docs(plugin): describe workaround for save dialog bug

this adds a description on how to workaround the current chrome bug of having to reply to external messages from the IDE in order to properly continue with the save dialog callback

Related issue #607

Author: zewa666

docs/introduction/faq.md

@@ -62,3 +62,14 @@ __NOTE: If you already have the plugin installed (e.g., on the laptop you're try
 * [Download instructions for the required ".crx" installer](https://stackoverflow.com/questions/25480912/how-to-download-a-chrome-extension-without-installing-it)
 
 __NOTE: you can't obtain the ".crx" file directly from the Chrome store. Instead, you need to install it once locally, and then go to the installation directory on your machine to retrieve it.__
+
+### Why does no save dialog appear once a plugin is attached?
+Due to a current [Chrome bug](https://bugs.chromium.org/p/chromium/issues/detail?id=922373), if you don't reply to the emitted message from Selenium IDE, further processing won't happen. In order to workaround the issue, make sure to listen for the action `emit` with the entity `project` and reply with `true`:
+
+```javascript
+chrome.runtime.onMessageExternal.addListener((message, sender, sendResponse) => {
+  if (message.action === "emit" && message.entity === "project") {
+    sendResponse(true);
+  }
+});
+```