I'm not sure why there is this extension. It appears to be just a different way to start up Message for Web from Google. The service from Google works fine on Firefox when you are NOT in private browsing mode. When in private browsing mode the QR code will not populate so you can't start the service. This Extension was supposed to work in private mode too, but it did not work for me. When I restarted Firefox and launched the extension it just went to the Google page with the blank QR code. So, I am not sure what good the extension is in private mode, and since it opens a separate window apart from your tabs it is not nearly as convenient as the Google service. Too bad, I thought this would be better than the Google service.

Seems I have to re-sign in regularly even though I clicked remember this computer. When it's working it's good, even though I can't figure out how to switch text to mms on my laptop. Needs some work.