Bug 1017294 - Add fastforward/rewind to music widget
Merge pull request #24934 from shamenchens/Bug1017294-MusicWidgetFastforward-2

Bug 1017294 - Add fastforward/rewind to music widget, r=dkuo
fully refactored PP but still in dev_apps
patches to fix most bugs and move to apps
changes to address all requests
[Privacy Panel] push request
 Changes proposed by Tim
fix small typo
second part of changes