diff --git a/jest.config.js b/jest.config.js
index 8c1d760f..7c4cdf55 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -20,10 +20,10 @@ module.exports = {
   coveragePathIgnorePatterns: ['/node_modules/', '/mocks/', '/test/'],
   coverageThreshold: {
     global: {
-      branches: 58.12,
+      branches: 59.24,
       functions: 54.95,
-      lines: 60.61,
-      statements: 60.84,
+      lines: 60.91,
+      statements: 61.14,
     },
   },
   projects: [
diff --git a/src/extension-provider/createExternalExtensionProvider.test.ts b/src/extension-provider/createExternalExtensionProvider.test.ts
index 8156fda2..9693e5f0 100644
--- a/src/extension-provider/createExternalExtensionProvider.test.ts
+++ b/src/extension-provider/createExternalExtensionProvider.test.ts
@@ -4,6 +4,7 @@ import { StreamProvider } from '../StreamProvider';
 import { MockPort } from '../../test/mocks/MockPort';
 import messages from '../messages';
 import { createExternalExtensionProvider } from './createExternalExtensionProvider';
+import config from './external-extension-config.json';
 
 /**
  * A fully initialized extension provider, and additional mocks to help
@@ -126,6 +127,40 @@ describe('createExternalExtensionProvider', () => {
     expect(results).toBeInstanceOf(StreamProvider);
   });
 
+  it('supports Flask', () => {
+    // `global.chrome.runtime` mock setup by `jest-chrome` in `jest.setup.js`
+    (global.chrome.runtime.connect as any).mockImplementation(() => {
+      return new MockPort();
+    });
+    const results = createExternalExtensionProvider('flask');
+    expect(results).toBeInstanceOf(StreamProvider);
+    expect(global.chrome.runtime.connect).toHaveBeenCalledWith(
+      config.chromeIds.flask,
+    );
+  });
+
+  it('supports Beta', () => {
+    // `global.chrome.runtime` mock setup by `jest-chrome` in `jest.setup.js`
+    (global.chrome.runtime.connect as any).mockImplementation(() => {
+      return new MockPort();
+    });
+    const results = createExternalExtensionProvider('beta');
+    expect(results).toBeInstanceOf(StreamProvider);
+    expect(global.chrome.runtime.connect).toHaveBeenCalledWith(
+      config.chromeIds.beta,
+    );
+  });
+
+  it('supports custom extension ID', () => {
+    // `global.chrome.runtime` mock setup by `jest-chrome` in `jest.setup.js`
+    (global.chrome.runtime.connect as any).mockImplementation(() => {
+      return new MockPort();
+    });
+    const results = createExternalExtensionProvider('foobar');
+    expect(results).toBeInstanceOf(StreamProvider);
+    expect(global.chrome.runtime.connect).toHaveBeenCalledWith('foobar');
+  });
+
   describe('RPC warnings', () => {
     const warnings = [
       {
diff --git a/src/extension-provider/createExternalExtensionProvider.ts b/src/extension-provider/createExternalExtensionProvider.ts
index dce82ce6..d594fd8c 100644
--- a/src/extension-provider/createExternalExtensionProvider.ts
+++ b/src/extension-provider/createExternalExtensionProvider.ts
@@ -8,14 +8,16 @@ import config from './external-extension-config.json';
 
 const browser = detect();
 
-export function createExternalExtensionProvider() {
+export type ExtensionType = 'stable' | 'flask' | 'beta' | string;
+
+export function createExternalExtensionProvider(
+  typeOrId: ExtensionType = 'stable',
+) {
   let provider;
 
   try {
-    const currentMetaMaskId = getMetaMaskId();
-    const metamaskPort = chrome.runtime.connect(
-      currentMetaMaskId,
-    ) as Runtime.Port;
+    const extensionId = getExtensionId(typeOrId);
+    const metamaskPort = chrome.runtime.connect(extensionId) as Runtime.Port;
 
     const pluginStream = new PortStream(metamaskPort);
     provider = new StreamProvider(pluginStream, {
@@ -35,13 +37,8 @@ export function createExternalExtensionProvider() {
   return provider;
 }
 
-function getMetaMaskId() {
-  switch (browser?.name) {
-    case 'chrome':
-      return config.CHROME_ID;
-    case 'firefox':
-      return config.FIREFOX_ID;
-    default:
-      return config.CHROME_ID;
-  }
+function getExtensionId(typeOrId: ExtensionType) {
+  const ids =
+    browser?.name === 'firefox' ? config.firefoxIds : config.chromeIds;
+  return ids[typeOrId as keyof typeof ids] ?? typeOrId;
 }
diff --git a/src/extension-provider/external-extension-config.json b/src/extension-provider/external-extension-config.json
index e6c94246..c780400b 100644
--- a/src/extension-provider/external-extension-config.json
+++ b/src/extension-provider/external-extension-config.json
@@ -1,4 +1,12 @@
 {
-  "CHROME_ID": "nkbihfbeogaeaoehlefnkodbefgpgknn",
-  "FIREFOX_ID": "webextension@metamask.io"
+  "chromeIds": {
+    "stable": "nkbihfbeogaeaoehlefnkodbefgpgknn",
+    "beta": "pbbkamfgmaedccnfkmjcofcecjhfgldn",
+    "flask": "ljfoeinjpaedjfecbmggjgodbgkmjkjk"
+  },
+  "firefoxIds": {
+    "stable": "webextension@metamask.io",
+    "beta": "webextension-beta@metamask.io",
+    "flask": "webextension-flask@metamask.io"
+  }
 }