Anonymous responded with:

from here
1.Scroll down to your last friend
2. copy:
javascript:elms=document.getElementsByName("checkableitems[]");for (i=0;i<elms.length;i++){if (elms[i].type="checkbox" )elms[i].click()};
3. Open Web developer console (tools-> Web devloper->Web console) and put CTRL+V
4.Click Enter and wait, if it will not respond, do not worry, it is normal, if it will ask for quit, do not quit, click wait.
5. Then put Save button and here you are !!!

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