diff --git a/src/profile-logic/symbolication.ts b/src/profile-logic/symbolication.ts
index 3186fb7b3a..cdc01ac0d2 100644
--- a/src/profile-logic/symbolication.ts
+++ b/src/profile-logic/symbolication.ts
@@ -789,8 +789,8 @@ function _partiallyApplySymbolicationStep(
         if (funcIndex === undefined) {
           // Need a new func.
           funcIndex = funcTable.length;
-          funcTable.isJS[funcIndex] = false;
-          funcTable.relevantForJS[funcIndex] = false;
+          funcTable.isJS[funcIndex] = funcTable.isJS[oldFunc];
+          funcTable.relevantForJS[funcIndex] = funcTable.relevantForJS[oldFunc];
           funcTable.resource[funcIndex] = resourceIndex;
           funcTable.source[funcIndex] = null;
           funcTable.lineNumber[funcIndex] = null;
diff --git a/src/test/fixtures/example-symbol-table.ts b/src/test/fixtures/example-symbol-table.ts
index 509aa8d79b..40af714732 100644
--- a/src/test/fixtures/example-symbol-table.ts
+++ b/src/test/fixtures/example-symbol-table.ts
@@ -280,3 +280,45 @@ export const partialSymbolTable: ExampleSymbolTable = {
 
 export const completeSymbolTableAsTuple = completeSymbolTable.asTuple;
 export const partialSymbolTableAsTuple = partialSymbolTable.asTuple;
+
+// A symbol table for a JIT dump file (e.g. jit-52344.dump), simulating JS
+// functions symbolicated from samply + jitdump. The outer function
+// "renderButton.js" has an inlined call to "useState.js" at address 0x000a.
+const jitDumpSyms = [
+  {
+    address: 0,
+    name: 'renderButton.js',
+    file: 'Button.tsx',
+    lineRanges: [
+      {
+        startAddress: 0x0,
+        line: 42,
+      },
+      {
+        startAddress: 0x8,
+        line: 45,
+        inlinedCall: {
+          name: 'useState.js',
+          file: 'react.js',
+          lineRanges: [
+            {
+              startAddress: 0x8,
+              line: 100,
+            },
+          ],
+        },
+      },
+    ],
+  },
+  {
+    address: 0x2000,
+    name: 'runJobs.js',
+    file: 'scheduler.js',
+  },
+];
+
+export const jitDumpSymbolTable: ExampleSymbolTable = {
+  symbols: jitDumpSyms,
+  asTuple: _makeSymbolTableAsTuple(jitDumpSyms),
+  getAddressResult: _makeGetAddressResultFunction(jitDumpSyms),
+};
diff --git a/src/test/store/symbolication.test.ts b/src/test/store/symbolication.test.ts
index 372bdd5980..40c47f71ed 100644
--- a/src/test/store/symbolication.test.ts
+++ b/src/test/store/symbolication.test.ts
@@ -7,6 +7,7 @@ import { getProfileFromTextSamples } from '../fixtures/profiles/processed-profil
 import {
   completeSymbolTable,
   partialSymbolTable,
+  jitDumpSymbolTable,
 } from '../fixtures/example-symbol-table';
 import type { ExampleSymbolTable } from '../fixtures/example-symbol-table';
 import type { MarkerPayload } from 'firefox-profiler/types';
@@ -29,6 +30,7 @@ import { doSymbolicateProfile } from '../../actions/receive-profile';
 import {
   changeSelectedCallNode,
   changeExpandedCallNodes,
+  changeImplementationFilter,
 } from '../../actions/profile-view';
 import { formatTree, formatStack } from '../fixtures/utils';
 import { assertSetContainsOnly } from '../fixtures/custom-assertions';
@@ -44,18 +46,17 @@ import { SymbolsNotFoundError } from '../../profile-logic/errors';
  */
 describe('doSymbolicateProfile', function () {
   // Initialize a store, an unsymbolicated profile, and helper functions.
-  function init() {
+  function init(profile = _createUnsymbolicatedProfile()) {
     // The rejection in `requestSymbolsFromServer` outputs an error log, let's
     // silence it here. The fact that we call it is tested in
     // symbol-store.test.js.
     jest.spyOn(console, 'log').mockImplementation(() => {});
 
-    const profile = _createUnsymbolicatedProfile();
     const store = storeWithProfile(profile);
 
-    let symbolTable = completeSymbolTable;
+    let firefoxSymbolTable = completeSymbolTable;
     function switchSymbolTable(otherSymbolTable: ExampleSymbolTable) {
-      symbolTable = otherSymbolTable;
+      firefoxSymbolTable = otherSymbolTable;
     }
     let symbolicationProviderMode: 'from-server' | 'from-browser' =
       'from-browser';
@@ -67,12 +68,19 @@ describe('doSymbolicateProfile', function () {
       requestSymbolsFromServer: async (requests: LibSymbolicationRequest[]) =>
         requests.map<LibSymbolicationResponse>((request) => {
           const { lib, addresses } = request;
-          if (lib.debugName !== 'firefox.pdb') {
+
+          const symbolTables: Partial<Record<string, ExampleSymbolTable>> = {
+            'firefox.pdb': firefoxSymbolTable,
+            'jit-52344.dump': jitDumpSymbolTable,
+          };
+
+          const symbolTable = symbolTables[lib.debugName];
+          if (symbolTable === undefined) {
             return {
               type: 'ERROR' as const,
               request,
               error: new SymbolsNotFoundError(
-                'Should only have lib called firefox.pdb',
+                `Lib name ${lib.debugName} is not in the list of known names: ${Object.keys(symbolTables).join(', ')}`,
                 lib
               ),
             };
@@ -123,7 +131,7 @@ describe('doSymbolicateProfile', function () {
         }
         return readSymbolsFromSymbolTable(
           addresses,
-          symbolTable.asTuple,
+          firefoxSymbolTable.asTuple,
           (s: string) => s
         );
       },
@@ -478,6 +486,28 @@ describe('doSymbolicateProfile', function () {
     ]);
   });
 
+  it('inline frames for JS functions appear in the JS-only call tree after symbolication', async () => {
+    const {
+      store: { dispatch, getState },
+      profile,
+      symbolStore,
+      switchSymbolProviderMode,
+    } = init(_createUnsymbolicatedJitProfile());
+
+    switchSymbolProviderMode('from-server');
+
+    await doSymbolicateProfile(dispatch, profile, symbolStore);
+
+    // Check that the `useState.js` node shows up in the JS-only call tree.
+    // This function is an inline frame from the jitdump symbol info.
+    dispatch(changeImplementationFilter('js'));
+    expect(formatTree(getCallTree(getState()))).toEqual([
+      '- renderButton.js (total: 1, self: —)',
+      '  - useState.js (total: 1, self: 1)',
+      '- runJobs.js (total: 1, self: 1)',
+    ]);
+  });
+
   it('can re-symbolicate a partially-symbolicated profile even if it needs to add funcs to the funcTable', async () => {
     const {
       store: { dispatch, getState },
@@ -623,3 +653,11 @@ function _createUnsymbolicatedProfile() {
 
   return profile;
 }
+
+function _createUnsymbolicatedJitProfile() {
+  // See jitDumpSyms (in example-symbol-table.ts) for the corresponding symbols.
+  const { profile } = getProfileFromTextSamples(`
+    renderButton.js[lib:jit-52344.dump][address:a]  runJobs.js[lib:jit-52344.dump][address:2000]
+  `);
+  return profile;
+}