how to check what default browser in linux
karthick@Ubuntu-desktop:~$ sudo update-alternatives --config x-www-browser
There are 3 choices for the alternative x-www-browser (providing /usr/bin/x-www-browser).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/bin/google-chrome 200 auto mode
* 1 /usr/bin/firefox 40 manual mode
2 /usr/bin/google-chrome 200 manual mode
3 /usr/bin/opera 90 manual mode