The OP wasn't asking about WWW::Mechanize::Firefox.

That one is a .ppd package, is easy and painless to install using ppm. I do have it installed on this machine and have done some testing with it. I don't know what other functionality that this set of packages that the OP wants provides. But if you mean: "Hey, WWW::Mechanize::Firefox is easy to install and play with", I would agree with that... It is certainly possible that something is being asked for that can be done an easier way, an XY problem XY Problem.