How Do I Get Java Working On Firefox 16 With Windows 7 64-Bit
October 20, 2012
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This was driving me crazy. I upgraded to Firefox 16 (from 15) and all of a sudden Firefox wouldn’t run Java-based websites.
Mozilla explain that this is because the previous version of Java installed on my computer was deemed “insecure”.
So: here’s what to do.
Make sure all browsers on your desktop are closed.
Download and install Java 32-bit (even if you’re on a 64-bit Windows 7 machine) from the manual download page on www.java.com.
Start Firefox. Then select from the menu (you might have to press the Alt key to make the menu appear):
Tools -> Add-Ons (also ctrl-shift-A will do the same thing)
Next find the Java plug-in (not the Java Deployment Tool which is completely unrelated) from the list of plug-ins. It might be at the bottom of the list.
Press the Enable button. Yes: you have to tell Firefox that you want to run Java again because it (unhelpfully) disabled the plug-in!