diff --git a/desktop/plugins/hermesdebuggerrn/ChromeDevTools.tsx b/desktop/plugins/hermesdebuggerrn/ChromeDevTools.tsx
new file mode 100644
index 000000000..bc4a040f5
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/ChromeDevTools.tsx
@@ -0,0 +1,103 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import React from 'react';
+
+import electron from 'electron';
+
+const devToolsNodeId = (url: string) =>
+  `hermes-chromedevtools-out-of-react-node-${url.replace(
+    /[^a-zA-Z0-9]+/g,
+    '-',
+  )}`;
+
+// TODO: build abstractionf or this: T62306732
+const TARGET_CONTAINER_ID = 'flipper-out-of-contents-container'; // should be a hook in the future
+
+function createDevToolsNode(url: string): HTMLElement {
+  const existing = findDevToolsNode(url);
+  if (existing) {
+    return existing;
+  }
+
+  // It is necessary to activate chrome devtools in electron
+  electron.remote.getCurrentWindow().webContents.toggleDevTools();
+  electron.remote.getCurrentWindow().webContents.closeDevTools();
+
+  const wrapper = document.createElement('div');
+  wrapper.id = devToolsNodeId(url);
+  wrapper.style.height = '100%';
+  wrapper.style.width = '100%';
+
+  const iframe = document.createElement('webview');
+  iframe.style.height = '100%';
+  iframe.style.width = '100%';
+
+  // // HACK: chrome-devtools:// is blocked by the sandbox but devtools:// isn't for some reason.
+  iframe.src = url.replace(/^chrome-/, '');
+
+  wrapper.appendChild(iframe);
+  document.getElementById(TARGET_CONTAINER_ID)!.appendChild(wrapper);
+  return wrapper;
+}
+
+function findDevToolsNode(url: string): HTMLElement | null {
+  return document.querySelector('#' + devToolsNodeId(url));
+}
+
+function attachDevTools(devToolsNode: HTMLElement) {
+  devToolsNode.style.display = 'block';
+  document.getElementById(TARGET_CONTAINER_ID)!.style.display = 'block';
+}
+
+function detachDevTools(devToolsNode: HTMLElement | null) {
+  document.getElementById(TARGET_CONTAINER_ID)!.style.display = 'none';
+
+  if (devToolsNode) {
+    devToolsNode.style.display = 'none';
+  }
+}
+
+type ChromeDevToolsProps = {
+  url: string;
+};
+
+export default class ChromeDevTools extends React.Component<
+  ChromeDevToolsProps
+> {
+  createDevTools(url: string) {
+    const devToolsNode = createDevToolsNode(url);
+    attachDevTools(devToolsNode);
+  }
+
+  hideDevTools(_url: string) {
+    detachDevTools(findDevToolsNode(this.props.url));
+  }
+
+  componentDidMount() {
+    this.createDevTools(this.props.url);
+  }
+
+  componentWillUnmount() {
+    this.hideDevTools(this.props.url);
+  }
+
+  componentDidUpdate(prevProps: ChromeDevToolsProps) {
+    const oldUrl = prevProps.url;
+    const newUrl = this.props.url;
+    if (oldUrl != newUrl) {
+      this.hideDevTools(oldUrl);
+      this.createDevTools(newUrl);
+    }
+  }
+
+  render() {
+    return <div style={{height: 0}} />;
+  }
+}
diff --git a/desktop/plugins/hermesdebuggerrn/ErrorScreen.tsx b/desktop/plugins/hermesdebuggerrn/ErrorScreen.tsx
new file mode 100644
index 000000000..d84083947
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/ErrorScreen.tsx
@@ -0,0 +1,108 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import React from 'react';
+import {styled, FlexColumn, FlexRow, Text, Glyph, colors} from 'flipper';
+
+const Container = styled(FlexColumn)({
+  height: '100%',
+  width: '100%',
+  justifyContent: 'center',
+  alignItems: 'center',
+  backgroundColor: colors.light02,
+});
+
+const Welcome = styled(FlexColumn)({
+  width: 460,
+  background: colors.white,
+  borderRadius: 10,
+  boxShadow: '0 1px 3px rgba(0,0,0,0.25)',
+  overflow: 'hidden',
+  transition: '0.6s all ease-out',
+});
+
+const Title = styled(Text)({
+  fontSize: 24,
+  fontWeight: 300,
+  textAlign: 'center',
+  color: colors.light50,
+  marginTop: 16,
+  marginBottom: 16,
+});
+
+const Item = styled(FlexRow)({
+  padding: 10,
+  alignItems: 'center',
+  borderTop: `1px solid ${colors.light10}`,
+});
+
+const ItemTitle = styled(Text)({
+  color: colors.light50,
+  fontSize: 14,
+  lineHeight: '20px',
+});
+
+const Bold = styled(Text)({
+  fontWeight: 600,
+});
+
+const Icon = styled(Glyph)({
+  marginRight: 11,
+  marginLeft: 6,
+});
+
+// As more known failures are found, add them to this list with better error information.
