Connection is not Secure in Mozilla Firefox Browser
Your Connection to this site is not fully secure in Chrome Browser
Google Chrome Browser shows “Not Secure” Message.
What Is Mixed Content?
The above or similar message is displayed by many of the browser in the situation when the site is https and has SSL certificate but some of the links in hyperlinked pages are not Secure. In other words the URL written in <a href=’http://www.WebsiteName.com’></a> works on http protocol which is Not Secure.
So to avoid these messages all links should have SSL certification or https. It is recommended replace every https:// or http:// by just // in the URL.
Following are most common problems that often observed –
You should use the // prefix. (instead of http[s]://)
• On an https page, the secure version wil be loaded.
• On on a plain http page, the plain http version will be loaded.
Edit your theme replacing every occurence of http://fonts.googleapis.com/… with //fonts.googleapis.com/…
Edit your theme replacing every occurency of http://fonts.googleapis.com/… with https://fonts.googleapis.com/… (mind the s).
Resources that might pose a security risk (such as scripts and fonts) must be loaded through a secure connection when requested in the context of a secured page for an obvious reason: they could have been manipulated along the way.