Tumblr mp3 Download
Last updated: June 30th, 2015
This small script adds a button inside the audio iframes found in common Tumblr posts with music in them.
The script will wait for Tumblr to load the mp3 song (this happens the first time you press play) to catch it and provide you of a link to the file, which can be saved with a quick right-click > Save as. You'll know the download link is ready when the button turns in yellow.
Simply install this script and it will do its job right after the page load its main contents. No special GM permissions are required so far.