error in js

Hi,
In this plugin php file you have js function instaemail_script_footer
which loads file from
https://pf-cdn.printfriendly.com/javascripts/email/app.js, when page uses https
next, in this file on the begining is:
if(window[‘localDev’] == undef)
var emailDomain = ‘http://email-srv.printfriendly.com’;

which couses ‘mixed-content’ error – is there possibility to fix this?

thanks in advance
Tomek