foo.diff

diff --git a/devtools/client/debugger/src/actions/navigation.js b/devtools/client/debugger/src/actions/navigation.js
index 1f8a0eb2e423..dd60da7c6794 100644
--- a/devtools/client/debugger/src/actions/navigation.js
+++ b/devtools/client/debugger/src/actions/navigation.js
@@ -48,14 +48,20 @@ export function willNavigate(event: Object) {
   };
 }
 
-export function connect(url: string, actor: string, canRewind: boolean) {
+export function connect(
+  url: string,
+  actor: string,
+  canRewind: boolean,
+  isWebExtension: boolean
+) {
   return async function({ dispatch }: ThunkArgs) {
     await dispatch(updateWorkers());
     dispatch(
       ({
         type: "CONNECT",
         mainThread: { url, actor, type: -1, name: "" },
-        canRewind
+        canRewind,
+        isWebExtension
       }: Action)
     );
   };
diff --git a/devtools/client/debugger/src/client/firefox.js b/devtools/client/debugger/src/client/firefox.js
index 5cbd6b0bba5d..e849a0fa0244 100644
--- a/devtools/client/debugger/src/client/firefox.js
+++ b/devtools/client/debugger/src/client/firefox.js
@@ -58,7 +58,8 @@ export async function onConnect(connection: any, actions: Object) {
   await actions.connect(
     tabTarget.url,
     threadClient.actor,
-    traits && traits.canRewind
+    traits && traits.canRewind,
+    tabTarget.isWebExtension
   );
   await actions.newGeneratedSources(sourceInfo);
 
diff --git a/devtools/client/debugger/src/reducers/debuggee.js b/devtools/client/debugger/src/reducers/debuggee.js
index 110ee943a147..6c66fc1954ce 100644
--- a/devtools/client/debugger/src/reducers/debuggee.js
+++ b/devtools/client/debugger/src/reducers/debuggee.js
@@ -20,13 +20,15 @@ import type { Action } from "../actions/types";
 
 export type DebuggeeState = {
   workers: WorkerList,
-  mainThread: MainThread
+  mainThread: MainThread,
+  isWebExtension: Boolean
 };
 
 export function initialDebuggeeState(): DebuggeeState {
   return {
     workers: [],
-    mainThread: { actor: "", url: "", type: -1, name: "" }
+    mainThread: { actor: "", url: "", type: -1, name: "" },
+    isWebExtension: false
   };
 }
 
@@ -38,7 +40,8 @@ export default function debuggee(
     case "CONNECT":
       return {
         ...state,
-        mainThread: { ...action.mainThread, name: L10N.getStr("mainThread") }
+        mainThread: { ...action.mainThread, name: L10N.getStr("mainThread") },
+        isWebExtension: action.isWebExtension
       };
     case "INSERT_WORKERS":
       return insertWorkers(state, action.workers);