Note to self: the next time you want to change your default browser, here's how.
$ xdg-mime default chromium.desktop x-scheme-handler/http $ xdg-mime default chromium.desktop x-scheme-handler/https $ xdg-mime default chromium.desktop text/html $ sudo update-alternatives --set x-www-browser /usr/bin/chromium
The state is that great fiction by which everyone tries to live at the expense of everyone else. - Frederic Bastiat