I know how to make it play at 2x, but how can I make the browser do it by default?

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    okay i've added question details to specify that i want youtube to make it the default option. – InquilineKea Oct 9 '14 at 20:04
  • Okay - I've removed details about browser/OS specifications. – InquilineKea Oct 9 '14 at 20:07
  • For hackers, there might be a possible solution via the youtube JS API: stackoverflow.com/questions/22604934/…, perhaps in conjunction with a browser extension that always excutes the sample Javascript on youtube? – Jonathan Mar 18 '15 at 2:26

If you are using Chrome, you can use ImprovedTube extension to make this happen. Followings are steps to achieve (tested):

  1. Add the extension from the Chrome Web Store: ImprovedTube
  2. Click on the extension icon and set Playback Speed to 2
  3. Refresh YouTube if you've already opened it.
  4. Enjoy!
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  • Do you know if there is a FireFox analogue of ImprovedTube? – Geremia Mar 11 '16 at 22:27

I used an extension that allows me to change this via a script. I have been using Violentmonkey myself, as it is open source, has an intuitive user interface and is available for Chrome, Opera, Firefox and others. There are also alternatives such as Greasemonkey and Tampermonkey.

// ==UserScript==
// @name        Youtube Playback Rate
// @namespace   Violentmonkey Scripts
// @match       *://youtube.com/*
// @match       *://www.youtube.com/*
// @grant       Any
// @version     1.0
// @author      Jason Miller
// @description 12/1/2019, 8:00:00 AM
// @run-at      document-start
// ==/UserScript==

sessionStorage.setItem("yt-player-playback-rate", JSON.stringify({
    "data": "2",
    "creation": Date.now(),

The speed can be adjusted by changing the "2" after "data" to any value in the range 0.25–2.

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    still works today (20th apr 2020) – CodeFarmer Apr 20 at 13:46

Video Speed Controller Firefox Chrome works on more sites than just YouTube, and with Preferred Speed (x) set to 2 and Remember Playback Speed checked, you need only press g if it's not at the speed you want (to temporarily go back to 1x and back again)

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