fix launch.json

.vscode/launch.json

@@ -4,6 +4,17 @@
   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+    {
+      "type": "firefox",
+      "request": "attach",
+      "name": "Attach",
+      "pathMappings": [
+        {
+          "url": "webpack:///ext",
+          "path": "${workspaceFolder}/src/ext"
+        }
+      ]
+    },
     {
       "name": "Launch addon",
       "type": "firefox",
@@ -12,6 +23,12 @@
       "reAttach": true,
       "addonType": "webExtension",
       "addonPath": "${workspaceFolder}/dist-ff",
+      "pathMappings": [
+        {
+          "url": "webpack:///ext",
+          "path": "${workspaceFolder}/src/ext"
+        },
+      ]
     }
   ],
   "firefox": {