2 items
Switch to an existing tab when the same URL is opened, instead of keeping a duplicate. When working, it is common to have many tabs open, making it difficult to remember whether a specific page is already active. "Only One Tab" checks existing tabs whenever a URL is opened in a new tab; if it detects a matching URL, it navigates directly to the existing page and closes the newly created duplicate tab.
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.