How can I make Firefox use another version of the installed Java runtime?

For purposes of development, I have several versions of the Java runtime on my 64 bit Windows 7 computer. I try to keep the number of JDK and JRE installation to a minimum and I want Firefox to use JRE 1.7.0_21 (32 bit) because this happened with a version of JDK, I am forced to use another application.

Firefox however use JRE 1.6.0_31 and is correctly reported as non-secure. It offers me the upgrade option, but I don't want to download and install a different JRE since I already said 1.7.0_21 installed JRE. I would prefer very just to be able to point Firefox so that JRE. I don't see an option to select a different JRE installed however.

I tried to manually edit the file pluginreg.dat (I know, it says do not edit...) by changing the entries of JRE 1.6 and 1.7 of the JRE, but on reboot, my changes have been overwritten and was back at the old JRE. So I can't view some web sites (also company/internal) without having to change to any browsers.

Please let me know how I can make Firefox use the already installed JRE 1.7.

Firefox scans the registry to find the location of the plugins.
If Firefox detects a plugin and not the other, then that means that the other Java plugin is not having a corresponding registry key.

64-bit Windows:
HKLM\Software\Wow6432Node\MozillaPlugins\@Java.com/JavaPlugin,version=XX.XX.XX
32-bit Windows:
HKLM\Software\MozillaPlugins\@Java.com/JavaPlugin,version=XX.XX.XX

Tags: Firefox

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