Script which uses the Tampermonkey extension to add faster and slower buttons to Youtube videos below the subscribe button. The faster button increases the speed of video by 10% and the slower one (you guessed it) decreases it by 10%.

• Install Tampermonkey extension (I use it in Google Chrome).
• Go Create new script.
• Copy paste the script (main.js).
• Reload youtube and you should see two buttons below the Subscribe button.
• Feel free to modify anything you want in the code :).
• Enjoy!