Yesterday, Mozilla announced that it would delay today's planned launch of Firefox 11 for a few days in order to scrutinize a potential security issue and to avoid issues with Microsoft's Patch Tuesday updates today.
Now, however, Mozilla has canceled this delay and announced that Firefox 11 is still on track for today's release. The security vulnerability, it turns out, was already known and patched. In order to avoid the conflict with Patch Tuesday, though, this release will only be available as a manual update today. Once the Firefox team is sure that there are no issues with Microsoft's latest patches, it will push automatic updates to all users.
Since switching to its rapid-release schedule, Mozilla never missed a scheduled release date for Firefox.
What's New in Firefox 11
Once Firefox 11 is available, this is what you can expect from the update: