It seems to be a day for browser updates. The Mozilla organization has released a new version of Firefox, 3.6.9, for Linux, Mac OS X, and Windows. The new version introduces a new capability that Webmasters can use to help prevent “clickjacking” attacks, with support for the
X-FRAME-OPTIONS HTTP response header. It also includes stability fixes, and patches 14 security vulnerabilities, including several rated Critical. Further details are given in the Release Notes.
Because of the security updates, I recommend updating to the new version. You can use the built-in update mechanism (Main menu: Help / Check for Updates), or you can download installation binaries for all platforms in many different (human) languages here.
Update Wednesday, 8 September, 21:03 EDT
If you are still using the 3.5.x version of Firefox, and don’t want to move to 3.6.x right now, Mozilla also released a new version 3.5.12, which incorporates the security fixes. Further information is in the Release Notes (3.5.12); download links are here.
Update, Thursday, 9 September, 11:11 EDT
I should have mentioned that one of the vulnerabilities fixed in this release is the “DLL Hijacking” vulnerability in Windows that I mentioned at the end of August.