The developers of the Mozilla Foundation yesterday published a security
bulletin , from which it follows that a problem was discovered in Firefox 16, which became available on
Tuesday , using which you can get a list of visited sites. At this time, the download link from the Firefox site has been removed.
Vulnerability does not affect younger versions of the browser. The developers of the fund are already working on a fix - the release of the updated version of Firefox is expected within two days. For those who managed to upgrade to the vulnerable version, it is proposed to roll back to version
15.0.1 .
Firefox 16 is still available on
Mozilla Russia (14.00 Moscow time). Cases of exploitation of vulnerability are not yet known.
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UPD: The updated version of Mozilla 16.0.1 can be found
here . And the concept of an
attack that could be carried out on Firefox is shown in the screenshot:

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Source ]