PlayTagger is an extension that adds a play button to every mp3 link so you can easily play the mp3 directly on the website without downloading it.
Simply install this extension and all mp3 links will automatically become playable right on the page itself. In addition, you will have the opportunity to easily tag and post the mp3 link to Delicious and share it with your friends.
Ported from http://www.delicious.com/help/playtagger
You may need to enable the following settings in opera:config in order to make this extension work on some web pages: