Youtube MP3 Download Button
Adds a MP3 Download button next to the subscribe button, thanks to youtubeinmp3 for their simple download service (http://youtubeinmp3.com/api/). Based off magnus's youtube2mp3 code. Just used something different as it wont open another tab.
Disable YouTube 60 FPS (Force 30 FPS)
Tells YouTube that your browser only supports videos at 30FPS or less, which switches all 60FPS videos to 30FPS and allows old computers to watch high-resolution videos without stutter!
Best Youtube MP3 Converter, convert any online video into MP3
Add a button to convert youtube to MP3 directly. Convert the video into mp3 with the best quality. The bitrate will be calculated precisely, which ranges from 128kbps to 320kbps depending on original file. Allows you to convert any online video into MP3 audio file. Support most oneline video sites like YouTube, Vemo, Viki, Dramafever, TED and 5000 more.