a great plugin for bsnl ,BSNL did some upgaradation in my area for IP TV etc and the plugin no longer works.
For viewing data usage i have to logon to http://data.bsnl.in now. If the exchange in your area was upgraded too, this wont work anymore.
IF that is not your case, go directly to http://thegoan.com/datafox/ and try installing it.
Goto TOOLS > OPTIONS > SECURITY and “Warn me when sites try to install addons” and add thegoan.com to the exception list too. Maybe thatz your problem ..
but its not instalin in my sys , pls help!!!