Is Firefox 6/7 handling max-width:320px media query wrong?

Question

I\'m seeing strange behavior with media query in Firefox lately, and I was wondering who\'s doing it right (compared to Chrome and IE9).

I\'ve got the following css:

Answer 1

I dont know why the answer provided has been ticked as it doesn't answer the OP's question. The reason why the media query doesn't fire 320 pixels is because of the navigation toolbar in Firefox.

If you turn it off (go to VIEW - TOOLBARS - NAVIGATION TOOLBAR and untick it) then the media query will fire at 320 pixels.