convert2mp3.net browser addon
With our browser addons you can quickly and easily convert your YouTube.com, Dailymotion.com, Vevo.com and Clipfish.de videos to .mp3 (music) or .mp4 (video) files directly from the video portals.
After the installation you will find two buttons on youtube and the other supported platforms, which are named with "Download MP3" and "Download MP4". One click on the button and your video starts converting.
(click to enlarge)
How to install:
Click on "Download for Firefox" to open the Firefox Extensions portal.
Click on "Add to Firefox", than click on "allow".
After this click on "install".
Click on "Download for Safari" to download the addon.
Doubleclick on the downloaded .safariextz file.
Click on "install", to install the addon.
Click on "Download for Opera" to open the Opera extensions portal.
Click on "Add to Opera", than click on "install".