open terminal and execute following commands


$ xdg-mime default browser.desktop x-scheme-handler/http
$ xdg-mime default browser.desktop x-scheme-handler/https

replace browser with chromium or firefox

example


$ xdg-mime default chromium.desktop x-scheme-handler/http
$ xdg-mime default chromium.desktop x-scheme-handler/https

or


$ xdg-mime default firefox.desktop x-scheme-handler/http
$ xdg-mime default firefox.desktop x-scheme-handler/http
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