The java console extension is not part of Firefox nor is it provided by Mozilla. Please report this bug to the extension's author.
I have this same problem I think. I got the automatic update on Firefox to 188.8.131.52 maybe last week??? and now this one website will not load the game I love........scrabulous.com. And it was working fine before the update. I tried to uninstall JAVA on my computer and reinstall and it was no help. I run the Java test on IE and it says all is up to date on my Computer that I do not need to download anything after I re downloaded it. I have run the "Test your Java Virtual Machine (JVM)" on IE and it works fine and run the SAME test on Firefox and the little dancing man with the red circle in the middle does NOT show up. So it does NOT work. I have tried the enable/disable Java and this does not help. I have added the patch for "java console" because the original "java console" would just disappear when you clicked on it. I obviously am not a computer guru but to me the new Firefox update is to blame and somehow it needs to be fixed and I certainly cannot do it. Please let me know when there is a fix. Until then I have to go back to IE. Scrabulous works just fine there!!!!!!!!!!