
/**
 * MediaKeys namespace.
 */
if (typeof MediaKeys == "undefined") var MediaKeys = {};
//
//MediaKeys.playButton = "//div[@class='player-control-button player-play-pause play icon-player-play']";
//MediaKeys.pauseButton = "//div[@class='player-control-button player-play-pause pause icon-player-pause']";
MediaKeys.playButton = "//div[contains(@class,'player-play-pause')]";
MediaKeys.pauseButton = "//div[contains(@class,'player-play-pause')]";
MediaKeys.skipButton = "//div[@class='player-control-button player-next-episode container-icon-player-next-episode']";
MediaKeys.previousButton = "//a[contains(@class,'player-back-to-browsing')]";

/**
 * MediaKeys namespace.
 */
if (typeof MediaKeys == "undefined") var MediaKeys = {};
//
MediaKeys.playButton = "//div[@class='player-control-button player-play-pause play icon-player-play']";
MediaKeys.pauseButton = "//div[@class='player-control-button player-play-pause pause icon-player-pause']";
MediaKeys.skipButton = "//div[@class='player-control-button player-next-episode container-icon-player-next-episode']";
MediaKeys.previousButton = "//a[contains(@class,'player-back-to-browsing')]";

Update netflix.com-view.js