We did not import commit
(“Add security enhancements suggested by Jesse Ruderman.”) into our
Iceweasel 24.5.0esr build since they hadn’t been tested much in the wild
at the time of building and so may introduce subtle regressions, which
would be a shame for the Tails 1.0 release. This should be re-evaluated
in time for Tails 1.1.
This change is already live in Tor Browser 3.6-beta-2, and will be in the stable 3.5.5 release AFAICT, so we should ask Mike Perry or the other TBB people how it all went.