Crx搜搜 is an aggregated search, jump and download entry for browser extensions and apps. It covers Chrome, Edge, Firefox and Opera extension stores, as well as Microsoft Store apps, and can be used to find installation packages and historical versions.

Visit crxsoso.com to use it. The site states that login unlocks more features, including downloading historical versions, fast download mode, saving extensions/apps, and viewing browsing history. The available material does not show self-hosting, pricing, or resource requirements. Note that its capabilities depend on the aggregated store resources; the official site appears to provide a Chinese interface, and regional availability or compliance requirements are not specified.