I have enabled `https` for my site. All images and files are served with `https` url, but favicon it is serving from `http://example.com/sites/default/files/favicon.ico` instead it should show as `https://example.com/sites/default.files/favicon.ico`. When I open the site in **Firefox** it is displaying below error message in console

> 
> Loading mixed (insecure) display content on a secure page
>  "<http://example.com/sites/default/files/favicon.ico>"[Learn More]
> 
> 
> 

Suggest me a way to resolve this.