If youtube is in the new 2017 YouTube Material Redesign, automatically restore classic view
< Opiniones de Youtube - Restore Classic
I've removed the popup, I'm not sure why it appears since the script seems to work on your end. Sorry for the inconvenience.
Love your script! One issue though..
Hi! I love your script! Youtube screwed their website so I found this script to fix it a while back. Has been working flawlessly and my friends and I love it.. One issue though.. I keep getting this message.. http://prntscr.com/janun4 If you could fix this, it would be a kick ass script! Thanks for all the work!