The original source[0] contains the technical background anyone here is probably looking for. TL;DR: - Chrome needlessly revalidated all resources after a POS

The original source[0] contains the technical background anyone here is probably looking for. TL;DR: - Chrome needlessly revalidated all resources after a POST request - Firefox gets a "cache-control: immutable" header to indicate that a resource will never change and thus doesn't need to be revalidated. [0]: https://code.facebook.com/posts/557147474482256/this-browser-tweak-saved-60-of-requests-to-facebook/ https://code.facebook.com/posts/557147474482256/this-browser...