<P> HTTPS should not be confused with the little - used Secure HTTP (S - HTTP) specified in RFC 2660 . </P> <P> As of April 2018, 33.2% of Alexa top 1,000,000 websites use HTTPS as default, 57.1% of the Internet's 137,971 most popular websites have a secure implementation of HTTPS, and 70% of page loads (measured by Firefox Telemetry) use HTTPS . </P> <P> Most browsers display a warning if they receive an invalid certificate . Older browsers, when connecting to a site with an invalid certificate, would present the user with a dialog box asking whether they wanted to continue . Newer browsers display a warning across the entire window . Newer browsers also prominently display the site's security information in the address bar . Extended validation certificates turn the address bar green in newer browsers . Most browsers also display a warning to the user when visiting a site that contains a mixture of encrypted and unencrypted content . </P> <P> The Electronic Frontier Foundation, opining that "In an ideal world, every web request could be defaulted to HTTPS", has provided an add - on called HTTPS Everywhere for Mozilla Firefox that enables HTTPS by default for hundreds of frequently used websites . A beta version of this plugin is also available for Google Chrome and Chromium . </P>

The most secure communications over the internet use a protocol called http