Uservoice classic widgets appears in production environment but doesn't appear in developpement environement

I got ruby on rails project that i just install in my localhost, this project contains some uservoice classic widgets. these widgets appear on the hosted project and whenever I try run rails s in my localhost the project started without showing these widgest. when I try rails s -e production th widgest appear on the project.

Can you please explain to me this issue ? and how can I let the widgest runs in developement environement while running rails s

Thank you