Mozilla has made a change in Firefox that will block all of the older versions of Java that contain a critical vulnerability that s being actively exploited. The decision is designed to protect users who may not be aware of the flaw and attacks. Java is one of the many browser components and extensions that users sometimes will fail to update for long periods of time. The specific vulnerability in Java that Mozilla is trying to. was patched by Oracle in February, but Java is. one of many browser. components that users. sometimes will not update for a long time before they remember to update.
Source: https://threatpost.com/mozilla-adds-older-java-versions-firefox-blocklist-040312/76394/