On ubuntu you can change your defualt browser with below steps

susha...@ubuntu:~$ sudo update-alternatives --config x-www-browser 
[sudo] password for sushanth: 
There are 2 choices for the alternative x-www-browser (providing 
/usr/bin/x-www-browser).

  Selection    Path                    Priority   Status
------------------------------------------------------------
* 0            /usr/bin/google-chrome   150       auto mode
  1            /usr/bin/firefox         40        manual mode
  2            /usr/bin/google-chrome   150       manual mode

Press enter to keep the current choice[*], or type selection number:

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