# DevTools features by host > Which Lit DevTools features work under the Vite plugin, in the Chrome extension and in the Firefox extension. Look up whether a DevTools feature works where you inspect the page. The panel is the same everywhere; what changes is what its host can reach. ## Hosts * ![](/_astro/vite.Bs_r76O8.svg) **Vite plugin**: the panel docked in Vite DevTools or in its own tab at `/__lit/`, which the dev server serves even without Vite DevTools, on a page your Vite dev server serves. * ![](/_astro/chrome.CRByiUFQ.svg) **Chrome extension**: [Lit Inspector](/guides/devtools/browser-extension/), a **Lit** tab in Chrome DevTools, on any http(s) page. It has no server behind it. * ![](/_astro/firefox.1bWoP6pv.svg) **Firefox extension**: the same extension for Firefox, from Firefox Add-ons. `lit-devtools dev` behaves like the extensions, plus **Export snapshot** and the MCP tools, because it runs a Node server. See [the CLI reference](/reference/cli/). Where a feature depends on the browser rather than the host, the browser is named in brackets. ## Where it runs | | ![](/_astro/vite.Bs_r76O8.svg) Vite plugin | ![](/_astro/chrome.CRByiUFQ.svg) Chrome extension | ![](/_astro/firefox.1bWoP6pv.svg) Firefox extension | | ------------------- | ------------------------------------------ | ------------------------------------------------- | --------------------------------------------------- | | Browsers | Any (Chrome-only features marked) | Chrome 114+ | Firefox 140+ | | Pages | Your dev server | Any http(s) page, production builds included | Any http(s) page, production builds included | | Page CSP | Same-origin scripts from Vite | Not affected | Not affected | | Turning it on | `timeline: true` in the plugin options | Per site, from the **Lit** tab | Per host, on every port, from the toolbar popup | | Frames | Top page | Top frame only | Top frame only | | Needs a Node server | Yes | No | No | ## Components tab | Feature | ![](/_astro/vite.Bs_r76O8.svg) Vite plugin | ![](/_astro/chrome.CRByiUFQ.svg) Chrome extension | ![](/_astro/firefox.1bWoP6pv.svg) Firefox extension | | -------------------------------------------------------- | ------------------------------------------ | ------------------------------------------------------------------ | ------------------------------------------------------------------ | | Live component tree | Yes | Yes | Yes | | Hover highlight and **Reveal** | Yes | Yes | Yes | | Pick an element on the page | With `sourceOverlay` | Yes, any Lit element | Yes, any Lit element | | Properties, state, attributes | Yes | Yes | Yes | | Tasks, signals, controllers | Yes | Yes (controllers can be missing from minified builds) | Yes (controllers can be missing from minified builds) | | Native `#private` fields | With `privateFields` | No | No | | Source link and **Rendered at** link | With `sourceOverlay` | Both, from the page’s sourcemaps and template text | Both, from the page’s sourcemaps and template text | | Reveal in the Elements panel | No | Yes | Yes | | Follow the Elements selection | No | Yes | Yes | | Lit tab in the Elements sidebar | No | Yes | Yes | | Open in the Sources panel | No | Yes | No | | Open in editor | Yes | On a Vite dev server | On a Vite dev server | | Docs from Custom Elements Manifests | Yes | Linked by the page, found beside its scripts, or added in Settings | Linked by the page, found beside its scripts, or added in Settings | | HMR patch line and issues banner | Yes | No | No | | Request update | Yes | Yes | Yes | | `$lit` and Store as global variable | Yes | Yes | Yes | | Flash updates | Yes | Yes | Yes | | Empty-tree diagnosis (no runtime, duplicate Lit, iframe) | Yes | Yes | Yes | ## Updates tab | Feature | ![](/_astro/vite.Bs_r76O8.svg) Vite plugin | ![](/_astro/chrome.CRByiUFQ.svg) Chrome extension | ![](/_astro/firefox.1bWoP6pv.svg) Firefox extension | | ------------------------------------------ | ------------------------------------------ | ------------------------------------------------- | --------------------------------------------------- | | Per-component counts, update time, reasons | Yes | Yes | Yes | | Error attribution | Yes | Yes | Yes | | Old and new values | Yes | Yes | Yes | | Source and **Rendered at** links | With `sourceOverlay` | No | No | ## Timeline tab | Feature | ![](/_astro/vite.Bs_r76O8.svg) Vite plugin | ![](/_astro/chrome.CRByiUFQ.svg) Chrome extension | ![](/_astro/firefox.1bWoP6pv.svg) Firefox extension | | ---------------------------------------------------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- | --------------------------------------------------------- | | Record, stop, clear | Yes | Yes | Yes | | Lifecycle, changed values, mouse, keyboard, custom events layers | Yes | Yes | Yes | | Render and Lit warnings layers | Yes | Lit development builds only | Lit development builds only | | List and Tracks views, filters, span detail | Yes | Yes | Yes | | Custom layers from `addTimelineEvent` | Yes | No | No | | Export snapshot | Yes | No | No | | Performance tracks | Yes (Chrome 134+: a Lit track group; other browsers: User Timing marks) | Yes (Chrome 134+: a Lit track group; Chrome 114–133: User Timing marks) | User Timing marks, in the Firefox Profiler’s Marker Chart | ## Settings, HMR and agents | Feature | ![](/_astro/vite.Bs_r76O8.svg) Vite plugin | ![](/_astro/chrome.CRByiUFQ.svg) Chrome extension | ![](/_astro/firefox.1bWoP6pv.svg) Firefox extension | | -------------------------------------------- | ------------------------------------------ | ------------------------------------------------- | --------------------------------------------------- | | Light and dark appearance | Yes | Yes | Yes | | Plugin settings and live overrides | Yes | No | No | | Page preferences (flash, performance tracks) | Yes | Yes | Yes | | About (versions, duplicate Lit, layers) | Yes | Yes | Yes | | Hot patching and the HMR indicator | Yes | No | No | | Deep links (`#tab=…&component=…`) | Yes | No | No | | Follows the page you switch to | Across tabs, with a notice | The inspected tab, across navigations | The inspected tab, across navigations | | MCP tools for coding agents | Yes | No | No | ## Related [DevTools architecture](/concepts/devtools-architecture/)Where the panel runs, how it reaches the page, and where its settings live. [Compatibility](/reference/compatibility/)Supported Node, Vite, Lit and browser versions.