When I add a Gmail account it opens Google Chrome

[Juan Simón]

$ sudo update-alternatives --config x-www-browser
  Selección Ruta Prioridad Estado
------------------------------------------------------------
  0 /usr/bin/google-chrome 200 modo automático
  1 /usr/bin/epiphany-browser 85 modo manual
* 2 /usr/bin/firefox 40 modo manual
  3 /usr/bin/google-chrome 200 modo manual

$ sudo update-alternatives --config gnome-www-browser
  Selección Ruta Prioridad Estado
------------------------------------------------------------
  0 /usr/bin/google-chrome 200 modo automático
  1 /usr/bin/epiphany-browser 85 modo manual
* 2 /usr/bin/firefox 40 modo manual
  3 /usr/bin/google-chrome 200 modo manual

In Gnome Control Center > Details > Predefined applications > Web = Firefox.

When I add an Gmail account Ubuntu opens Google Chrome, why?

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-online-accounts 3.6.2-1ubuntu1
Uname: Linux 3.11.3-20131002-i7 x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Wed Oct 2 15:37:11 2013
InstallationDate: Installed on 2013-02-11 (233 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-online-accounts
UpgradeStatus: Upgraded to raring on 2013-04-26 (159 days ago)