Stuck on RootActorProxy: Received 0 tabs - will retry in 100ms

Hi!

I've switched to Macos, and in setting up my workflow again I'm running into some quirks with the Firefox debugger. It all works the _first_ time like it's intended to. But as soon as I close the debug window, I notice that on Linux the debugger would automatically quit as well. But now that's not the case. When I manually stop and start the debugger, no new Firefox window gets started, and in the logging I see this message repeated:

```
DEBUG|003.312|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.313|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.313|RootActorProxy: Received 0 tabs - will retry in 100ms
```

Larger log file

```
DEBUG|000.033|BreakpointsManager: Setting 2 breakpoints for /Users/smth.js
DEBUG|000.033|BreakpointsManager: Setting 1 breakpoints for /Users/smth.js
DEBUG|000.033|BreakpointsManager: Setting 1 breakpoints for /Users/smth.js
DEBUG|000.033|BreakpointsManager: Setting 1 breakpoints for /Users/smth.js
DEBUG|000.034|BreakpointsManager: Setting 1 breakpoints for /Users/smth.js
DEBUG|000.035|DebugConnection: Received response/event {"from":"root","applicationType":"browser","testConnectionPrefix":"server1.conn3.","traits":{"networkMonitor":true,"resources":{"extensions-backgroundscript-status":true},"supportsClearResources":true,"workerConsoleApiMessagesDispatchedToMainThread":true}}
DEBUG|000.035|RootActorProxy: Fetching root
DEBUG|000.035|DebugConnection: Sending request {"to":"root","type":"getRoot"}
DEBUG|000.037|DebugConnection: Received response/event {"preferenceActor":"server1.conn3.preferenceActor1","addonsActor":"server1.conn3.addonsActor2","deviceActor":"server1.conn3.deviceActor3","heapSnapshotFileActor":"server1.conn3.heapSnapshotFileActor4","perfActor":"server1.conn3.perfActor5","parentAccessibilityActor":"server1.conn3.parentAccessibilityActor6","screenshotActor":"server1.conn3.screenshotActor7","from":"root"}
DEBUG|000.037|RootActorProxy: Received root response
DEBUG|000.037|RootActorProxy: Fetching tabs
DEBUG|000.037|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.038|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.038|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.076|DataBreakpointsManager: Setting 0 data breakpoints
DEBUG|000.082|FirefoxDebugAdapter: Setting exception filters: []
DEBUG|000.085|FirefoxDebugAdapter: 0 threads
DEBUG|000.139|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.141|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.141|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.242|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.243|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.243|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.345|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.346|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.346|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.447|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.449|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.449|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.551|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.553|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.553|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.654|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.656|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.656|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.757|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.758|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.758|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.860|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.862|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.862|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|000.963|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|000.965|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |000.965|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.066|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.068|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.068|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.169|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.170|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.170|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.272|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.273|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.273|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.374|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.375|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.375|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.476|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.477|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.477|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.578|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.580|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.580|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.681|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.682|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.682|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.783|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.784|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.784|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.885|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.887|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.887|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|001.987|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|001.988|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |001.988|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.088|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.089|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.089|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.190|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.191|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.191|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.291|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.292|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.292|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.393|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.395|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.395|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.494|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.495|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.495|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.596|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.597|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.597|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.698|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.699|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.699|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.800|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.801|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.801|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|002.902|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|002.903|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |002.903|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.004|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.005|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.005|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.107|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.109|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.109|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.209|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.210|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.210|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.312|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.313|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.313|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.414|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.416|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.416|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.517|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.518|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.518|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.619|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.620|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.620|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.721|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.723|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.723|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.824|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.825|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.825|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|003.926|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|003.928|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |003.928|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.029|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.030|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.030|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.131|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.133|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.133|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.233|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.234|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.234|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.335|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.336|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.336|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.437|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.437|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.437|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.538|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.539|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.539|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.640|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.641|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.641|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.742|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.743|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.743|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.844|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.846|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.846|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|004.947|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|004.948|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |004.948|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.049|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.051|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.051|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.152|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.153|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.153|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.254|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.256|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.256|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.357|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.358|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.358|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.459|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.460|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.460|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.561|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.563|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.563|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.664|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.666|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.666|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.766|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.767|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.767|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.869|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.869|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.869|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|005.971|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|005.971|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |005.972|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.072|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.073|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.073|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.174|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.175|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.175|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.276|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.277|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.277|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.378|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.379|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.379|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.480|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.482|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.482|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.583|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.584|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.584|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.685|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.686|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.686|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.787|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.789|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.789|RootActorProxy: Received 0 tabs - will retry in 100ms
DEBUG|006.890|DebugConnection: Sending request {"to":"root","type":"listTabs"}
DEBUG|006.892|DebugConnection: Received response/event {"tabs":[],"from":"root"}
INFO |006.892|RootActorProxy: Received 0 tabs - will retry in 100ms
INFO |006.941|FirefoxDebugSession: Connection to Firefox closed - terminating debug session
DEBUG|006.993|DebugConnection: Sending request {"to":"root","type":"listTabs"}

```

Part of my launch.json

```
{
"name": "Launch new Debug Firefox",
"type": "firefox",
"request": "launch",
"reAttach": true,
"url": "https:///",
"webRoot": "${workspaceFolder:pwa}",
"profile": "default-debug",
"keepProfileChanges": true,
"pathMappings": [
{
"url": "webpack:////Users/",
"path": "/home/"
},
{
"url": "webpack:///",
"path": "${workspaceFolder:pwa}"
}
],
"log": {
"fileName": "${workspaceFolder:pwa}/ffdebug.log",
"fileLevel": {
"default": "Debug"
}
}
},
```

So far the only workaround I've found is rebooting the mac, which is a bit of a nuisance :)

Inizia dal percorso di retry RootActorProxy listTabs mostrato nei log, quindi riproduci il problema dopo aver chiuso e riavviato la finestra di debug di Firefox su macOS. Confronta il comportamento con Linux e traccia le richieste DebugConnection finché il debugger non esce oppure non avvia una nuova finestra di Firefox invece di rimanere in loop con zero schede.

Scritto dal modello di indicizzazione a partire dal testo della issue.