Switch default browser from the command line
Run:
$ sudo update-alternatives --config x-www-browser
You should see the list of browsers installed:
There are 3 choices for the alternative x-www-browser (providing /usr/bin/x-www-browser).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/abrowser 40 auto mode
1 /usr/bin/abrowser 40 manual mode
2 /usr/bin/luakit 30 manual mode
3 /usr/bin/surf 30 manual mode
Press <enter> to keep the current choice[*], or type selection number:
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