Cannot Start The Driver Service On Http Localhost Selenium Firefox C [exclusive] Jun 2026

Compatibility issues between the browser and driver are a frequent cause of startup failures. Stack Overflow Version Match: Ensure your geckodriver version supports your current Firefox version. Architecture: Check if you are running a binary on a

Then use:

Another process (another Selenium session, a zombie GeckoDriver, or a different application) is already using the port that GeckoDriver wants. Compatibility issues between the browser and driver are