I recently played with Mailcow and also tried out SOGo briefly. After logging in, SOGo triggers a infobar message in the browser asking whether you want to set SOGo as the default application for mailto links in the browser. No, I just don't want to it at the moment. So I quickly clicked on "Not now". After a few days I then migrated my Roundcube and wanted to set it as the default application for mailto links, but no popup appears. Even manual calls via the browser console do not help:
window.navigator.registerProtocolHandler('mailto', location.href.split('?') [0] + '?_task=mail&_action=compose&_to=%s', “test”)Resetting the page settings, cookies, permessions etc. does not help either. It turns out that Firefox saves the "hide message" in the permissions.sqlite file and doenst clear the entry or i dont know how. FF enters a mailto-infobar-dismissed for the domain there. I removed line with SQLite editor, restarted Firefox and tada, it works.
tl;dr:
Register mailto handler doen't work with Roundcube for a domain after the popup (infobar) has been clicked away? Removed the mailto-infobar-dismissed for the (sub-)domain from permissions.sqlite