I cannot open JAVA since updating Firefox

I used Java successfully for one web site until my last update with Firefox. Now Java will not open and a popup explains that the app I tried was not registered with Apple by an identified developer. Also it says the safest approach is to look for a new version of the app from Mac App Store or check for an alternative from an identified developer. It also says I can override my security settings and open the app anyway.
Since I used it for so long I don't understand this glitch or what is safe to do. I cannot find an app for JAVA for mac in the Mac App store.
Any one else have this problem? Any advice on what is safe to do? I haven't tried to open it within Safari because I didn't want to use Safari for Java.
Thanks.

DL = download
SE = standard edition
JRE = Java Runtime Environment component
The only way to tell which JRE version you have installed in Lion or larter is to run this commend in the Terminal app:
/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version
It should return something like this:
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

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