Changelog

Version 0.14.0

Oct 7, 2026

Lit Inspector now runs in Firefox. Every release carries a Firefox build next to the Chrome one, with the same Lit tab; sites are enabled from its toolbar popup, because Firefox doesn’t let DevTools ask for access. Performance tracks reach browsers without Chrome’s custom tracks as User Timing marks, the Timeline opens in Tracks, and the extension has a new icon. Nothing needs action to upgrade.

Added

Lit Inspector for Firefox. GitHub releases now include lit-inspector-<version>-firefox.zip, a Firefox 140+ add-on with the same Lit tab, loaded from about:debugging until it’s on addons.mozilla.org. Enable a site from the Lit Inspector toolbar popup; since Firefox can’t name a port in site access, enabling localhost:5173 covers every port on localhost.
Performance tracks in Firefox, Safari and older Chrome. Where the browser has no custom tracks, the performance tracks setting (formerly chrome performance tracks) writes Lit’s updates and input as User Timing marks named lit:…, which show in the Firefox Profiler’s Marker Chart next to the browser’s own work. Its help and “Where to find them” link follow the browser.

Changed

The Timeline opens in Tracks. A first visit shows the recording as lanes on a shared time axis instead of the list; switch with List | Tracks, and the panel remembers your choice.
Lit Inspector has a new icon. The extension’s toolbar button, DevTools tab and panel header show a magnifying glass in Lit’s blues.
The pick tooltip shows the component icon everywhere. In the browser extension and with lit-devtools dev, the tooltip over a picked component has the same component icon as under the Vite plugin, not just the tag name.

Fixed

The Lit tab notices a site enabled from another window. Enabling or disabling Lit Inspector for a site in one DevTools window now updates the Lit tab in every other window on that site, and Enable on this site no longer asks for access the extension already has.