If you really need an older Java plugin to work, there's a workaround (Mozilla) Mozilla has provided an update on the Java blocklist that rolled out a couple of days ago. Mozilla wanted to softblock ...
Mozilla on Friday announced it has added Java 7 Update 9, Java 7 Update 10, Java 6 Update 37, and Java 6 Update 38 to its Firefox add-on block list, following yesterday’s news of a new vulnerability.