Disables fextralife embedded stream, see https://www.youtube.com/watch?v=iopeUvrYX9Q for more details
Fextralife is a wiki site that uses Twitch embed feature to artificially ramp up their Twitch users, so that they can earn money from advertising and therefore steal from smaller creators.
This small hack (no noticeable performance hit) disables their embedded stream.
More details here:
https://www.youtube.com/watch?v=iopeUvrYX9Q