Solution: webrat's save_and_open_page and open_error_files are not opening the browser automatically

If you are using webrat's features like save_and_open_page or config.open_error_files and is not automatically opening your browser then you might need to install launchy, It fails silently, I know, it should be more informative:

sudo gem install launchy

More info about launchy: http://rubygems.org/gems/launchy/