You will need to install a user script manager extension to install this script.
If you have retweeted or liked the tweet, then you'll also see "Liked" or "Retweeted" spelled out along with the counts. I can't do anything about that since this is just a simple CSS stylesheet. It's not a bug you have to tell me about, nor is it something I can fix. The text is all coming from the website itself, made to be read aloud by accessibility software for the visually impaired, and I'm just using a simple trick to make it appear on the screen. For the same reason, I can't do anything about the "0" that appears when there's no activity on a Tweet.
NOTE: You may see scary looking "syntax errors" appear when installing/editing with Stylus, but I swear everything's fine. I think it's just an issue with that extension's built-in editor. (If you just type a space or something into the main text box, the errors all go away.)