YouTube High Definition

YouTube High Definition is a powerful tool that automatically plays all YouTube videos in HD, changes video player size, offers auto-stop and mute, and much more.

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YouTube High Definition is available to install from Firefox Browser Add-ons and for download from this page. It has 162,400 active users The latest version is 118.0.5, and it was published 8 months ago.

All available versions

You can find the current and older versions of YouTube High Definition here. You can download the archived versions or inspect their source codes.

As a free user, you can only download the latest version.

How to install YouTube High Definition from an XPI file

1. Simply drag-and-drop the XPI into Firefox to install the add-on.

How to install YouTube High Definition from a ZIP file

1. Download the YouTube High Definition ZIP file
2. In Firefox browser, go to about:addons to open Add-ons Manager
3. Click on , then select Install Add-on From File
4. Select the YouTube High Definition ZIP file from step 1. YouTube High Definition is now installed on your browser.