+const KNOWN_FAILURE_MESSAGES: Record<
+  string,
+  Record<'message' | 'hint', string>
+> = {
+  'Failed to fetch': {
+    // This is the error that is returned specifcally when Metro is turned off.
+    message: 'Metro disconnected.',
+    hint: 'Please check that metro is running and Flipper can connect to it.',
+  },
+  default: {
+    // All we really know in this case is that we can't connect to metro.
+    // Do not try and be more specific here.
+    message: 'Cannot connect to Metro.',
+    hint: 'Please check that metro is running and Flipper can connect to it.',
+  },
+};
+
+function getReason(error: Error) {
+  let failure_message = KNOWN_FAILURE_MESSAGES.default;
+  if (error != null && KNOWN_FAILURE_MESSAGES[error.message]) {
+    failure_message = KNOWN_FAILURE_MESSAGES[error.message];
+  }
+
+  return (
+    <ItemTitle>
+      <Bold>{failure_message.message} </Bold>
+      {failure_message.hint}
+    </ItemTitle>
+  );
+}
+
+type Props = Readonly<{
+  error: Error;
+}>;
+
+export default function ErrorScreen(props: Props) {
+  return (
+    <Container>
+      <Welcome>
+        <Title>Hermes Debugger Error</Title>
+        <Item>
+          <Icon size={20} name="caution-octagon" color={colors.red} />
+          <FlexColumn>{getReason(props.error)}</FlexColumn>
+        </Item>
+      </Welcome>
+    </Container>
+  );
+}
diff --git a/desktop/plugins/hermesdebuggerrn/LaunchScreen.tsx b/desktop/plugins/hermesdebuggerrn/LaunchScreen.tsx
new file mode 100644
index 000000000..eb9fa0b76
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/LaunchScreen.tsx
@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import React from 'react';
+import {styled, FlexColumn, FlexRow, Text, Glyph, colors} from 'flipper';
+
+const Container = styled(FlexColumn)({
+  height: '100%',
+  width: '100%',
+  justifyContent: 'center',
+  alignItems: 'center',
+  backgroundColor: colors.light02,
+});
+
+const Welcome = styled(FlexColumn)({
+  width: 460,
+  background: colors.white,
+  borderRadius: 10,
+  boxShadow: '0 1px 3px rgba(0,0,0,0.25)',
+  overflow: 'hidden',
+  transition: '0.6s all ease-out',
+});
+
+const Title = styled(Text)({
+  fontSize: 24,
+  fontWeight: 300,
+  textAlign: 'center',
+  color: colors.light50,
+  marginTop: 16,
+  marginBottom: 16,
+});
+
+const Item = styled(FlexRow)({
+  padding: 10,
+  alignItems: 'center',
+  borderTop: `1px solid ${colors.light10}`,
+});
+
+const ItemTitle = styled(Text)({
+  color: colors.light50,
+  fontSize: 14,
+  lineHeight: '20px',
+});
+
+const Bold = styled(Text)({
+  fontWeight: 600,
+});
+
+const Icon = styled(Glyph)({
+  marginRight: 11,
+  marginLeft: 6,
+});
+
+export default function LaunchScreen() {
+  return (
+    <Container>
+      <Welcome>
+        <Title>Hermes Debugger</Title>
+        <Item>
+          <Icon size={20} name="question-circle" color={colors.info} />
+          <FlexColumn>
+            <ItemTitle>
+              <Bold>Metro is connected but no Hermes apps were found.</Bold>{' '}
+              Open a React Native screen with Hermes enabled to connect. Note:
+              you may need to reload the app in order to reconnect the device to
+              Metro.
