More than a week after the release , but a new version of Mozilla Firefox cannot be reported. The best way to update is provided by the built-in update system (Help -> Check for updates), if suddenly it has not worked yet or you need installation files, you can always download them:
At the same time, version 1.5.0.11 appeared. By the intentions of the developers, further support for the 1.5 branch is terminated. - Firefox Setup 1.5.0.11.exe (4.92Mb, English version) - Firefox Setup 1.5.0.11.exe (4.94Mb, Russian version) ')
One of the main reasons for the new version was the elimination of a potential vulnerability that allowed attackers to scan open ports due to the peculiarities of Mozilla Firefox in PASV mode when connecting via FTP.