React
React is a JavaScript library from Meta for building user interfaces using reusable components. Rather than manipulating the page directly, React keeps a virtual model of the UI and updates it efficiently when data changes, which leads to smooth, app-like experiences in the browser. React is widely used for complex web apps, and the same skills can apply to building a Google Chrome extension—small add-on software that enhances the browser. In that context, React manages the extension's popup or options pages, while the extension APIs interact with web pages or browser features.
Official WebsiteWhen to use React
Use React when the product needs rich, interactive interfaces that evolve over time: dashboards, collaboration tools, and content editors. It's also a strong choice for Chrome extensions with non-trivial UI—where component reuse, state management, and testability are crucial.
Why choose React?
Organisations choose React because of its huge ecosystem, strong community, and longevity. Patterns like hooks, mature routing libraries, and excellent TypeScript support make it a safe bet for complex front-ends. For Chrome extensions, React accelerates building polished interfaces that feel consistent with the main web app.