Step1. First and foremost, you need to launch your Mozilla Firefox 4 or higher version & Chrome Browser. I personal use Mozilla Firefox 4.0 Beta 7 to do it. Lower version may not -work.
Step2. You need to go to your Facebook pending request page. Click here to visit the pending request page.
Step3. Then scroll down to the bottom of the page to load all friend request.
Step4. Open your browser console by using the combination of Ctrl + Shift + K (Mozilla Firefox) and Ctrl + Shift + J (Google Chrome).
Step5. Copy and paste the code below into the browser console and press enterelms=document.getElementById('contentArea').getElementsByTagName('input');for(var fid in elms){if(typeof elms[fid] === 'object'){elms[fid].click();}}
Step6. Now wait and watch the entire request on your page accepted. That’s all.