This used to be my favourite extension, but a recent UI change made it less convenient.

The dislike count is now displayed instead of the dislike icon, which means you can no longer tell at a glance whether you've already disliked a video. The like button still changes appearance when selected, but the dislike button no longer does because the icon is replaced by the number.

For comparison:
- YouTube Dislike Counter keeps both icons, but places the dislike count far to the right of the rating buttons, which looks rather awkward.
- Dislikes in YouTube™ has the best placement of the dislike count (right next to the dislike icon), but shifts the entire action bar too far to the left, causing spacing issues.

Each extension gets something right, but unfortunately none of them is currently perfect. If this one restored the original dislike icon while keeping the counter, it would easily be the best option again.

Update: I accidentally discovered that using this extension together with Dislikes in YouTube™ often results in the best overall layout: both thumb icons remain visible, the dislike counter stays next to the dislike button, and the action bar is no longer shifted to the left. Unfortunately, this combination is inconsistent and sometimes breaks after refreshing the page (the dislike icon may disappear again and the counter may display a leading zero), so it's more of a lucky workaround than a reliable solution.