Bug 924723 - Bookmark a page only when left-clicking the star icon. r=mak
Bug 929139 - Remove assert check for impossible unknow state because some devices (ex: emulator) may not have sys node for headset switch state. r=dougt
Bug 931246 - Update pdf.js to version 0.8.641. r=yury
Bug 875731 - /toolkit/content/ Replace callers of nsIDownloadManager.usersDownloadsDirectory with Downloads.getUserDownloadsDirectory. r=paolo
Bug 926489 - Replace className with classList. r=dao
Merge m-c to f-t
Bug 924858 - Part 1: Add |append| mode flag to OS.File.open on Unix. r=yoric

To match previous behavior, this mode flag will default to |true|.
Bug 924858 - Part 2: Implement |append| mode for OS.File.open on Windows. r=yoric
Bug 926635 - Improve layout of uncaught Promise.jsm error messages. r=Yoric
Merge f-t to m-c