DataFox: BSNL broadband bandwidth usage monitor

Many of us like me uses BSNL broadband and have limited usage per their respective plan. I use a plan which gives 2.5GB of free bandwidth.  This includes both upload and download usage.  Beyond the free usage, each MB is charged with 80 paise.  (ரொம்ப ஓவர் தான்... என்ன பண்றது)
Guy like me end up paying more than the minimum amount some months because of not checking the balance bandwidth during end of the month.  Earlier, many times I had to go to BSNL data usage site and check my balance bandwidth for the month.   However, now it is not required.  Since I use Firefox for all my browsing, I can use a brilliant add-on DataFox.
DataFox is a bandwidth usage monitor for BSNL’s DataOne and MTNL’s TriBand broadband services. DataFox is a cross platform extension written for Firefox; if you use Internet Explorer or any other browser, DataFox will not work for you.
If you’re using Firefox, click here to install the extension directly. Once installed, you need to restart Firefox.

Use

DataFox is really easy to use. Once installed, you should see this icon () in your status bar. Click it to bring up the login dialog. Select your ISP, then enter your name and password and click the Login button; that’s it. Click the icon again to refresh the usage data. You will see the total usage for the month as in the below screenshot.

DataFox works by obtaining usage information directly from the BSNL / MTNL usage site, it does not monitor your network in any way, so usage details probably won’t change until you logout of DataOne / TriBand and log back in again. BSNL users may want to use the Override default domain option in the login dialog in case the BSNL server you are being directed to is not responding (see below for explanation). Users who normally use bbservice.bsnl.in/data.bsnl.in to check their usage must check this option and select the corresponding domain from the domain list. MTNL users, if the usage server is down, DataFox will not be able to fetch any usage records.