Restart your IDE (Visual Studio / Rider) for the changes to take effect. 2. Terminate Hanging Background Processes
| Category | Common Root Causes | Target Audience | | :--- | :--- | :--- | | | Discrepancy between versions of Selenium, GeckoDriver, and Firefox | All | | 📁 Configuration & PATH Errors | Incorrect driver path, missing or mismatched DLLs in .NET projects | .NET Developers | | 🚀 Concurrency & System Resource Limits | Starting too many browser instances simultaneously, system resource exhaustion | All, especially for parallel test execution | | 💻 Environment-Specific Constraints | Issues unique to virtual machines (VMs), CI/CD pipelines, or Linux distributions (like Snap) | QA Engineers, DevOps | Restart your IDE (Visual Studio / Rider) for
service = Service(r'C:\path\to\geckodriver.exe') driver = webdriver.Firefox(service=service) driver.get('https://www.google.com') system resource exhaustion | All
— a brute-force but effective way to clear all stale processes. Restart your IDE (Visual Studio / Rider) for
