You should not be running old versions of Firefox, they are unsupported and insecure. Is there a reason you are trying to run an old version?

hello Rupesh1014,

Please open up Firefox and type in "about:config" in your URL/Awesome bar. Click the "I'll be careful,I promise" button. Now on the search field type in the below mentioned terms one by one and make sure they have the values set to "false" if not please double click on it which should toggle it to "false".

1. app.update.auto - false
2. app.update.enabled - false
3. app.update.silent - false

Hope that helps,keep us updated.