Firefox 1.0.3 was just released. This is a slightly bigger deal than previous releases, because it can break a few extensions due to an important security fix.
The Mozilla Foundation contacted the authors of extensions with problems so they were fixed ahead of time, but it's still possible a few won't work.
Asa has been blogging about extensions issues and 1.0.3 - this post is particularly relevant.
Please keep all Firefox 1.0.3 extension issues in this thread.
edit: Here is the updated list of known vulnerabilities.
The Mozilla Foundation contacted the authors of extensions with problems so they were fixed ahead of time, but it's still possible a few won't work.
Asa has been blogging about extensions issues and 1.0.3 - this post is particularly relevant.
Please keep all Firefox 1.0.3 extension issues in this thread.
edit: Here is the updated list of known vulnerabilities.