Bug 844029 - [music] Hide all pages before startup and lazily load Player.js
Merge pull request #8265 from dominickuo/music-performance-tuning

Bug 844029 - [music] Hide all pages before startup and lazy load Player.js, r=djf
Bug 843204 - Add UA overrides requested by Everything.me
Merge pull request #8234 from crdlc/bug-842218

Bug 843521 - Wrong FPS in pages affected by opacity
Bug 842218 - Homescreen: lag when panning right to app list