It's weekend, but Mozilla still released a second release candidate of their upcoming Firefox 4 web browser.

• Blacklisted a few invalid HTTPS certificates
• Updated localizations for 29 locales
• Added Vietnamese localization, bringing the total languages available in Firefox 4 to 83

With Microsoft releasing their Internet Explorer 9 only days ago, it's nice to see the second most popular web browser to do the same, so you can stack them up nicely against each other.

You can download and test drive this almost golden release from the Mozilla web site. Firefox 4 final is expected to arrive on March 22.