Mozilla Corp. yesterday extended support for its 17-month-old Firefox 1.5.0.x
browser until mid-May, citing the need to roll out a patch that will
automatically update users to the newer 2.0 version before it pulls the
support plug.

Even that date looks iffy, however, according to information posted to Mozilla development wikis.

The company had earlier said that yesterday would be the
termination date for Firefox 1.5.x support — meaning it would issue no
new security updates after that. But when it released version 1.5.11 last month, Mozilla hinted that the final security fix would not make that deadline.