Firefox recently got updated to version 6.0.2 and as usual after updating, Firefox automatically checks for any outdated incompatible extensions or add-ons. I have the Add-on Compatibility Reporter plugin installed which forces Firefox to continue using any incompatible extensions, if not, the incompatible extensions will be automatically disabled. I normally ignore the Extensions tab since I never had any incompatible problems, then one day I noticed that there are 4 Java Console listed in the extensions. I guess Java doesn’t do a good job in removing old Java files after installing an update.

Java Console extension is actually quite useless for normal users as it is mostly used by developers. As long as your Firefox browser has Java listed in the “Plugins” tab, then you won’t have problem opening websites that requires Java. Theoretically less is better because logically running less stuff takes up less resources. If it doesn’t make much different, at least the Extensions tab looks neater. Weirdly there are no Remove button for you to easily remove the Java Console extension. Here is how to manually clean up the old Java Console from Firefox web browser.


First you need to locate where Firefox is installed to and by default it should be in C:\Program Files\Mozilla Firefox\ or C:\Program Files (x86)\Mozilla Firefox\ for 64 bit Windows systems. If it’s not there, simply right click on the Mozilla Firefox shortcut icon and select Properties. Click on the Open File Location button to automatically open the Firefox location in Explorer. Access the Extensions folder and you should see a couple of long folders names with random letters and numbers.

There are two ways to determine if the folders belong to the Java Console:

1. Edit either chrome.manifest or install.rdf with a text editor such as Notepad. If you see Java Console in there, then that folder belongs to Java Console.

2. Access the inner folders until you find ffjcext folder or file. I believe ffjcext is short for Firefox Java Console Extension.

Before removing or deleting the folders, make sure you exit Firefox first. Once you have removed the folders from the Extensions folder, run Firefox and you will no longer see Java Console listed in the Extensions tab.