+            </ItemTitle>
+          </FlexColumn>
+        </Item>
+      </Welcome>
+    </Container>
+  );
+}
diff --git a/desktop/plugins/hermesdebuggerrn/SelectScreen.tsx b/desktop/plugins/hermesdebuggerrn/SelectScreen.tsx
new file mode 100644
index 000000000..102411d16
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/SelectScreen.tsx
@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import React from 'react';
+import {styled, FlexColumn, FlexRow, Text, Glyph, colors} from 'flipper';
+import {Target, Targets} from './index';
+
+const Container = styled(FlexColumn)({
+  height: '100%',
+  width: '100%',
+  justifyContent: 'center',
+  alignItems: 'center',
+  backgroundColor: colors.light02,
+});
+
+const Welcome = styled(FlexColumn)({
+  width: 460,
+  background: colors.white,
+  borderRadius: 10,
+  boxShadow: '0 1px 3px rgba(0,0,0,0.25)',
+  overflow: 'hidden',
+  transition: '0.6s all ease-out',
+});
+
+const Title = styled(Text)({
+  fontSize: 24,
+  fontWeight: 300,
+  textAlign: 'center',
+  color: colors.light50,
+  marginTop: 16,
+  marginBottom: 16,
+});
+
+const Item = styled(FlexRow)({
+  padding: 10,
+  alignItems: 'center',
+  borderTop: `1px solid ${colors.light10}`,
+});
+
+const ItemTitle = styled(Text)({
+  color: colors.light50,
+  fontSize: 14,
+  lineHeight: '20px',
+});
+
+const Icon = styled(Glyph)({
+  marginRight: 11,
+  marginLeft: 6,
+});
+
+type Props = {
+  readonly targets: Targets;
+  readonly onSelect: (target: Target) => void;
+};
+
+export default function SelectScreen(props: Props) {
+  return (
+    <Container>
+      <Welcome>
+        <Title>Hermes Debugger Select</Title>
+        <Item>
+          <FlexColumn>
+            <ItemTitle>Please select a target:</ItemTitle>
+          </FlexColumn>
+        </Item>
+        {props.targets.map((target) => {
+          return (
+            <Item onClick={() => props.onSelect(target)}>
+              <Icon size={20} name="code" color={colors.info} />
+              <FlexColumn>
+                <ItemTitle>{target.title}</ItemTitle>
+              </FlexColumn>
+            </Item>
+          );
+        })}
+      </Welcome>
+    </Container>
+  );
+}
diff --git a/desktop/plugins/hermesdebuggerrn/index.tsx b/desktop/plugins/hermesdebuggerrn/index.tsx
new file mode 100644
index 000000000..250cb3d80
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/index.tsx
@@ -0,0 +1,135 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import React from 'react';
+import {FlipperDevicePlugin, Device} from 'flipper';
+import LaunchScreen from './LaunchScreen';
+import SelectScreen from './SelectScreen';
+import ErrorScreen from './ErrorScreen';
+import ChromeDevTools from './ChromeDevTools';
+
+const POLL_SECS = 5 * 1000;
+const METRO_HOST = 'http://localhost:8081';
+
+export type Target = Readonly<{
+  id: string;
+  description: string;
+  title: string;
+  faviconUrl: string;
+  devtoolsFrontendUrl: string;
+  type: string;
+  webSocketDebuggerUrl: string;
+  vm: string;
+}>;
+
+export type Targets = ReadonlyArray<Target>;
+
+type State = Readonly<{
+  targets?: Targets | null;
+  selectedTarget?: Target | null;
+  error?: Error | null;
+}>;
+
+export default class extends FlipperDevicePlugin<State, any, any> {
+  static title = 'Hermes Debugger';
+  static id = 'Hermesdebuggerrn';
+  static icon = 'code';
+
+  static supportsDevice(device: Device) {
+    return !device.isArchived && device.os === 'Metro';
+  }
+
+  state: State = {
+    targets: null,
+    selectedTarget: null,
+    error: null,
+  };
+
+  poll?: NodeJS.Timeout;
+
+  componentDidMount() {
+    // This is a pretty basic polling mechnaism. We ask Metro every POLL_SECS what the
+    // current available targets are and only handle a few basic state transitions.
