How do you force HTTPS in Safari?

SSL: usually a matter of certifications + security, been known to mean Single Socket Layer...

Network and internet standards are somewhat of a moving target, where security is involved.

https://duckduckgo.com/?q=SSL+in+OS+X&t=ffsb&ia=web

{There are certificates and companies whose business is to provide security via these.}

'Sandboxing' is a security device or method that can be applied to browsers and various OS.

This limits (isolates) code or what browsers and other applications can do, within those limits.

Apple Safari: see the section 'Defending Your Privacy & Security' about mid-page...

https://www.apple.com/safari/

Firefox will attempt to connect via HTTPS as will other modern browsers, and will show when

you click on the icons in browser URL window, the status of the icons & their meaning.

{Example given above of powerbookmedic URL -- it was not forced by Firefox to HTTPS.}

Firefox was reportedly using more code from Chrome (Firefox project had lost personnel to

Chrome development in the past) so they could strengthen private browsing & sandboxing.

Mozilla Developer Network:

https://developer.mozilla.org/en-US/

Perhaps one of the helpful persons whose expertise includes the online security of browsers

(Safari) & other applications that use the interwebs will see your thread questions and reply...

Good luck & happy computing! 🙂

Not sure about a plug-in to add support for HTTPS. In other browsers, the support

is automatic and browsers such as Firefox show icons with information available to

see what level of support the browser gives for security functions in specific sites.

firefox screenshot

Usually, I check manually by adding the HTTPS to a site page to see if that is supported

& how well it does, before assuming it really works. Sometimes that page prefix doesn't.

An example of a site that has or had been using a standard http: which had seen referral

of Mac users to, was a curiosity to me because the business site (IMO) should support

HTTPS. So I tried that, and find that it did. A few years ago. So if or when I refer others

to such a page where product serial number or other info is asked, I try & provide HTTPS.

example: https://www.powerbookmedic.com/identify-mac-serial.php

had been usually seen to work in standard http, but works in https.

Some sites to not have a secure standing (according to browser) if the prefix is changed to 'S'.

My first browser of choice is Firefox, having older Macs that have unsupported Safari versions.

{So my oldest are using a for PPC custom build of Mozilla Firefox, by name of TenFourFox.}

Safari Extensions Gallery does not specifically show an HTTPS item:

https://extensions.apple.com/

However I use three different browsers in my most modern OS X, in latest Macintosh. Most

sites that support HTTPS or have their page so addressed, just work. Testing others to see

if they actually have a second page that could be more secure, can be another matter.

Good luck in any event! 🙂