That's interesting. I don't really support Firefox yet. I didn't know Firefox prompted users before allowing html5 offline storage. The webkit browsers don't ha

That's interesting. I don't really support Firefox yet. I didn't know Firefox prompted users before allowing html5 offline storage. The webkit browsers don't have this behavior. I use offline storage to sync books and make them available to read offline. You are right that the back button behavior is a little weird. I completely missed this during my tests. Shame on me. The use of the history API was meant to allow people to bookmark places within books not to make "back" act all weird. I will have to reconsider how I do this. Thanks for the feedback :-)