Maybe you could approach this from the other side,
ie. don't add the "unload" handler if bfcache is available.
You could probably use the pageshow or pagehide events to detect this.

-- Mark

2009/7/29 James Padolsey <jamespadol...@googlemail.com>:
>
> Around line ~3100 (3321 in the latest nightly) you're binding the
> unload event so as to prevent any memory leaks in our favourite
> browser (IE). Unfortunately the presence of an "unload" handler
> disables some caching techniques used in other browsers (see
> https://developer.mozilla.org/En/Using_Firefox_1.5_caching ...
> Specifically the "bfcache").
>
> I know you're no longer using browser detection so I was wondering, is
> there an easy and quick way to detect a browser that's going to leak
> memory? ... If so, you could conditionally add the "unload" handler,
> only for browsers that require it (IE)...
>
> If there's no way of testing it then why can't you just use some
> browser detection there? Is the cost of disabling the bfcache really
> worth the benefit of having no browser detection in the core?

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