Bug 738952 - Add save as support for pdfs. r=bz, a=bajaj
Bug 722831 - qcms_transform_precacheLUT_float only works with RGB data, so only call it in that case. Grayscale images would fail. r=bgirard, a=lsblakk
Bug 554780 - Make plugins provider correctly handle plugins being added and removed through detection at runtime. r=Unfocused, a=lsblakk
Bug 843971: Add MediaManager function to report what a window is capturing r=smaug a=lsblakk ba=jorgev
Bug 843971 - Update browser-specific indicators when content gains or releases access to devices. r=dolske  a=lsblakk
Bug 843971: fix backend for GUM a/v notification in opt builds r=derf a=lsblakk ba=jorgev