Mozilla has released the next update for Firefox with Firefox 20. New in this release include:

• Per-window Private Browsing.
• New download experience.
• Ability to close hanging plugins, without the browser hanging.

See the Release Notes for more details and complete list of changes.

Also released was an update for Firefox 17esr (Firefox for Organization) with 17.0.5esr. The Firefox esr update only contains bug fixes and security/stability updates.

Depending on the operating system and update settings (Tools > Options… > Advanced > Update Tab), users will be prompted to update within in the next 48-hours. Windows users can also go to Help > About Firefox and click the Check for Updates button. Users may also manually download and install Firefox via getfirefox.com. The next scheduled releases will be Firefox 21.0 and 17.0.6esr on May 14th, 2013.