Java applets not working in Mozilla Firefox 3.6.14
If you want to migrate to > Mozilla Firefox 3.6.14, please consider that Java applets are not working in this version.
Mozilla are aware of the issue involving Java applets not working in Firefox 3.6.14 and are working on a fix, no timescale but they are planning on a quick release. They are currently creating Firefox 3.6.15 which should fix this and will then be testing it to ensure the fix is working. (Source: > http://bit.ly/hi2UoT)
See the > Mozilla support page for more information.