I am not able to see the Firebug addon on my FireFox 6402 Version

Firebug plugin is no longer supported in the latest version of firefox. Please downgrade your firefox version to 37 till 40 to work on the firebug plugin.

For more information, please watch Module-10

Actually i have downgrade it but it shows Cisco webex extension is incompatible with firefox 40.0, please give me some solution to add the firebug and firepath add

If we try to downgrade to lower version below 40.0 then webex is not working i mean not compatible. So this is the problem i faced. So which way should i follow to install firebug with webex also working for me please guide....!

You can try downloading webex extension in chrome browser.

Ok thanks got it