opensuse 13.1 x86_64
FF 34.0.5

click on hello icon
then
select user tab
then click "import" to import your google contacts
then
you have this error :
***********************************************
GOOGLE

401. That���s an error.

Error: invalid_client

The OAuth client was not found.
Request Details

    scope=https://www.google.com/m8/feeds
    response_type=code
    redirect_uri=urn:ietf:wg:oauth:2.0:oob:auto
    client_id=no-google-oauth-api-clientid

That���s all we know.
**********************************************

see https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1401402

they explain that "Apparently, for the import feature to work, the build needs
to include Google OAuth Client ID."