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On a Mac Java applets not working on FF 31, have not worked since FF26; how to fix?

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KeepVid, Quietube, Pin It, and placeholders on most websites instead of Java applets. Running Mavericks and Mountain Lion on an iMac and MacAir, and the applets don't work on either - they haven't worked since FF26. Plug-in is installed, and "always activate" in on. Anyone know what's going on and how to fix this?

KeepVid, Quietube, Pin It, and placeholders on most websites instead of Java applets. Running Mavericks and Mountain Lion on an iMac and MacAir, and the applets don't work on either - they haven't worked since FF26. Plug-in is installed, and "always activate" in on. Anyone know what's going on and how to fix this?

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I know of two settings associated with Java, maybe we can start there? About:addons and then go to "extensions". Look for the Java plugin and make sure it is activated.

After this you can go to the Java options to make sure that it is active and check if it is up to date here https://www.mozilla.org/en-US/plugincheck/

How to allow Java on Trusted Sites in Firefox may also be helpful.