HTTPS adoption has surged over the past few years, mostly thanks to the availability of free SSL/TLS certificates from Let's Encrypt. Browser vendors have also been encouraging sites to switch to HTTPS, and Google said earlier this year that Chrome would eventually mark all HTTP-only sites as 'Not Secure.'
Chrome 68 is due to be released tomorrow (at least on desktop platforms), and it's the first release that will display a 'Not secure' message in the address bar on HTTP pages.
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