JSWPS does not recognize max-age?

Hi Experts,
It seems SJWPS only works with HTTP Last-Modified but not Cache-Control max-age header. I've tested with HTML pages with
Cache-Control: max-age=300, s-maxage=300
but none of them gets cached.
Can any one confirm or clarify?
Thanks,
Brian

Someone mentioned that if FF gets a querystring it always goes for a unconditional request (even if the querystring was already requested earlier)
http://webmasters.stackexchange.com/questions/16011/why-doesnt-firefox-cache-my-images-and-css

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