How To Add All friends In A facebook Group With one click 2015

IT IS very HARD AND SO LATE TO ADD ALL FRIENDS IN GROUP ONE BY ONE

BUT I FOUND A GREAT TRICK ABOUT THAT TO ADD ALL FRIENDS WITH ONE CLICK AND YOU DON'T HAVE TO DO HARD WORK FOR IT.

1:OPEN CHROME BROWSER IF YOU DONT HAVE JUST INSTAL IT
2:TYPE GO THIS link 
3:INSTAL THIS EXTANSION (Facebook Invite All)
AND 

4:GO TO GROUP WHERE YOU WANT TO ADD YOUR FRIENDS

5:ON GROUP copy group id it will be like this

copy that and click on FB toolkit it will be in corner of your browser

click on group adder
6:paste group id
7: type numbers of friends you want to addand hit addcongrats you did it in seconds