- Windows 8 contains two application environments, "Classic" and "Metro". Classic is very similar to the Windows 7 environment at this time, it requires a simple evolution of the current Firefox Windows product. Metro is an entirely new environment and requires a new Firefox front end and system integration points.
- The feature goal here is a new Gecko based browser built for and integrated with the Metro environment.
- Firefox on Metro, like all other Metro apps will be full screen, focused on touch interactions, and connected to the rest of the Metro environment through Windows 8 contracts.
- Firefox on Metro will bring all of the Gecko capabilities to this new environment and the assumption is that we'll be able to run as a Medium integrity app so we can access all of the win32 Firefox Gecko libraries avoiding a port to the new WinRT API for the bulk of our code. (Though we will need to have a pan and zoom capability for content.)
- We will need to determine if the Firefox front end on Metro will be built in XUL, C/C++, or HTML/CSS/JS (I'm assuming for now that .Net and XAML are off the table.)
- Firefox on Metro is a full-screen App with an Appbar that contains common navigation controls (back, reload, etc.,) the Awesomebar, and some form of tabs.
- Firefox will have to support three "snap" states -- full screen, ~1/6th screen and ~5/6th screen depending on how the user "docks" two full screen apps. Our UI will need to adjust to show the most relevant content for each size.
- In order to provide users with access to other content, other apps, and to Firefox from other content and apps, we'll need integration with the share contract, the search contract, the settings contract, the app to app picking contract, the print contract, the play to contract, and possibly a couple more. We'll be a source for some, a target for some, and both for some.
- We'll need to handle being suspended by the OS when out of view.
- We may want to offer a live tile with user-centric data like friends presence or other Firefox Home information updates
- Ideally we'd be able to create secondary tiles for Web-based apps hosted in Firefox's runtime.
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