Here are details of security vulnerabilities fixed in this version
But it does include a new updater which will only cause a UAC popup once after which users who have User Account Control enabled in Vista or Windows 7 won't see it again.
EDIT: The "New Tab" page is present, but disabled. To enable it, do the following:
- In the location bar where you normally type in a web address (URL), type about:config and hit Enter.
- If you see a warning message, click "Yes, I promise I'll be careful" to proceed further, otherwise continue as follows.
- In the filter at the top, copy/paste the following: browser.newtabpage.enabled
- Double click the value to change it from "false" to "true" (it will change to bold type if you did it correctly).
- Close about:config and then open a new tab (CTRL+T, or click the tab "+" sign).
- In the location bar, type: about:newtab and hit Enter. Firefox should now display the most recently visited tabs.
Also, more on the auto-updater in this new version: http://support.mozilla.org/en-US/kb/what-mozilla-maintenance-service It can be disabled via Options | Advanced | Update (tab).
EDIT #2 The "New Tab" feature doesn't look like it's meant to if you enable it via the about:config menu as described above. To get a preview of what it will look like when finally released, check out the images on the Mozilla blog here: http://blog.mozilla.org/futurereleases/
Edited by Xircal, 25 April 2012 - 08:35 AM.