The security fixes in Version 27.0 include four (4) critical, four (4) high, four (4) moderate and one (1) low security update.
To get the update now, select "Help" from the Firefox menu at the upper left of the browser window, then pick "About Firefox." Mac users need to select "About Firefox" from the Firefox menu.
Additional information about the update is available in my blog post here (http://securitygarden.blogspot.com/2014/02/mozilla-firefox-version-270-released.html).
via ky331 at FF 27 + Sandboxie + XP3 conflict (http://en.community.dell.com/support-forums/virus-spyware/f/3522/t/19543734.aspx):
QuoteThere are confirmed reports coming in --- myself included --- of FF 27 *NOT* running in Sandboxie (4.08) under Windows XP SP3.
There is also an UNconfirmed report that this also happens under Vista.
(However FF 27 still works in Sanboxie under Win 7 SP1).
http://www.sandboxie.com/phpbb/viewtopic.php?t=18072
Firefox 27.0.1 (released 2/13/14)
What's New:
FIXED
27.0.1 - Fixed stability issues with Greasemonkey and other JS that used ClearTimeoutOrInterval
FIXED
27.0.1 - JS math correctness issue (bug 941381)
===============================
Remark: I don't believe this (minor) update has any impact on the Sandboxie conflict...
I'm hoping it solves the problem I've had with it hanging.
The thread in the Sandboxie forum is now on page 9, with minimal official input from the Sandboxie people, and absolutely no input from the FF staff. And while many have offered strong opinions, there is no definitive conclusion as to what the problem is, nor which program needs to be fixed.
Here is what I believe to be the latest accurate information:
1) FF 27 made a change. Period. All other factors remained the same (with the exception of a new Flash Player, which I quickly/carefully ruled-out as being the culprit).
2) The FF 27 change does not directly cripple its functioning in Sandboxie, which is why many users are not impacted by the problem. However,
3) In the presence of an appropriate third-party program which acts as a "catalyst", the FF+Sandboxie conflict will manifest itself. [Think of the FF change as somehow "bouncing off" the catalyst, to then "strike at" Sandboxie. All 3 factors are required here to generate the conflict: having only two of the three results in an ordinary interaction between those two.]
4) In contrast to my initial report, XP is NOT a factor in this conflict... it can happen on any operating system, and is neither caused nor "enhanced" by running XP.
As for the "catalyst" 3rd-party program, it is highly probable (i.e., almost guaranteed) that one such catalyst is avast 2014 (aka avast 9). However, it is not the only catalyst (as a few NON-avast users are experiencing the conflict).
We also note that avast 8 is NOT a catalyst.
Until an official fix is released, the conflict can be easily mitigated via a simple work-around: Setting FF's compatibility tab to "Disable Visual Themes".