The remote browser may allow an attacker to read confidential data.
The installed version of Firefox is reported to be vulnerable to a number of flaws. The details of the flaws are not currently known; however, it is alleged that an attacker can bypass security mechanisms in order to obtain local file contents. In order for this attack to be a success, the attacker would need to be able to convince a user to browsea malicious URI and expect that the user would allow a popup window.
Upgrade or patch according to vendor recommendations.