--- a/devtools/client/framework/target.js
+++ b/devtools/client/framework/target.js
@@ -420,19 +420,17 @@ TabTarget.prototype = {
         this._remote.reject("Unable to attach to the console");
         return;
       }
       this.activeConsole = consoleClient;
       this._remote.resolve(null);
     };
 
     let attachConsole = () => {
-      this._client.attachConsole(this._form.consoleActor,
-                                 [ "NetworkActivity" ],
-                                 onConsoleAttached);
+      this._client.attachConsole(this._form.consoleActor, [], onConsoleAttached);
     };
 
     if (this.isLocalTab) {
       this._client.connect()
         .then(() => this._client.getTab({ tab: this.tab }))
         .then(response => {
           this._form = response.tab;
           this._url = this._form.url;

--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -410,16 +410,24 @@ Toolbox.prototype = {
       }, this._URL);
 
       // Optimization: fire up a few other things before waiting on
       // the iframe being ready (makes startup faster)
 
       // Load the toolbox-level actor fronts and utilities now
       yield this._target.makeRemote();
 
+      // Start tracking network activity on toolbox open for targets such as tabs.
+      // (Workers and potentially others don't manage the console client in the target.)
+      if (this._target.activeConsole) {
+        yield this._target.activeConsole.startListeners([
+          "NetworkActivity",
+        ]);
+      }
+
       // Attach the thread
       this._threadClient = yield attachThread(this);
       yield domReady.promise;
 
       this.isReady = true;
       let framesPromise = this._listFrames();
 
       Services.prefs.addObserver("devtools.cache.disabled", this._applyCacheSettings,