I got similar problem . . . after activating QtCurve as KDE sytle. Changing the style to anything else resolve the problem (firefox works again, no stack smashing).
So I think firefox has no problem, the problem comes from QtCurve! -- *** stack smashing detected ***: /usr/lib/firefox/firefox-bin terminated https://launchpad.net/bugs/65740 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs