![]() ![]() If NO: Firefox falls back to using an insecure HTTP connection. If YES: Firefox upgrades the connection and establishes a secure, encrypted HTTPS connection. ![]() If you enter an insecure URL in the Firefox address bar, or if you click an insecure link on a web page, Firefox Private Browsing Windows checks if the destination website supports HTTPS. In the cases where the website does not support HTTPS, Firefox will automatically fall back and establish a connection using the legacy HTTP protocol instead: As illustrated in the Figure below, whenever you enter an insecure (HTTP) URL in Firefox’s address bar, or you click on an insecure link on a web page, Firefox will now first try to establish a secure, encrypted HTTPS connection to the website. How HTTPS by Default worksįirefox’s new HTTPS by Default policy in Private Browsing Windows represents a major improvement in the way the browser handles insecure web page addresses. In such cases, Firefox Private Browsing Windows now automatically opt into HTTPS for the best available security and privacy. While there remain many websites that don’t use HTTPS by default, a large fraction of those sites do support the optional use of HTTPS. But, since the introduction of its secure successor HTTPS, and further with the availability of free, simple website certificates, the large majority of websites now support HTTPS. In the early days of the web, the use of HTTP was dominant. The introduction of HTTP over TLS (HTTPS) fixed this privacy and security shortcoming by allowing the creation of secure, encrypted connections between your browser and the websites that support it. However, data transferred by the traditional HTTP protocol is unprotected and transferred in clear text, such that attackers are able to view, steal, or even tamper with the transmitted data. The Hypertext Transfer Protocol (HTTP) is a key protocol through which web browsers and websites communicate. What is the difference between HTTP and HTTPS? For every website you visit, Firefox will automatically establish a secure, encrypted connection over HTTPS whenever possible. ![]() We are excited to announce that, starting in Firefox 91, Private Browsing Windows will favor secure connections to the web by default. ![]()
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