I usually don't rate addons, but since this one is getting review bombed (because of the integration of a website that does Steam review summaries with LLMs (Vaporlens)), I'm writing mine.

The extension is filled with amazing features I didn't knew I wanted, but ended up loving them. Even niche things like custom steam gift card amounts is nice.

The best thing: it's open source and doesn't want to track you. Check the features and source on their website augmentedsteam.com

It's extremely customizable as well.