hello arjun.rs, thanks for your interest in firefox os. currently mozilla's focus for firefox os is getting it shipped on as many dedicated devices as possible (and they should soon be available in india too).
there is no official support provided for flashing it onto third-party devices - this is no straightforward process and there will be issues with drivers and other stuff. for popular devices like the nexus series there might be resources provided by the community. you'd may want to try looking around in a more developer focused forum like http://forum.xda-developers.com/index.php and see if there is anything available for your device by any chance...

There is no such thing as "Mozilla OS" as you likely meant "Firefox OS"

https://www.mozilla.org/en-US/firefox/os/devices/

hi again, here is today's product announcement by mozilla about the first firefox os device in india: https://blog.mozilla.org/blog/2014/08/25/first-firefox-os-smartphones-available-in-india-this-week/