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Localhost and developer tools

On Mac, Crest automatically shows its developer toolbar for local development addresses. This includes localhost, loopback and private-network addresses, single-label hosts, common local suffixes such as .local and .test, and file URLs.

Toolbar controls​

  • Edit the complete development URL without losing the visible route.
  • Copy the current link.
  • Open Site Settings and inspect permissions.
  • Use Capture in Portrait Mode, Copy Full Page Capture, or drag a region to copy it.
  • Toggle the Web Inspector Console, Network panel, or element inspection.

The toolbar leaves when the focused page is no longer a local-development address, keeping ordinary browsing chrome quiet.

Open Web Inspector directly​

Use Option-Command-I, the menu, or the command palette. Web Inspector follows the focused page, including the focused card inside Split View.

Security boundary​

Developer tools make page internals visible and can change runtime state. Use them only for sites and code you trust. A certificate warning, external-app request, or protected permission remains subject to Crest’s normal navigation and site-permission policies; localhost mode does not bypass those checks.