How to accept all your Friend Request at a time.
Step 1: First of All login to your facebook account.
Step 2: Go to https://www.facebook.com/reqs.php
Step 3: Open Console box. (Right click and select inspect element)
Copy and paste the below code in console log and press enter.
javascript: var field = document.getElementsByName("actions[accept]");for (i = 0; i < field.length; i++)field[i].click() ;