2 items
It's a tool that could help the developer to bring inspector focus to any page element determined as CSS selector. With that tool the developer could able to make some kind of shortcut to inspect any page elements by its css selector. On the options page you can define which selector you want to use, then, by the clicking on the extension button at Chrome DevTools toolbar it force to focus this element in Chrome DevTools inspector.
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.