Using the debugger inside a devcontainer

Hi there,

I am trying to debug an issue inside my react app when using the Firefox browser. My app resides inside a devcontainer because my backend app is also residing there.

When I try to debug the issue and set a breakpoint the debugger stops apparently at the line. But the corresponding source file can't be open. This is kinda weird because when I use the Edge debugger extension for example everything is working fine. Also the path to file which can't be opened is valid inside the container. I checked that. The error message is:
`The editor could not be opened because the file was not found.`

This is my `launch.json`:
```json
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch frontend (yarn)",
"type": "node",
"request": "launch",
"runtimeExecutable": "yarn",
"cwd": "${workspaceFolder}/interface",
"runtimeArgs": ["start"],
"console": "integratedTerminal"
},
{
"type": "firefox",
"request": "launch",
"name": "Debug frontend in Firefox",
"url": "http://localhost:3000",
"webRoot": "${workspaceFolder}/interface/",
},
{
"type": "msedge",
"request": "launch",
"name": "Debug frontend in Edge",
"url": "http://localhost:3000",
"webRoot": "${workspaceFolder}/interface/",
}
]
}
```

I dug a little bit deeper and it seems that the debug extension is trying to open the file on my host environment which of course can't work because the layout is totally different. The Edge extension seem to open file inside the devcontainer just fine. Maybe the issue resides here?

Using vscode version: `1.83.1`
Firefox extension version: `v2.9.10`
Firefox version: `118.0.2`

Cheers
Daniel

提供された launch.json から始め、Firefox 構成を使用して devcontainer 内でブレークポイントの失敗を再現します。ソースファイルの扱いを動作する Edge 構成と比較し、解決されたパスがホストではなくコンテナー内で開かれることを確認します。完了の条件は、Firefox のデバッグで対応するソースファイルが開くことです。

索引モデルが issue の本文から書いたものです。