Seems to be fixed by this commit https://hg.mozilla.org/releases/mozilla-release/rev/8a2adb09dd1028af83524adea36c5b2797a1c1bd https://hg.mozilla.org/releases/m

Seems to be fixed by this commit https://hg.mozilla.org/releases/mozilla-release/rev/8a2adb09dd1028af83524adea36c5b2797a1c1bd https://hg.mozilla.org/releases/mozilla-release/rev/8a2adb09... Date introduced seems Thu, 02 Feb 2012 13:41:58 +0100 (2012-02-02) but I may be wrong