I've been using this for a few months and I love it. I will take this opportunity to gripe though and say that it doesn't handle DOM changes, e.g. if you're going through a form and you click an expander, the contents of that expander won't be translated if it was dynamically inserted into the DOM. This is more or less any AJAX request, or React/Vue component with its own data calls, etc. As a result, I often find myself falling back to Chrome if I need translations (recently moved abroad).
Also, it would be great if the models were cached. If I don't click "translate this tab automatically as I browse" I'll download the whole model on every page load. Not great if you're tethered to your phone :(