Changelog:

• Allow protocol module to be imported before the ready event of app module. #5406
• Add context-menu event to WebContents. #5379
• Add process.defaultApp property. #5421
• Fix protocol.registerStandardSchemes(schemes) not working. #5406
• Fix file system indexing not working in devtools. #5431
• Fix crash when replying to the same synchronous message more than once. #5430
• Fix expirationDate not showing for persistent cookies in session.cookies.get API. #5444
• Fix protocol.registerStandardSchemes(schemes) not working. #5406
• Fix exception after creating large numbers of renderer processes. #5491
• Fix devtools extension repeatedly loaded when changing dock state. electron/brightray#219

OS X

• Disable the scroll bounce (rubber banding) effect by default. #5412
• Add scrollBounce option to webPreferences. #5412
• Add app.setUserActivity(type, userInfo), app.getCurrentActivityType() APIs and continue-activity event for Handoff feature of OS X. #5352
• Add app.dock.downloadFinished(filePath) API. #5477
• Fix high CPU usage when using pty.js Node module. #5378
• Fix app.removeAsDefaultProtocolClient(protocol) API not working. #5440

Linux

• Resize the icon of dialog.showMessageBox() to a suitable size. #5496