Cannot Start The Driver Service On Http — Localhost Selenium Firefox C New!
If you are reading this, you have likely been staring at a red, intimidating stack trace in your console. The error message, often truncated as cannot start the driver service on http://localhost when using Selenium with Firefox, is a classic automation roadblock.
Update Firefox to the latest version and download the corresponding GeckoDriver releases from GitHub . If you are reading this, you have likely
If you still face the issue after following this guide, check the exact stack trace for clues like "Connection refused" (firewall) or "Permission denied" (Unix file modes). When in doubt, restart your machine, reinstall both Firefox and GeckoDriver, and run the minimal script as a standard (non-admin) user. If you are reading this