After updating Firefox you may receive one (or more) messages stating that Java Console Is Incompatible With Firefox. This article applies equally to Firefox 7 and Firefox 8, even if you install the latest version of Java (currently v6 update 29). The reason is that Oracle have only certified Java Console for Firefox 5 and are not pushing Java updates quickly enough to keep up with the Firefox rapid release schedule.
Expect this issue to continue in future Firefox versions unless Oracle start updating Java more quickly… The error occurs when you update Firefox, after Firefox restarts you see the “Java Console Is Incompatible With Firefox” message.
Java Console is an add-on in Firefox installed by Oracle’s Java program (used by most people). If you have several old versions of Java installed on your computer then you will also have several versions of the Java Console add-on in Firefox – you will receive the ‘Java Console Is Incompatible With Firefox 6.0’ error message for each and every version of the Java Console add-on in Firefox.
Is There A New Version? No. Checking Firefox add-ons for updates will not find any newer version of Java Console that is compatible with Firefox 6.0
Does It Matter?
- No – unless you are a Java developer or have a specialized requirement you can safely ignore these incompatible Java Console add-ons errors. The Java Console is mostly a redundant add-on i.e. it is not needed for Java itself to work in Firefox.
- There is no performance loss in having these add-ons as disabled.
- You can test that Java still works properly in Firefox 6.0 by visiting Oracle’s Java test page here. If you have an old version it is worth updating it for general security and stability but it will not resolve the Console error message.
Warning: If you do have multiple versions of Java installed on your computer, this is a security risk as malware will use (attack) your oldest version of Java which will have security holes subsequently fixed by later versions.
You should uninstall all old versions of Java (via Add/Remove Programs or Program Features) and ensure that you have installed the latest version of Java for best security – Oracle’s Java test page (see link above) will tell you if you have the latest version or not.