The Firefox 4 compatibility hotfix is now available.
This hotfix will address issues seen between Firefox 4 and the Norton Toolbar in NIS 18.5 and Norton 360 v5. Be sure to upgrade to Firefox 4 before installing the hotfix.
You can download the hotfix here:
Currently, this fix is only available by downloading and installing the file on the above site. The fix will be included in the next major product update via LiveUpdate, but it is NOT CURRENTLY available through LiveUpdate.
Also of note: This hotfix will NOT address compatibility issues with Firefox 4 and the Norton Toolbar on the Comcast Norton Security Suite.
UPDATE: Click here for the latest announcement on the Firefox 4.0.1 compatibility issue.