back button is out of scope of RichFaces ajax framework. check for some thirdparties which takes care of it within ajax requests.
And in firefox I had no problem, the navigation rule was working and I was going to the detail page.
ah.. navigation :) a4j:controls should not be used for navigation except navigation inside a4j:include or redirect based navigation rules. It never worked in IE. Actually there is an issue on that but it still not planned. And actually was just not designed from the beggining. Because controls designed for partial updates within the page seems not a good solution for navigation.