Because the rest of the commentors in this thread seem to not be reading the article, there's a performance issue in Firefox due to the following unresolved bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1190398
Chrome seems to be doing some things right and Firefox is just adrift...
I think some selective derision is warranted.
We saw so many (warranted or unwarranted) "Best viewed with Chrome"-statements on the web already that we became desensitized to it years ago.