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Make sure your Java (Not JavaScript) is up to date Verify Java and Find Out-of-Date Versions {web link}

Version 8 Update 65 Release date October 20, 2015

what is the error message please you are getting?

There are known issues with some Java applets in Firefox 42.

See this bug report:

• bug 1224549 - hang in Java plugin (npjp2.dll) with Firefox 42

Please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html

I read over the Bug report thanks for the Info. Is there any way of knowing if the issue will be fixed in the newest release of Firefox?

plugin-container.exe issue if i had to guess :/