Here's Mozilla's linked post on this, from March of this year - http://blog.mozi... | Hacker News

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		JacobAldridge on Dec 2, 2010 \| parent \| context \| favorite \| on: History Sniffing: How YouPorn Checks What Other Po... Here's Mozilla's linked post on this, from March of this year - http://blog.mozilla.com/security/2010/03/31/plugging-the-css... To support your statement, I haven't found anything saying this has been removed.

fhars on Dec 2, 2010 [–]

There seems to be a partial fix in the 4.0 codebase: https://bugzilla.mozilla.org/show_bug.cgi?id=147777#c259

sid0 on Dec 2, 2010 | [–]

Yeah, sites like http://www.didyouwatchporn.com/ and http://ha.ckers.org/weird/CSS-history-hack.html fail to work in Firefox 4. The followup bugs are more to do with tuning what is allowed and what isn't, e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=559722.

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