stopgap measure until tdf#57873 is fully implemented,
since these days by far more people use Thunderbird
than Seamonkey (or Firefox address book, if the latter
even has any...).

Change-Id: I638ec90277063b1e7536c045bffb1052d3b76911
Reviewed-on: https://gerrit.libreoffice.org/14793Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>