What was the major change in Firefox v.3.6 15 which was released shortly after 14?

Firefox 3.6.15 fixes n issue where some Java applets would fail to load in Firefox 3.6.14 What’s New in Firefox 3.6.15 Firefox 3.6.15 fixes the following issues found in previous versions of Firefox 3.6: Fixed an issue where some Java applets would fail to load in Firefox 3.6.14 You may also be interested in the Firefox 3.6.14 release notes for a list of changes in the previous version. System Requirements Before installing, make sure your computer meets the system requirements. Downloading Mozilla provides Firefox 3.6 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest version of Firefox 3.6 here. For builds for other systems and languages not provided by Mozilla, see the Contributed Builds section at the end of this document. Installing Please note that installing Firefox 3.6 will overwrite your existing installation of Firefox. You won’t lose any of your bookmarks or browsing history, but some of your extensions and other add-ons might not work until updates for them are made available. You can reinstall an older version later if you wish to downgrade. Uninstalling You can remove Firefox 3.6 through the Control Panel in the Start Menu on Windows, by removing the Firefox application on OS X, or by removing the firefox folder on Linux. By default, removing Firefox 3.6 won’t remove your bookmarks, web browsing history, extensions or other add-ons. This data is stored in your profile folder, which can be found by going to the Help menu and selecting Troubleshooting Information.... The button next to the Profile Directory line in Application Basics will open your profile directory in your system's file explorer. Please note that if you keep your profile, any version of Firefox that you install after removing Firefox 3.6 will continue to use the bookmarks, web browsing history, add-ons, and other data from this profile folder. Extensions and Themes Extensions installed under Firefox 3.5 may be incompatible and/or require updates to work with Firefox 3.6. Please report any issues to the maintainer of the extension. When you install Firefox 3.6 all of your Extensions and Themes will be disabled until Firefox 3.6 determines that either a) they are compatible with the Firefox 3.5 release or b) there are newer versions available that are compatible. Known Issues This list covers some of the known problems with Firefox 3.6, which will be resolved in future releases: All Systems If FIPS mode is enabled and certain files have been removed from the system, the browser may crash on startup (see bug 522041) Microsoft Windows Content over certain Flash videos may not disappear when the video plays (see bug 571313) Older Flash videos on http://Download.com may fail to play. CNet has been notified of the issue (see bug 569104) Some slower machines may see degraded mouse responsiveness when viewing certain Flash videos (see bug 561818) Linux and Unix Firefox may have difficulty playing system sounds in some distributions of Linux (see bug 536996) Zooming out on some sites may result in grey or black lines appearing (see bug 468496) Source: http://www.mozilla.com/en-US/firefox/3.6.15/releasenotes/