ALPHA
The Edget is an embedded widget. That is, it's an online application hosted on a different website than the one you were visiting.
The nice thing about this setup is that you can configure the Edget once, and it will behave the same no matter which site you're visiting. Yep, you got it right—set your preferences once, and they will apply on any site that uses the Edget! Pretty cool, huh?
But wait, it gets even better! If you register an edget.eu account, your preferences will be stored across sessions, browsers and computers. Here's how it works. If you don't have an account you can set your preferences for the current session. As soon as you register an account, your temporary preferences are copied to your profile. After that, every time you log in the profile preferences are activated automatically. And all changes you make while you're logged in are applied to the profile and will be restored the next time you log in.
The Edget works with pretty much all modern browsers, even some mobile browsers. It was successfully tested with Firefox, Internet Explorer, Safari, Opera, Chrome—even the Symbian browser on Nokia smartphones tested out ok.
The only real limitation is related to whether your browser implements W3C's Cross-Origin Resource Sharing draft specification—and even that only affects currency conversions. Currently the following browsers are known to support that specification: Firefox, Safari and Chrome.