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How do I enable a Java plug-in via script that was just added to the blocklist?

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I need to enable Java 6u29 that was just added to the blocklist via script because there are several thousand end-nodes involved. Also, I am constrained to Firefox 3.6 due application compatibility issues.

I need to enable Java 6u29 that was just added to the blocklist via script because there are several thousand end-nodes involved. Also, I am constrained to Firefox 3.6 due application compatibility issues.

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The script has added Java 6u29 to the fx 3.6 blocklist on several thousand end-nodes and you need to revert the action/unblock Java? Have I understood it correctly?

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Probably the only or easiest way to remove or disable the blocklist of older Java versions would be to disable blocklisting by locking the extensions.blocklist.enabled to false via a mozilla.cfg file.
You are already running a no longer supported Firefox 3.6.x version that won't receive updates.

You can use a mozilla.cfg file in the Firefox program folder to lock prefs or specify new (default) values.

Place a file local-settings.js in the defaults\pref folder where you also find the file channel-prefs.js to specify using mozilla.cfg.

pref("general.config.filename", "mozilla.cfg");
pref("general.config.obscure_value", 0); // use this to disable the byte-shift

See:

You can use these functions in mozilla.cfg:

defaultPref();  // set new default value
pref();         // set pref, but allow changes in current session
lockPref();     // lock pref, disallow changes

lockPref("extensions.blocklist.enabled", false);