Group Invite All is extension which used to add all your friends in facebook group by single click.
Everything working fine, if sometime not working then please reload the page and try again.
VERSION 3.6.1 ****
-- web.facebook.com issue fixed
VERSION 3.6 ****
-- Minor Changes
VERSION 3.5.3 ****
-- Add Bug Fixed
-- If it say group not found then please reload page with pressing `shift key`
VERSION 3.5.2 ****
-- Add Bug Fixed (Already added member not proceed again)
VERSION 3.5.1 ****
-- Add Normal Speed (0 means its speed like older version 3.4)
VERSION 3.5 ****
-- Bug Fix and Time Limiter and Start, Pause Option
To use this extension open the facebook group page and click on extension icon inside the address bar.
-- If you have any problem please send me a screenshot of your problem at my email : email@example.com or contact us on my facebook page https://www.facebook.com/offical.softarea