+    this.poll = setInterval(this.checkDebugTargets, POLL_SECS);
+    this.checkDebugTargets();
+  }
+
+  componentWillUnmount() {
+    if (this.poll) {
+      clearInterval(this.poll);
+    }
+  }
+
+  checkDebugTargets = () => {
+    fetch(`${METRO_HOST}/json`)
+      .then((res) => res.json())
+      .then(
+        (result) => {
+          // We only want to use the Chrome Reload targets.
+          const targets = result.filter(
+            (target: any) =>
+              target.title ===
+              'React Native Experimental (Improved Chrome Reloads)',
+          );
+
+          // Find the currently selected target.
+          // If the current selectedTarget isn't returned, clear it.
+          let currentlySelected = null;
+          if (this.state.selectedTarget != null) {
+            for (const target of result) {
+              if (
+                this.state.selectedTarget?.webSocketDebuggerUrl ===
+                target.webSocketDebuggerUrl
+              ) {
+                currentlySelected = this.state.selectedTarget;
+              }
+            }
+          }
+
+          // Auto-select the first target if there is one,
+          // but don't change the one that's already selected.
+          const selectedTarget =
+            currentlySelected == null && targets.length === 1
+              ? targets[0]
+              : currentlySelected;
+
+          this.setState({
+            error: null,
+            targets,
+            selectedTarget,
+          });
+        },
+        (error) => {
+          this.setState({
+            targets: null,
+            selectedTarget: null,
+            error,
+          });
+        },
+      );
+  };
+
+  handleSelect = (selectedTarget: Target) => this.setState({selectedTarget});
+
+  render() {
+    const {error, selectedTarget, targets} = this.state;
+
+    if (selectedTarget) {
+      return <ChromeDevTools url={selectedTarget.devtoolsFrontendUrl} />;
+    } else if (targets != null && targets.length === 0) {
+      return <LaunchScreen />;
+    } else if (targets != null && targets.length > 0) {
+      return <SelectScreen targets={targets} onSelect={this.handleSelect} />;
+    } else if (error != null) {
+      return <ErrorScreen error={error} />;
+    } else {
+      return null;
+    }
+  }
+}
diff --git a/desktop/plugins/hermesdebuggerrn/package.json b/desktop/plugins/hermesdebuggerrn/package.json
new file mode 100644
index 000000000..3c36f9a9f
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "flipper-plugin-hermesdebuggerrn",
+  "version": "1.0.0",
+  "main": "index.tsx",
+  "license": "MIT",
+  "title": "Hermes Debugger (RN)",
+  "icon": "apps",
+  "keywords": ["flipper-plugin"],
+  "bugs": {
+    "email": "rickhanlonii@fb.com"
+  }
+}
diff --git a/desktop/plugins/hermesdebuggerrn/yarn.lock b/desktop/plugins/hermesdebuggerrn/yarn.lock
new file mode 100644
index 000000000..fb57ccd13
--- /dev/null
+++ b/desktop/plugins/hermesdebuggerrn/yarn.lock
@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+