#extensions

Live Firefox add-on stats from the official Mozilla Add-ons (AMO) API — no key, nothing stored. The adoption-and-reputation view of the Firefox ecosystem: how many users an extension or theme has, how it is rated and reviewed, and which add-ons are most popular, distinct from the other developer-ecosystem and package APIs in the catalogue. The addon endpoint returns a single add-on in full — its average daily users, weekly downloads, the star rating with review count, authors, version, type and categories. The search endpoint searches add-ons sortable by users, rating or relevance, each with its user count and rating. The top endpoint returns the most-used add-ons, optionally filtered to extensions or themes. Build extension-popularity dashboards, "is this add-on still maintained and trusted" widgets, competitor trackers and developer-portfolio tools on top of real Mozilla Add-ons data. Look up an add-on by its slug (ublock-origin, darkreader); average daily users is the headline popularity metric and the rating is the community reputation.

api.oanor.com/mozillaaddons-api

The open VS Code extension registry — Open VSX — as an API. Open VSX is the vendor-neutral marketplace behind VSCodium, Gitpod, Eclipse Theia, Cursor and many other editors. Look up any extension by its namespace.name id for its display name and description, latest version, publisher, total download count, average rating, license, categories and tags, repository and homepage links, and the exact `code --install-extension` command; read an extension's full version history; and search the registry by keyword, ranked by downloads. Covers the editor-extension ecosystem from Python, Java and ESLint to Prettier, GitLens and the major themes and language packs. Live from the official open-vsx.org API. Ideal for editor and IDE tooling, extension catalogs and dashboards, and developer-portal integrations. Open data from Open VSX.

api.oanor.com/openvsx-api