docs: add authentication token instructions to extension README (#1207)

extension/README.md

@@ -45,4 +45,33 @@ Configure Playwright MCP server to connect to the browser using the extension by
 
 When the LLM interacts with the browser for the first time, it will load a page where you can select which browser tab the LLM will connect to. This allows you to control which specific page the AI assistant will interact with during the session.
 
+### Bypassing the Connection Approval Dialog
+
+By default, you'll need to approve each connection when the MCP server tries to connect to your browser. To bypass this approval dialog and allow automatic connections, you can use an authentication token.
+
+#### Using Your Unique Authentication Token
+
+1. After installing the extension, click on the extension icon or navigate to the extension's status page
+2. Copy the `PLAYWRIGHT_MCP_EXTENSION_TOKEN` value displayed in the extension UI
+3. Add it to your MCP server configuration:
+
+```json
+{
+  "mcpServers": {
+    "playwright-extension": {
+      "command": "npx",
+      "args": [
+        "@playwright/mcp@latest",
+        "--extension"
+      ],
+      "env": {
+        "PLAYWRIGHT_MCP_EXTENSION_TOKEN": "your-token-here"
+      }
+    }
+  }
+}
+```
+
+This token is unique to your browser profile and provides secure authentication between the MCP server and the extension. Once configured, you won't need to manually approve connections each time.
+