I don't think the volunteers here can support Firefox 3.6.9 any more. Why do you need to run such an old version? (Of course, you know it has many unpatched security vulnerabilities.)

Please update to Firefox 25.0.1.

Note that if you must use Firefox 3.6 the last security update was 3.6.28 (3.6.twenty-eight).

Is there a particular reason why you are trying to use Firefox 3.6 ?

We are using 3.6.9 because of, we have one web based application, which support only Firefox 3.6.9, so we cant upgrade or change to any version, please let me know if it support or not

We cant upgrade