WordPress has launched an official browser extension (available on Chrome Web Store and Safari's Mac App Store) that enhances the developer and admin experience. Key features include hiding the admin bar and relocating admin controls to the browser toolbar, showing WordPress detection status across websites, one-click login access to sites you manage, and developer tools for testing (mobile preview, cache clearing, block boundary display). This is valuable for WordPress professionals and agencies managing multiple sites, improving workflow efficiency while reducing UI clutter.