vscode-firefox-debug | VS Code Debug Adapter for Firefox | Code Inspection library

You can use this extension in launch or attach mode. In launch mode it will start an instance of Firefox navigated to the start page of your application and terminate it when you stop debugging. You can also set the reAttach option in your launch configuration to true, in this case Firefox won't be terminated at the end of your debugging session and the debugger will re-attach to it when you start the next debugging session - this is a lot faster than restarting Firefox every time. reAttach also works for WebExtension debugging: in this case, the WebExtension is (re-)installed as a temporary add-on. In attach mode the extension connects to a running instance of Firefox (which must be manually configured to allow remote debugging - see below). To configure these modes you must create a file .vscode/launch.json in the root directory of your project. You can do so manually or let VS Code create an example configuration for you by clicking the gear icon at the top of the Debug pane. Finally, if .vscode/launch.json already exists in your project, you can open it and add a configuration snippet to it using the "Add Configuration" button in the lower right corner of the editor.