If you want to add your all friends in group by just single click then follow all steps carefully.
- Firstly open Mozilla Firefox
- Now Open your Facebook group in which you want to add your friends
- Then Click Ctrl + Shift + K
- Now Paste...
- Then press Enter
- After then to hide box press again Ctrl + Shift + K
Just take a look on all steps how to do as shown below.
If Face any type of problem and want any type of sugestion just feel free to share your comment.