Just right. Rated 5 out of 5 stars

We regularly use it for "status display" screens for monitoring weather, road conditions, machinery etc - all kinds of noninteractive screens (think airplane departures display). The feature Ibanez mentions as a problem was actually what made us choose this. While a "live" page will refresh itself, imagine the server of the page displayed goes down. You're getting a "server is down" error screen and even as the server comes back online, the screen requires a serviceman to log in remotely and hit "refresh" in Firefox. With this, the page will reload and the screen will be back online all by itself.

This review is for a previous version of the add-on (0.4.1-signed).