Mixed content warning when using SSL

I use an SSL certificate on my site and I am receiving a mixed content warning when this plugin is enabled. When the plugin is disabled I get no mixed content warnings. This is because I have changed all references to Google Fonts from http to https
in my template. When I enable the JUX Coming Soon plugin, I get the following errors:

Blocked loading mixed active content http:// fonts.googleapis.com/css?family=Open+Sans:300italic
Blocked loading mixed active content http:// fonts.googleapis.com/css?family=Lato:300
Blocked loading mixed active content http:// fonts.googleapis.com/css?family=Lato:300|Coustard:900

I tried to remedy this by logging into the plugin and under the 'plugin' tab, changing the custom font from
http:// fonts.googleapis.com/css?family=Lato:300,400,300italic
to
https:// fonts.googleapis.com/css?family=Lato:300,400,300italic
but this did not fix the issue. Please advise.

Edit: For some reason your forum is truncating the http:// and https:// in the above text as I was explaining my issue.

Ho O Walton.
Thank you for using our product.
I'm sorry for reply late
Please give me link your site and your account of administrator via mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
I will check it for you

Was this ever fixed? I just purchased this product and I am also encountering the same issue and the suggested work-around posted in the OP does not resolve the problem. I am using Joomla 3.7.4 with PHP 5.60 and the latest JUX Coming Soon.

Hello JayBee,

I did as the developer instructed and contacted her via email. She NEVER replied. I eventually figured it out myself. If you have SSH or FTP access to your site, navigate to the following directory: ~/public_html/plugins/system/juxcomingsoon/ then open the juxcomingsoon.php file. In there you will see 3 references to $jux_font_style==" fonts.googleapis.com/css ... Just add an "s" to the http and you're all set. Good luck.

O