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Firefox becomes latest browser to support Fetch Metadata request headers.

July 13, 2021

Mozilla has announced that Firefox now supports Fetch Metadata request headers, further safeguarding users from a variety of highimpact online assaults.

Firefox 90 will have four new headers – Dest, Mode, Site, and User – that will allow web apps to protect users against numerous crossorigin threats such as crosssite request forgery (CSRF), crosssite leaks (XSLeaks), and Spectrestyle sidechannel attacks.