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Here's a more indepth technical article from Facebook: https://code.facebook.com/posts/557147474482256/this-browser-tweak-saved-60-of-requests-to-facebook/ http

• ctrl_freak 10y ago
  The original post should be updated to point to this link. Interesting read. Also seems like a subtle jab at Microsoft and Apple when they said, "We're happy to have such a good working relationship with our friends on the Chrome and Firefox teams." Conditional requests were actually higher on IE and Safari than Firefox, so chances are they tried to engage with those teams but were shut down?