they are not
20 years ago programmers had to write VERY efficient code that worked. Today, they just need to write code that does the job and its not awfully slow, they can add features as long as the overall program is still usable.
2 publicly visible posts • joined 19 Feb 2008
Mozilla knew about the vulnerability for weeks.
It was just one day before releasing the patch that they informed Opera about it.
https://bugzilla.mozilla.org/show_bug.cgi?id=408034
The original bug submission, reported: 2007-12-11 23:06
http://www.mozilla.org/security/announce/2008/mfsa2008-02.html
Mozilla Foundation Security Advisory 2008-02, announced: February 7, 2008