Selenium Multi-thread Ruby Script

As the title mention, I would need a multi-threaded selenium script that uses either chrome or chromium or firefox (if you can get pass the cert issues). I would be running this against 500,000 internal address, hence the threaded part. The script would need to bypass certificate errors, an example would be for it to run against: [login to view URL] and print the page, if you and I visit the page now it will say insecure connection, the script would need to use the browser bypass flags to overcome this. I would love to have it done in ruby, but python is fine if no bids for ruby version.