Please note that if you have recently activated a FistHost SSL certificate for your domain, it can take up to 30 minutes to be installed across our load balancers.
After an SSL has been installed, the website still loads with an insecure warning
Finding Mixed Content
Alternatively, you can use the site ‘Why No Padlock?’ to identify mixed content: https://www.whynopadlock.com/
If the site is running WordPress, you can use the SSL Insecure Content Fixer plugin that should identify all mixed content and replace it with a secure version for you. You can find the plugin here: https://en-gb.wordpress.org/plugins/ssl-insecure-content-fixer/
Once all references on your website are called using https:// URLs, your site will load securely in your browser.