Perhaps because one user posted his/her site link there which may trigger something. I dont get it on FF3 though.

For those who can view that page, here is the most important news on the particular page

Version 3.6.6 is released, this version is a "maintenance" version, which contains minor bug fixes and no new feature. While it is recommended to upgrade, it is not critical.

Bug fixed: cache folder(s) permission: there is a bug in the cache class that causes the new cache folders to be created with insufficient permission (644 for example) on some servers.

After upgrading the new version, please go to admin->extra->ssu manager and run "Check and fix cache", depending on the number of cache files and folders on your site it may take several minutes. If the operation times out, just run it again, it will pick up where it left off.

Benefit of upgrading to this version: if this bug affects your server, it will prevent SSU from utilizing caching properly, and thus may cause SSU to run more sql queries that it should (since it can't read from cached files). This fix will help with that.