default browser

I’m using XFCE as DE, and Google Chrome as my main browser. I also have Firefox installed.
In XFCE settings - “Preferred Applications” I have chosen Chrome as default browser, as well as in Chrome’s own settings.

However, some applications don’t care about these settings and launch Firefox instead when I click on a link or notifications, for example Empathy and gnome-gmail-notifier.

How can I make these apps open Chrome instead of Firefox?