tests.py Switch Remote test fixtures from Firefox to Chrome              py/test/selenium/webdriver/remote/remote_connection_tests.py Replaced firefox_options fixture with chromium_options in timeout tests Moved Firefox-specific screenshot test to use explicit Firefox options Updated BiDi test to use Chrome options instead of Firefox +13/-11  remote_custom_locator_tests.py Update custom locator test to use Chrome options                  py/test/selenium/webdriver/remote/remote_custom_locator_tests.py Changed custom locator driver fixture from firefox_options to chromium_options +2/-2

---

[cgoldberg]

I found the weirdest Chrome issue while working on this PR. Any file the test tries to download gets downloaded as an *.html file instead of the correct file extension. I can't reproduce it when manually launching the same browser... but when driven by chromedriver, it renames the files (like file_1.txt downloads as file_1.html).

I have the tests altered to compensate for this, but I have no idea what is going on.