Expand outdated Github Comments

To expand all comments on a github pull request you can create a bookmark with the following code:

javascript:Array.from(document.getElementsByClassName('outdated-comment')).forEach(l => l.setAttribute('open',true));

Click the bookmark while in a pull request to expand all the outdated comments.

Thanks to Brendan Annable via coderwall.com, and Lauren Brandstein for an updated version.