In this case, Firefox 3.6.10 fixes a single highly critical stability issue in Firefox 3.6.9 that is causing crashes for a group of Firefox users.

Users who want to read up on the issue can visit the Bugzilla listing for a list of bugs fixed in Firefox 3.6.10, or the actual bug listing of the bug that caused the stability issues.

Firefox 3.6.9 users should receive automatic update notifications in the browser already, another indication that the fix is critical and needs to get out as soon as possible.

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Firefox users who have not updated the browser yet can download the latest version from the official Firefox download page over at the Mozilla website.

A quick second release usually indicates a severe problem that needs to be addresses asap, often stability or security related.

The Mozilla Developer Center blog offers an explanation. Firefox 3.6.8 fixes a single “stability problem that affected some pages with embedded plugins”.

Users who have not received the update notification yet, can download the latest version of Firefox directly from the Mozilla website instead.

This downloaded version then needs to be installed after the download to the local hard drive has finished.

The Firefox 3.6.8 update is offered for all supported operating systems and languages.

In the blog posting Mozilla “strongly encourages” users of Firefox 3 and Firefox 3.5 to upgrade to the latest Firefox 3.6 branch.

The new version of the web browser is currently distributed to worldwide mirror servers, and will be announced officially once the distribution completes.

As of now, it is only available directly on the Mozilla ftp site. The release notes are still mentioning Firefox 3.6.7 Beta and not the final release, it is expected that they are updated to reflect the final release.

Bugzilla lists a total of 76 bugs that have been fixed in the new version of the web browser, among them ten critical issues, and seven major issues.

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Specifically Windows 7 users will see several improvements, a memory leak issue has been fixed as well as two Windows 7 taskbar related issues.

Official downloads will be made available on the release notes page later on. Users who do not want to wait this long can check the ftp server to find the release for their operating system and language.

This could very well be a response to user complaints who noticed slow downs and cpu spikes after upgrading or installing Firefox 3.6.4.

The Mozilla Blog has additional details about the upgrade.

Following the release of Firefox 3.6.4 we heard from some users, mainly those using older computers, that they sometimes expect longer periods of non-responsiveness from plugins, especially with games. For these users the default timeout of 10 seconds was too short. To address this, we increased the amount of time Firefox waits for a plugin to respond before terminating it from 10 to 45 seconds. This change has been made in Firefox 3.6.6, which was released today as an automatic update for all users.

Firefox 3.6.6 is not yet available via the automatic update check in the web browser itself. A download is provided over at the Mozilla website.

Firefox users can download the latest version for their operating system and language. It is likely that the new version will be picked up by the internal update checker later today.

I have been a beta user ever since the first version of Firefox 3.6.4 came out. The latest build is a security and stability update which makes it a recommended update for everyone who is already working with Firefox 3.6.4.

The only viable source of information at this point is the Bugzilla bug listing as the release notes do not list changes in beta and alpha builds separately.

Bugzilla lists many critical crash bugs mostly related to plugins. Seems that the developers are still working on the out of process plugin capability which is likely to be responsible for the crashes.

Firefox 3.6.4 users should receive an update notification directly in their web browser. The new build of Firefox is also available on the developer’s site for all operating systems and languages.

Users who are running a beta or developer version of Firefox 3.6.4 can go to Help > Check for Updates to display the information about the update with options to download and install it right away.

Firefox 3.6.x users who want to update to Firefox 3.6.4 right away because of the security and stability improvements need to install the beta version first and then perform the update check.

The beta version is available on the Firefox beta page.

The full list of bugs that are fixed can be viewed at Bugzilla. The bugs included two rated as blocker, 19 as critical and eight major ones. The total amount of bugs fixed in Firefox 3.6.4 is 189 across all supported operating systems.

Other notable changes to the new version of the web browser include several bug fixes. A full list of all bugs that have been fixed in Firefox 3.0.7 is accessible here.

The release has not been announced officially yet although it is available directly on several ftp mirrors already. There is a slight chance that changes will be made to this release before it is announced which would mean that early downloaders would have to download the new version as well. It is however unlikely that this is going to happen and you will be informed here if it is.

Users who want to update Firefox to the latest version right away can access the official list of mirror sites. Some are already listing the Firefox 3.0.7 release while others have not been updated yet.