UPDATED 2/18/2016 - Invite all your Facebook friends with one click. The FB tool that scrolls and selects all friends.
Recently updated to comply with changes to chrome security and Facebook Select All Friends 2015 limitations.
The paid price is $5.99 and will be guaranteed to work or be patched within 48 hours of a major change from Chrome or Facebook. Facebook Select All Friends 2014 is the app if you are tired of clicking over and over again.
The facebook select all friends 2015 extension not only selects all your facebook friends in an invite window, it will also automatically scroll your facebook invite window to allow all your friends list to load fully via AJAX.
Facebook Select All Friends 2014 is another kick ass extension from Kick Some Apps, Inc.