Rust Search Extension is described as 'A handy browser extension to search Rust docs and crates, etc in the address bar instantly!' and is an app in the Development category. There are five alternatives to Rust Search Extension for Windows, Linux, Mac and Online / Web-based. The best alternative is Zeal, which is both free and Open Source. Other great apps like Rust Search Extension are Dash (Paid), Velocity (Freemium), Go Search Extension (Free, Open Source) and Devbook (Free).
Zeal is a simple offline API documentation browser inspired by Dash (OS X app), available for Linux and Windows. - Quickly search documentation using Alt+Space (or customised) hotkey to display Zeal from any place in your workspace.
Dash is an API Documentation Browser and Code Snippet Manager. Dash stores snippets of code and instantly searches offline documentation sets for almost any API you might use. You can even generate your own docsets or request docsets to be included.
Search Golang std docs and third packages in your address bar instantly! Golang Search is a handy browser plugin to help the Golang developers searching standard docs and libraries in the address bar instantly.