Audio Only for YouTube™ extension let you easily load YouTube videos with audio only content.
Toolbar button serves as ON|OFF switch. When the button's color is red, the add-on is active and when the color is lite grey, it is inactive. Please note that, default state is active.
When you open a YouTube page and play a video, the add-on automatically loads audio source only and prevents the video content from loading. This way, you will save your internet bandwidth because the video content is much larger in size comparing to the audio content. Moreover, when you just want to "listen" to a video, there is no need to load the video content at all.
Important note: Audio Only for YouTube™ add-on does NOT belong or relate to YouTube and has NO affiliations with Google Inc. or YouTube website at all. It is basically an unofficial extension that is developed and maintained independently by its author. YouTube™ is a registered trademark of Google Inc.
Note: if you have a feature request, or found a bug to report, please fill the bug report form in the add-on's homepage (http://mybrowseraddon.com/audio-only-for-youtube.html).