what is the exact command? it should be "firefox %s", if it's set to /usr/lib/firefox then that's a duplicate of a known firefox issue, it's setting the wrong value when it asks if firefox should be the default browser
what is the exact command? it should be "firefox %s", if it's set to /usr/lib/firefox then that's a duplicate of a known firefox issue, it's setting the wrong value when it asks if firefox should be the default browser