Simple webextension to include the show/movie title in the netflix tab title

main.js

function expectOne(array) {
    if(array.length === 1)
	return array[0];
    else
	throw new Error("Expected one element, got " + array.length);
}

function findMediaTitle() {
	var bag = expectOne(document.getElementsByClassName("playback-longpause-container"));
	bag = expectOne(bag.getElementsByClassName("content"));
	var mainTitle = expectOne(bag.getElementsByTagName("h2")).innerText;
	var subTitle = 
		Array.prototype.join.call(
			Array.prototype.map.call(bag.getElementsByTagName("h3"),
				                 function(x) { return x.innerText; }), " ");
	return mainTitle + " " + subTitle;
}

// Note: netflix is a single page app, and it doesn't change the title on
// navigation. This makes an event based approach a lot more messy. (the video
// element has events for playing etc.)
function poll() {

    if(!document.location.href.match("netflix.com/watch")) {
        document.title = "Netflix";
        return;
    }
    var video = document.getElementsByTagName("video")[0];

    if(!video) {
        return;
    }

    var stateStr = "playing";
    if(video.paused)
        stateStr = "paused";
    
    document.title = "Netflix: " + findMediaTitle() + " " + "[" + stateStr + "]";
}

setInterval(poll, 3000);

manifest.json

{
  "name": "Netflix title tweak",
  "version": "0.1",

  "description": "",

  "permissions": [
    "*://*.netflix.com/*"
  ],

  "content_scripts": [
    {
      "matches": ["*://*.netflix.com/*"],
      "js": ["main.js"]
    }
  ],

  "manifest_version": 2
}