Mozilla have released Firefox 3.6.11 fixing nine security issues, five of which are rated as critical. A further two are rated as high severity, with one moderate and one low. More details can be seen in the latest security advisories.

The release also includes a handful of bug fixes, increasing the browsers stability. A full list of changes can be read in the release notes.

Firefox 3.5.14 was also released fixing several of the same security flaws.

Current Firefox users will receive the update over the coming days, or alternatively can download the latest version of the browser from the Firefox website.

Mozilla has a new CEO, Gary Kovacs, who has worked for Adobe, Sybase, and Macromedia in the past.

Kovacs has plenty of experience, and will be a fresh face for Mozilla in the future.

Kovacs appointment comes as John Lilly steps down officially on November 5th, after a six month hunt.

The Mozilla Blog has posted a short video introducing Kovacs.

Along with Firefox 4 Beta 6, Mozilla also released Firefox 3.6.10 to the public.

The release fixes a single stability bug, which caused some users to crash. More details can be read in the release notes.

The update is available for Windows, Mac and Linux users, and Firefox 3.6.x users should receive the update in the coming days.

Firefox 3.5.13 was also released fixing the same bug.

Mozilla have just released Firefox 4 Beta 6, fixing only a handful of bugs that made the previous release unusable for some.

As a result, there are no new features in Beta 6. Fixed in this release is a rendering issue affecting Mac OS X users, and a stability issue causing crashes in Windows. More details on the update can be found in the release notes.

Firefox 4 Beta 6 is available in 39 languages, and can be downloaded from the Firefox Beta website.

Firefox 4 is a step closer to completion with the release of Beta 5.

The latest release is available in 39 languages, and now has support for the HSTS security protocol.

Windows users have hardware acceleration turned on by default, with a new Firefox menu also making it’s appearance for Vista and 7 users.

A more detailed list of changes can be read in the release notes. Current beta users will be prompted to update in the coming days, while new testers can download the beta from the Firefox Beta website.

Mozilla are still hard at work, today releasing Firefox 4 Beta 4 tot the public which is packed with several new features.

New in the latest release is Firefox Panorama, which lets you arrange and organise your tabs at the click of a mouse button.

Also new in this release is the inclusion of Firefox Sync, which syncs bookmarks, tabs, history and passwords between different computers you use. Previously this has been available as an add-on for Firefox, but as of now it is included directly with the browser.

Firefox 4 Beta 4 is available for Windows, Mac and Linux users right now. A full list of changes can be read in the release notes.

Mozilla is still busy at work, today releasing Firefox 4 Beta 3 to the public.

Beta 3 is now available in over 30 languages, 10 more than the previous beta. Also new in this release is multi-touch support for Windows 7 and new JavaScript values to experience faster and smoother graphics.

A full list of changes can be read in the release notes, and current Firefox 4 Beta testers will automatically receive the update in the coming days.

Firefox 4 Beta 3 can be downloaded from the Mozilla Firefox Beta website.

Following the footsteps of Chrome, Mozilla’s Firefox browser is set to get silent updates by default in Firefox 4 on Windows.

“For Firefox 4 minor updates will occur automatically.  Users can change the setting in Options > Advanced > Update.  We’ll only be using the major update dialog box for changes like 4 to 4.5 or 5” wrote Mozilla’s Alex Faaborg.

The implementation will be slightly different to Chromes, with users still seeing the updating progress bar on load, but this is an implementation issue, which will hopefully be addressed in the future.

The aim of this of course is to keep users safe, and take away the hassle of users having to install security updates when prompted.

Auto-updates are expected to appear in Firefox 4 before it is final release to the public later this year.

Mozilla has released Beta 2 of Firefox 4, which is now available in 24 languages.

The update includes many changes, including apps tab feature.

“There are some websites you visit many times throughout your day, such as your email, social networks, music or game sites. Now you can turn the websites you use most into App Tabs to easily find the ones you need” said a release from Mozilla.

Mac users now receive the new interface that was delivered to Windows users in Beta 1, and puts tabs on top by default.

There is also more support for CSS3 transitions, retained layers allowing for faster scrolling on complex websites, and changes to the XPCOM framework reducing the browser start up time.

A full list of changes can be read in the release notes. Firefox 4 Beta 2 can be downloaded from the Firefox Beta website.

Future versions of Firefox are to get a new tab organisation feature called Tab Candy. The feature, which resembles exposé from Mac OS X, allows users to easily group and organise tabs into groups.

“With one keystroke Tab Candy shows an overview of all tabs to allow you to quickly locate and switch between them. Tab Candy also lets you group tabs to organize your work flow. You can create a group for your vacation, work, recipes, games and social sites, however it makes sense to you to group tabs. When you switch to a grouped tab only the relevant tabs are shown in the tab bar, which helps you focus on what you want” wrote Mozilla’s Aza Raskin.

Available as an alpha build, Tab Candy is written solely with HTML, CSS and JavaScript, meaning there is no native code for any platform.

More details on the project can be found in the Mozilla Wiki, while an alpha preview can be downloaded form the Mozilla FTP.