Mozilla has released Firefox 91, which includes some new privacy improvements as well as improved Windows integration. Even if a user actively enters the HTTP protocol when using a private window in Firefox, the connection to the requested domain will now default to HTTPS. If a user clicks on an HTTP link, an HTTPS-first request is also made.
HTTPS by default only provides access to the page itself, not all images, CSS, or JavaScript files loaded by the page, according to the browser maker. In most circumstances, however, loading a website over HTTPS will also force those in-page components to load over HTTPS, said Mozilla.
To Read More: ZDNet
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