Ubuntu 8.04 has Firefox 3 as the default browser.
On July 16, 2008 Mozilla released Firefox 3.0.1 that fixes a lot of critical
security flaws.
But at current date, there're no updates for Firefox 3 for Ubuntu 8.04.
'Check for updates' button is also disabled in Firefox. Still no updates for
Firefox 3 in Ubuntu Update Manager.
Ubuntu security sucks!