problem with firefox dns look up time

[kminooie]

Hi, I can't explain the difference between the time it takes for firefox to lookup subdomains and the other browsers. for example, these two tests were run roughly at the same time:

chrome: http://www.webpagetest.org/result/150415...1/details/

firefox: http://www.webpagetest.org/result/150415...1/details/

can anyone help me understand why this is happening?

btw, I am using dns-prefetch for both of those subdomains. thnaks