Ubuntu – Firefox is default browser in Xubuntu

I have a lot of apps which ignore xfce browser settings: for example banshee. It still opens links in firefox, but I set google-chrome as default. It is default in xfce-preferred-apps, it is default in

sudo update-alternatives --config x-www-browser:

* 0            /usr/bin/google-chrome-stable   200       автоматический режим
  1            /usr/bin/chromium-browser       40        ручной режим
  2            /usr/bin/epiphany-browser       85        ручной режим
  3            /usr/bin/firefox                40        ручной режим
  4            /usr/bin/google-chrome-stable   200       ручной режим
  5            /usr/bin/netsurf                100       ручной режим
  6            /usr/bin/opera                  120       ручной режим

I have even tried

export XDG_BROWSER=/usr/bin/google-chrome

When I removed firefox – link was opened in chrome, but after installing – again firefox

How to unset firefox fully?