Unfortunately the installation still fails

That be tests failing, not the installation, failing tests can be ignored you know

WWW::Mechanize::Firefox::Installation - How to install the components

WWW::Mechanize::Firefox::Troubleshooting - Things to watch out for

Crossposted at http://stackoverflow.com/questions/28181577/problems-while-installing-wwwmechanizefirefox. I cross-linked this cross-postings for maximum collaboration efficiency